01-05-2017, 12:27 PM | #1 |
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Mild 355 cam choice
Hello to all, so I have a mild mannered 355. Looking to get alot more low end to mid range torque out of it,plan on getting a set of 062 vortex heads to bump up compression, would like a lobe to the idle choppy like. But need the low end torque and to carry up to midrange. Back ground I have now is a 78 350 4 bolt main, torque plated 30 over and honed surfaced and line boerd. Stock crank turned 10/10 stock rods resized ends new ARP bolts. K B flat tops , rotating assembly balanced, old 327 350 HO cam, down fall 882 heads small valve fluxed surfaced mild port and polish machined for positive type seals and guides cut for extra lift, 3 angle valve job , single plain weiand intake , blue print n balanced distributor with HO coil , 1 5/8 long tube headers and a edelbrock 650 performer. So I have a strong lower end but top end needs improvement, any suggestions or thoughts would be great
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01-05-2017, 12:46 PM | #2 |
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Re: Mild 355 cam choice
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01-05-2017, 12:55 PM | #3 |
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Re: Mild 355 cam choice
Looks decent, but how well would it perform with the vortecs? Not a street car, can get a vacuum can for brakes ineeded. Was thinking of a thumper cam but from what I read. They don't hit the power band till mid range
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01-05-2017, 02:26 PM | #4 |
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Re: Mild 355 cam choice
I don't know a lot about cams but I never heard of a choppy cam with low end torque. One thing I do know is if I was going to use vortec heads I would either use brand new factory heads or after market heads. Used factory heads are prone to have cracks.
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01-05-2017, 02:37 PM | #5 |
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Re: Mild 355 cam choice
I agree my intentions are to buy a new set found them for 320 a piece assembled, alot cheaper then then boil flux surface and valve job. Race figure 8s choppy idle is more of a want than a need, ideal torque band 1200-6000 rpm, I may mill the new heads for more lift to open up my options
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01-05-2017, 02:59 PM | #6 |
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Re: Mild 355 cam choice
Not a bad idea to mill the valve bosses while the heads are off but if you are looking for low end torque you really don't need to. The vortec heads will add 30 to 40 hp over stock heads and with a mild cam it will have a lot of low end torque.
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01-05-2017, 03:08 PM | #7 |
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Re: Mild 355 cam choice
Previous motor was a 71 olds 455 rocket thing was a torque monster :-) didn't like rpms though. Through a ride through the block on #6 cylinder. I'd like to get my small block as close to that as pisdible
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01-05-2017, 08:41 PM | #8 |
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Re: Mild 355 cam choice
I use to love them 455s back in the day. I put one in a 1969 442 and it was a monster until the bearing let go, lol. It was an easy way to make a hotrod back then when they were plentiful. Take a 445 out of a big 4 door and drop it in a small body, slide it back until it hits the firewall find a driveshaft and instant hotrod.
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01-06-2017, 01:41 AM | #9 |
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Re: Mild 355 cam choice
Have a little porting done on the exhaust side of the vortecs and run a single pattern cam. They are very underrated by most that just follow the herd.
An Isky MegaCam with it's 108*LS is well suited to a 350 sbc and what you're wanting to achieve. You have a choice of ; 214*, 221*, or 232* @ .050 duration. The CompCams High Energy @ 212*, or 218*, or their Magnum @ 224*, or 230* are more choices . They will give up some to the Iskys , but have an advantage in other areas. $0.02
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01-06-2017, 12:01 PM | #10 |
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Re: Mild 355 cam choice
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01-06-2017, 08:19 PM | #11 |
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Re: Mild 355 cam choice
Wow not asking much of that little 355 are you.
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01-06-2017, 08:45 PM | #12 |
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Re: Mild 355 cam choice
Comp Xtreme energy by far best I ever ran in my s.b.
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01-07-2017, 07:41 AM | #13 |
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Re: Mild 355 cam choice
I thought the same !
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01-07-2017, 10:52 AM | #14 |
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Re: Mild 355 cam choice
I'd ditch that single plane intake & go dual also.
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01-07-2017, 04:27 PM | #15 |
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Re: Mild 355 cam choice
I think bosshog nailed it. Choppy idle, good torque, moderate lift for the Vortecs, and works on low compression.
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01-07-2017, 07:32 PM | #16 |
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Re: Mild 355 cam choice
I don't know, 2600-3000 cruise rpm, that seems a little high to me. I guess it would work if you are running a th350 with 373 or higher gears.
Last edited by garyd1961; 01-07-2017 at 07:37 PM. |
01-07-2017, 08:40 PM | #17 |
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Re: Mild 355 cam choice
I'm running th350, 3.08's and a 350 sbc, 28" tall tires (275/60/15) on my daily driver, which is a '65 Bel Air and on the highway I cruise 26-2700 to run 70.
The HO6 seemed to fit the bill given the parts Skoglund already has. Should be easy on parts too.
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01-07-2017, 11:18 PM | #18 | |
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Re: Mild 355 cam choice
Quote:
http://www.competitionproducts.com/E.../#.WHGvXfkrJPY
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01-08-2017, 02:28 PM | #19 | |
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Re: Mild 355 cam choice
Quote:
I have to agree it's a really good choice. I have pretty near the same set up as you in my 70 C10, 350 9.4:1compression, cam 414/428 hydraulic roller, th350 trans, 3.07 gears, 29 inch tires. stock converter, I can cruise at 55 but my truck likes to run around 70. At 55 it's a little sluggish but I compensate this by adjusting the kick down cable so if I need/want more power it will drop back down to second gear. My concern was big cams mean you need a big stall converter and big stall converters mean you need big gears in the rear. I see now this is not the case with this cam. Last edited by garyd1961; 01-08-2017 at 02:35 PM. |
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01-12-2017, 11:17 AM | #20 |
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Re: Mild 355 cam choice
Thanks for all of the replies, I have a set of heads on the way, going to tear em down and have em machined for 550 lift, and mild port polish on exhaust side. Swapping to the dual plane intake since I need a new one to bolt to the vortecs any how. With the 64 cc head guessing I will run between 9:5:1 to 10:1 CR . already run a blend of premium and av gas so no problem there. Th400 trans with shift kit 14 in tires with 2:73 gear. Swapping rear end out for a 8.5 10 bolt Chevy 4.10 gears and mini spool on the way. And yes it is alot to get out of a little 355 but with the right combination I have no doubt the car is about to have its fastest year yet :-)
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01-12-2017, 08:44 PM | #21 | ||
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Re: Mild 355 cam choice
To get TQ out of a SBC you need to spin it. That 455 made TQ at idle compared to what you have to spin a 350 at to make the same TQ.
Gary
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