just like the topics says.i know it has been discussed before but i couldn't find any good info for my compression ratio.anyway my compression is between 9.3:1 - 9.4:1.i am running a comps 08-503-8 cam.i am really not happy with it.i was thinking going a little bigger(its a roller cam).i will be switching from a tpi setup to a miniram.any suggestions you guys could give would be great.also i am running an acell dfi setup.here are my current cam specs:
intake: .503
exhaust: .510

intake duration:224
exhaust dur: 230
lobe sep 112

by the way i am running a t-56 trans.any help would be appreciated.......

 

Why are you unhappy with it?

What heads are on the car?

Have they been flow tested? If so, what did they flow?

What intake is on the motor now?

If you don't have the right combination of parts to compliment each other it's going to run like crap. That's a lot of cam for a TPI setup especially if it's still stock. Also a lot of cam for a set of stock heads.

 

sorry about that.the heads are afr 195's.the intake is a tpi with an acell base slp runners and ported plenum 58mm tb 30lb injectors.

 

stock afr's? CNC'd? Any valve job or are they just as they came out of the box? What makes you unhappy with it?

 

they are stock afr heads.just doesn't seem to have the torque i was looking for.do u have any other cam that would work for my combo?

 

Your CR is a little low for that cam and AL heads.

You might try a vette MT chip SA setup in your chip.
Some vette chips have a few things swapped around so you can't just swap them.
Or you could swap to a slightly smaller cam.
My guess is you chip is off by a good amount.

 

thanks for the reply but i don't have a chip.i am running accel dfi.

 

Well the cam isn't exactly perfect for a TPI setup especially LTR's. Your biggest problem most likely lies in the tune. Get it on the dyno with someone who knows what they're doing and it ought to run much better. My favorite cam for a LTR setup was always the Lingenfelter 219/219. There's guys on the forums here "claiming" 430-440 @ the wheels but I'm sceptical of that but the cam does make good power.

 

i would think that with that cam you'd be wanting more hp, not more torque. that should be very torquey with your setup. what kind of afr are you running (wideband?). what is your timing curve set to??? with that cam i'd be betting tuning is the issue, not the cam. that is unless someone made the mistake and retarded the cam when the installed it.

 

Your compression is way too low. Lingenfelter runs 11:1 with the 219 cam and aluminum heads. I ran 10.8:1 with my 219 cam and it couldn't hook up down low with drag radials.

I am assuming you are either running a deep dish(-18 or -22cc) or have a large chamber(74cc)?

You need to get the heads milled to get your compression to at least 10.5:1. Your dynamic compression is too low, and you need to raise your static compression ratio to bring it back up.

 

No, he'd have to remove too much from the heads to get the CR where it needs to be. The pistons are either too far in the hole or he's got a good sized dish. Only way to do it right would be to get a flat top piston and have the block zero decked.

 

pstons are flat tops with a 7cc relief. the heads are 74cc afr's.when i talked to comp cams thet said my compression is fine.the pistons are .025 in the hole.so its a stock drck height.thanks for the reply's guys....

 

What head gasket are you using? My calculations put you at 9.3:1. Way too low.

I would have the heads milled to 62cc, then use the fel-pro or gm .015 gasket which is .015 compressed. That will get you to .040 quench with the .025 deck height. That will put you at 11.1:1 static compression.

My afr heads started out at 76cc and are 58cc now. You will have to get them angle milled and have the intake corrected also.

 

so then u think the cam is good ?leave that alone and do the heads?

 

Your cam is fine, put some 1.6 roller rockers on it and fix the heads.

 

thanks for all of the help guys.i will be milling the heads....

 

YOU must raise the compression to 11:0 to 1 i have a great cam for u i just took it out of my motor went to a solid roller
i have the same heads as you with 383 sbc and a accel gen 7
but here are the specs 050 233in 246 ex lift .576 in .591 ex on a 111.9 ls this cam went 11.61 at 115 a full 3500 pound iroc.