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Originally Posted by geezer#99
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The Vortec that I have is running a CSI cam. Great throttle response and pulls like a train. Chris is a great guy to deal with too. Just try and catch him before race season gets hot and heavy.
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Originally Posted by Captainfab
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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The '63 pulls hard off idle and drops off around 4k. I still need to get a live tune on the engine as I think the "start up" tune I have is leaving a lot on the table. Even with this mild tune, it goes real good.
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Originally Posted by weq92f
This is what I want to avoid. I want quick throttle response and loads of bottom end torque. The outgoing flat tappet cam was bone stock or so mild that it was very close to stock anyhow. My guess is that it was ground close to 112/114 LSA, probably .45 lift and conservative duration.
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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I know we are running different stroke / bore combos but Id give Chris a call. Im at a 109 LSA, port injected with slightly larger than stock injectors. It can sound a little choppy (I think) at times and comes off idle like a bat out of hell. Ill dig through my receipts and try and find the cam card and get you the lift / duration. Its a pretty mild sounding cam but I don't think Id want anything else for what Im doing with the truck.
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Originally Posted by funkatation
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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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
