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01-17-2018, 09:50 PM | #1 |
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bbc retrofit roller update
Doing a cam swap on my BBC. Would like to get you all's opinion on the combination of parts...
BBC 1970 402 4-bolt block bored out .030 over ( .060 over 396 ) stock stroke piston dome at 10 to 15cc piston deck meets block deck at zero #063 Cast Iron heads, stock valves, 102cc combustion chambers ( may mill a bit ) will be adding long tube headers, 2 3/4 inch tubes dual plane Edel Performer II+ intake 1000 CFM MSD EFI TBI will be adding a 1" carb spacer 700r/1800 stall/3.73 posi compression is between 9:1 and 9.5:1 The cam we have chosen is the Comp xr276hr ( 224/239 Dur @.050, 110 LSA, 1900-5600 RPM: 410HP@5000, 467TQ@4000 ). A close second was the comp xr270hr. With this update, I'm looking for a gain in off the line performance ( may need more stall ) and mid range torque. Fire away please. No parts have been purchased yet, well except for the rocker arms -klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
01-17-2018, 11:33 PM | #2 |
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Re: bbc retrofit roller update
Maybe you should call Chris and see what he recommends.
http://www.straubtechnologies.com/ |
01-18-2018, 08:11 AM | #3 |
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Re: bbc retrofit roller update
That’s a big cam for a small motor. Doubt you will have anything down low...
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01-18-2018, 01:55 PM | #4 | |
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Re: bbc retrofit roller update
Quote:
What would you recommend as an alternative, better cam for this pile of parts? thanks, -klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
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01-18-2018, 02:52 PM | #5 |
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Re: bbc retrofit roller update
I should retract my statement as i don’t have really any experience with roller cams. I saw the 276 part, I had 274 or something similar flat tappet in a 468 and was a pretty nasty cam. So be even more so in a smaller motor.
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01-18-2018, 03:39 PM | #6 |
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Re: bbc retrofit roller update
It’s not always the duration that makes the cam nasty.
Wider lsa’s Will make it less lumpy. Try a cam with 112 or 114 lsa in the smaller bbc. An example of nasty idle is those created by the infamous thumper and motherthumpr cams which typically run lsa’s of 106 to 108 degrees. |
01-18-2018, 06:27 PM | #7 |
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Re: bbc retrofit roller update
Take a look at the Lunati series of cams. They have a good selection of various profiles that should work well for you and reasonably priced as well.
I put a 60211 roller in mine and it is working well. However, make sure you know all your specs. I gave my builder the wrong gear ratio (was told it was a 3.73 without verifying) and after the engine was built and installed, we discovered it was a 3.07 with a limited slip. My cam doesn't wake up until 2500 or more so what I am dealing with is an ok launch to highway speed, but an engine that wants to really go once I am at highway cruising speed... not exactly what I wanted, not the builders fault, but I will be changing the cam to one of the Lunati rollers that wake up at a much lower RPM. I am not going to change the rear end gears anytime soon as I love the 2600rpm at 70mph.
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01-19-2018, 12:38 AM | #8 |
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Re: bbc retrofit roller update
IMO that is too big of a cam for a street driven 402, especially with EFI. I doubt that you will ever get it to run right with that big of a cam with a 110* LSA. I don't know what cam you have now, but that cam will not give you good low end to mid range power. More like mid range to top end.
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01-19-2018, 09:51 AM | #9 |
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Re: bbc retrofit roller update
I am not going FI on mine, but I just put together a pair of 427’s. First one I ran the Comp XN273hr which is 224/236@ .050 113 LSA and the second is the XM284hr which is 230/236 @ .050 112 LSA. I wanted extra exhaust duration to try and improve power through iron manifolds.
I know the marine cam is WAY too big for your motor, but for FI consider running the Comp smallest marine hr or the dedicated fi cam they offer. Both the xm and nX series have wider LSA which will help FI. Marine cams in general are easier on valve springs and designed for a smooth idle.
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01-19-2018, 01:31 PM | #10 | |
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Re: bbc retrofit roller update
Quote:
What do you guys think of the xr270hr ( 218/224 Dur @.050, 110 LSA, 1600-5400 RPM: 383HP@5000, 453TQ@4000 ) with respect to my goals? Note the same RPM peaks for HP/TQ as the 276 cam. The HP/TQ graph provided by COMP for these two cams both spin out 350 lbs of TQ at 1500 rpm. Is that just marketing or am I missing something? Now I'm confused! -klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
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01-19-2018, 08:52 PM | #11 |
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Re: bbc retrofit roller update
The Comp TBI 266HR roller is 1000-5000 rpm 210/220 on 113 degree lsa. I would think using similar numbers would be good. Does the injection company make a cam recommendation? If so, I'd run that...
The smallest marine cam is the same lobe patterns as your cam you referenced above,218/224, but it's on 112 deg LSA. 1600-5400 there rpm range. That's by far as big as I would go I think and no narrower than 112.
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01-19-2018, 09:50 PM | #12 |
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Re: bbc retrofit roller update
My EFI supplier ( MSD ) accepts LSA down to ( and maybe below ) 108 and durations out to 250. At least in the docco.
Quote: "Camshaft Selection There are three selections; Street/Stock, Mild and Performance. Select the cam that best suits your application. Camshaft Selection NOTE: If lobe separation angle (LSA) is less than 108° you may need to go to the next larger cam profile. If cam duration is longer than 250° the Atomic EFI will not be suitable for your application." I'm now leaning more toward the 270 roller cam. -klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
01-20-2018, 11:42 PM | #13 |
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Re: bbc retrofit roller update
Just be weary of the lifters you get. Mine were rebranded morels, and they sounded like a sewing machine. Kept getting all kinds of weird answers for fixes and they never quieted down. It drove me crazy I pulled the cam and lifters out and went with Isky.
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01-21-2018, 05:19 PM | #14 | |||
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Re: bbc retrofit roller update
Quote:
Quote:
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I have the Morels as well. They do make noise. My "guess" is that it's the tie bar between the lifters. The original lifters were very quiet but they had the dog bone alignment bars that were not attached to the lifters. The noise initially bothered me but Ive gotten used to it. Could be the Comp Magnum roller tips too. Sounds like the solids on my Singer .....I mean Shovelhead
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01-21-2018, 06:26 PM | #15 |
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Re: bbc retrofit roller update
I'll be using COMP 854-16 roller lifters ( part of their full roller kit ).
I'v read so many accounts of noise related to these XE/XR ( roller ) cam kits. My machine shop warned me of some noise from the lifter "arms" that attach pairs of them to keep the roller tips properly aligned with the cam lobes. This is something I'm willing to accept for the benefits of the roller. I don't want the dreaded sewing machine clatter that has been reported. If the geometry of the valve train is correct, all the components are correct, clearances are proper and it's all installed right, there's no reason for the rest of the components to make any more noise than a non-roller setup. That is, aside from the harder/faster action of the valves. In many cases, these online forum discussions of noisy retrofit roller setups were resolved by a combination of proper lash adjustment ( sometimes a full turn after 0 lash, sometimes only a quarter turn ), run time and/or faulty lifters/rockers. Most of the discussions were from earlier times like circa 2006 through 2010 for example. Another thing I noticed was that most of the excessive noise Extreme Energy threads I looked through ( random sample from google ) were on small blocks. May not even matter. -klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
01-21-2018, 09:13 PM | #16 |
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Re: bbc retrofit roller update
Mine were installed last year and it drove me nuts. I was told the lash, the weight of the oil, it needed more miles. None of it fixed it. Hydraulic rollers are supposed to be quieter than flat tappets. I haven’t run the engine with the new lifters (they are Johnson ones) but I think a lot of it had to do with how the bbc oiling system works. These Johnson ones are said to do better with less oil. I was told to run lighter oil with the morels, which went against my engine builders recommendations for the rest of the engine.
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01-24-2018, 12:53 PM | #17 |
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Re: bbc retrofit roller update
I'm committed now. The expensive bits have been ordered ( xr270hr along with the comp recommended lifters, springs and a set of pro magnum roller rockers ).
-klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
02-15-2018, 02:23 PM | #18 |
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Re: bbc retrofit roller update
Had to lean the grill out about an inch and a half to get the cam out!
Before that, I discovered that a PO had tapped out one of the front main pulley bolts to 7/16 ( the next larger size ). That ended up costing me about 100 bucks because I had to modify the puller I borrowed from AutoZone ( 30 bucks ) and purchase a new balancer ( 70 bucks ) because there's just no way I'm putting the F'd up one back on there! The front cam bearing looks a bit worn but I'm going to assemble the top end back together without replacing the bearings and hope for the best! If I have problems, guess I'll have to pull the block out and freshen it as well then. -klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
02-18-2018, 09:46 PM | #19 |
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Re: bbc retrofit roller update
Looking forward to hearing how it runs! That should be a good cam for your combo I think.
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06-15-2018, 01:27 PM | #20 |
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Re: bbc retrofit roller update
Life threw me a curve ball about mid January so I've put all this on hold for a while. Back on it not though. Got the block all cleaned up and ready for assembly.
-klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
09-26-2018, 04:52 PM | #21 |
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Re: bbc retrofit roller update
How do you like the 402/700r4 and 3.73 combo?
I have a mild 402/4l80e and a 3.08 that Im considering going to another gear. You think the 1800 stall is right for you? Build looks nice btw.
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09-26-2018, 07:43 PM | #22 |
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Re: bbc retrofit roller update
It is the right combo for me in terms of off-the-line gear and highway cruising. The stall I have is not enough. This cam update has done a lot in the way of improving this truck. I'm still tuning so can't really update fully on the cam update and what it has done to this engine, but the BBC=>700r=>3.73 definitely makes for a great combination IMO.
EDIT: It's not all roses. IMO the weak point of the 700r is the gear ratio jump between 1st and 2nd... ... for comparison have a look at this little chart showing gear ratios for popular transmissions. Note the 700 ... has a 1.44 difference between 1st and 2nd gear where the 350 and 400 have only 1.0. Trans.....gear ratios 1/2/3/4/.. 700r4.....3.06/1.62/1.00/0.68 th400.....2.48/1.48/1.00 th350.....2.52/1.52/1.00 powrg.....1.76/1.00 and for fun... 6L80E.....4.03/2.36/1.53/1.15/0.85/0.67 8L90E.....4.56/2.97/2.08/1.69/1.27/1.00/0.85/0.65 10LXX.....4.70/2.99/2.15/1.80/1.52/1.28/1.00/0.85/0.69/0.64 Hth, -klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold Last edited by weq92f; 09-26-2018 at 11:00 PM. |
09-26-2018, 09:34 PM | #23 |
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Re: bbc retrofit roller update
.
Drove the truck open headers and with no O2 sensor to the exhaust shop on Tuesday morning. It was about a 6 mile trip on two lane black top back roads, across and onto one main 6 lane for a bit to the shop. The truck made it all the way there but it was super loud and just a choppy slow drive. I was worried about so many things including, because I couldn't hear it, the valve train flying apart because it was mal- adjusted! Pulled up there just fine though and had the shop install the 02 bung in the appropriate spot, reduce the 3" flanges to my 2.5" pipes and install an H pipe behind that. With that, I was able to hear that I've got one, maybe two tapping rockers that ~may~ need attention. Maybe, but overall that initial adjustment was pretty good! Also very apparent was a massive single cylinder exhaust leak at the head on the passenger side. Unfortunately something else became immediately obvious, somewhere near the front of the engine a noise indicated contact of a worrisome sort. The sound was cyclic as if spinning and encountering more, then less 'resistance' over and over again and varying with engine RPM. High pitch and scratchy sort of grinding sound. Slow and easy drive back to the shop... Tried to pinpoint the sound using a couple tricks but was not successful so I removed the belt and fired it up....bamb! the sound is gone!!! I was real worried that my button troubles were about to come back, I was going to find that the sound was the cam sprocket eating the block. Only thing I can find that has any sound at all when I spin it is the water pump so I'm going to swap that out tomorrow and we shall see. The idler, tensioner, alt and ps pump seem OK to me. -klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
09-27-2018, 03:55 PM | #24 | |
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Re: bbc retrofit roller update
Quote:
I haven't put many miles on my build yet but the 3.08 and the 2.48 first gear makes for a long time before getting into second. Itll still bark the tires pretty nice though going into 2nd.
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09-28-2018, 11:45 PM | #25 |
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Re: bbc retrofit roller update
.
It wasn't the water pump. It wasn't the tensioner pulley. So... only thing left was the idler. Replaced it and I was golden... until...( see below ). I've now driven probably 150 to 250 miles under all sorts of roadway conditions in very mild weather. Today was the big voyage across the proverbial sea as I drove full A/C, windows up in traffic to the big show over at TMS in Ft. Worth put on by Good Guys Rod and Custom Association. Made it there with out any issue ( got some tappet noise and mayb a slight exhaust leak still and definitely and oil 'seepage' thing going on ). Along the way, I watched the dash gauge show less than 13 volts and over 200 temp when both the A/C fan and the radiator fans were on. This was while idling in stop and stop traffic. This is when the A/C performance starts to wane and the heat soak begins to take its toll. I've run the system to this point in test and observed 13.6 volts at the alternator and 13.3 volts at the battery all while the dash gauge was indicating less than 13 volts. Sp I was confident the system was still above 13 even though my gauge was not! Without issue we made it through the registration process and ventured out onto the grounds at TMS, cruised around the area once, parked and sat down for a nice cold beverage. Noticed a bunch of square bodies! Noticed a bunch of 67-72! Goin' back tomorrow! On the way home I got hit from behind. http://67-72chevytrucks.com/vboard/s...90#post8353490 It is not so bad I can't drive it, but it looks like crap! Going back to the show tomorrow anyway! EDIT: After I left the scene of the fender-bender ( bumper-bender, tailgate muncher ), the noise returned briefly. It was the same squeaky noise as before but only for a very short while, then it was gone again. So... not the idler either eh... -klb
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold Last edited by weq92f; 09-28-2018 at 11:52 PM. |
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