pontiacfreak142 Posted February 23, 2011 Report Share Posted February 23, 2011 what kind of compression can i get away with on a 383 stroker with aluminim heads and without going a crazy overlap cam? I currently have 11.5 pistons and was told that would be fine to run 93 in with aluminum heads. Now a buddy is saying no way in hell. Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted February 23, 2011 Report Share Posted February 23, 2011 (edited) Depends. What style we talking? Old school? LT1? Even newer? EDIT - Here's a cool article. http://www.popularhotrodding.com/enginemasters/articles/hardcore/0606em_understanding_compression_ratio/index.html I ran 11.2:1 on 92 with no issues. Edited February 23, 2011 by nurkvinny Quote Link to comment Share on other sites More sharing options...
Nickey4271647545519 Posted February 23, 2011 Report Share Posted February 23, 2011 without going with crazy overlap, I'd say 10.5:1 is the max I would run. Quote Link to comment Share on other sites More sharing options...
nurkvinny Posted February 23, 2011 Report Share Posted February 23, 2011 11:1 with alum heads in no problem. OP - Please list as many of the specs you're running as you can. Quote Link to comment Share on other sites More sharing options...
Nickey4271647545519 Posted February 23, 2011 Report Share Posted February 23, 2011 11:1 with alum heads in no problem. OP - Please list as many of the specs you're running as you can. This is true. But you need a bigger cam to bleed to off some compression to run 11:1. And as the OP mentioned he doesnt want to run alot of duration. But I'll wait on cam specs to give my final opinion. Quote Link to comment Share on other sites More sharing options...
Cordell Posted February 23, 2011 Report Share Posted February 23, 2011 How do you buy parts and not have this figured out? You should be on the edge of what you can get away with, but this is also why a lot of people wouldn't push it. You just need to keep your dynamic compression from going overboard. I'd just be mindfull of cam selection and talk to people who are experienced in cam design, not your buddys, not some guy at Jeg's, and not the internet. Quote Link to comment Share on other sites More sharing options...
Patterson Posted February 23, 2011 Report Share Posted February 23, 2011 Running a cam with over 235' @.050 lift and a lobe seperation no narrower than 110 you should be okay. You won't have a ton of initial advance in it but you'll be okay. Quote Link to comment Share on other sites More sharing options...
pontiacfreak142 Posted February 23, 2011 Author Report Share Posted February 23, 2011 no cam as of yet, basically the motor is a gen 1 350 out of a 95 silverado, 383 crank, forged rods 11.48:1 hypereutectic pistons, the heads im going with are 64 cc 2.02 intake 1.60 exaust 190cc runner and are aluminum. i was planning on getting everything together before calling comp and getting there opinion on the cam. Scott, i did have it figured out for the most part, like i said i had several people telling me 11:5 would be fine as long as i had aluminum heads (got my info from a guy that claimed to be a "pro engine builder"). Not to mention its not a huge deal to me. would i like to have a a car that can run on 93, of course. But if it doesnt work out that way, i wont be heart broken or anything. just attempting to not have to pay $6.50 a gallon if at all possible lol Quote Link to comment Share on other sites More sharing options...
Patterson Posted February 23, 2011 Report Share Posted February 23, 2011 Is it gonna be carbd' or EFI? Quote Link to comment Share on other sites More sharing options...
pontiacfreak142 Posted February 23, 2011 Author Report Share Posted February 23, 2011 carbed Quote Link to comment Share on other sites More sharing options...
Patterson Posted February 23, 2011 Report Share Posted February 23, 2011 E85 that thing. Quote Link to comment Share on other sites More sharing options...
pontiacfreak142 Posted February 23, 2011 Author Report Share Posted February 23, 2011 that thought had crossed my mind. what all is required to run it? Quote Link to comment Share on other sites More sharing options...
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