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Author Topic:   cams question
rogracer2
Dirt Maniac

Total posts: 119
posted November 06, 2004 05:08 PM  
I'm trying to figure out what kind of hydraulic cam to put in my chevy 350 small block. I run mainly 1/4 mi medium banked tracks. The rules say I need to have a .450 total lift or 15 inches of vac at 1000 rpm. Is one better than the other? I am pretty clueless on cams!

[This message has been edited by rogracer2 (edited November 06, 2004).]

waltonjr1
Dirt Forum Champ
Total posts: 516
posted November 06, 2004 05:43 PM  
You can go up to .500 lift and get 15 at a 1000. a comp 12-242-2 would be a good cam for you with stock heads and a 2bbl intake.


rogracer2
Dirt Maniac

Total posts: 119
posted November 06, 2004 07:36 PM  
Does it matter that I have a 4 barrel?

iowatoolman
Dirt Freak

Total posts: 369
posted November 07, 2004 04:04 AM  
last year our rules said that we had to pull 15 inches of vacuum and we did it with a cam that was .567 roller and a 2bbl carb

drive hard or drive home

waltonjr1
Dirt Forum Champ
Total posts: 516
posted November 07, 2004 07:58 AM  
Did you do it legally? Doubt it.


waltonjr1
Dirt Forum Champ
Total posts: 516
posted November 07, 2004 08:01 AM  
Another thing, lobe seperation has alot to do with vaccum , you may be able to go a little over .500 with like a 112 lobe seperation.


sc1 racing
Dirt Freak

Total posts: 419
posted November 07, 2004 01:41 PM  
there is a roller cam that pull vacum, i run a bullet solid lift cam with .548 lift at 106 lobe sep, and it pulls 19 at 1,000, the roller is like a .532 and pulls 18, also reduces low rpm compression for those with a compression rule.

waltonjr1
Dirt Forum Champ
Total posts: 516
posted November 07, 2004 05:02 PM  
Wish I knew ya'll secret then b/c ive been dealing with vaccum rules for 5 years and cant run no where that big of cam with that little seperation and pull vaccum. Not calling you a liar but never seen it done.

[This message has been edited by waltonjr1 (edited November 07, 2004).]

streetstock82
Dirt Forum Racer

Total posts: 81
posted November 08, 2004 07:17 PM  
There are alot of things to take into cosideration when choosing a cam. You need to look at intake design, compression ratio, I'm assuming that you need a cast intake. You will be able to run a larger cam when using a smaller runner head and intake package. all things need to be examined to work. I run a 383
out of a friends late model that carries between 11-14 inches at idle and made 615 hp on the dyno. Hope this helps

iowatoolman
Dirt Freak

Total posts: 369
posted November 11, 2004 06:39 PM  
i did it very legally in my 406 this year i ran a custom roller that pulled 16cold @1000rpm 532 lift on a 110 degree sep in a 327 and kicked some booty with it
but i cannot give all my secrets away can i??? if you would like a custom vacuum roller cam pm me i have tryed all kinds of them to find out what works and what don't

drive hard or drive home

quote:
Originally posted by waltonjr1:
Did you do it legally? Doubt it.



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