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Topic Review (Newest First)
03-27-2016 12:37 PM
ChevelleSS_LS6 You should match the cam to the heads... what lift do the heads flow max cfm at? Add .050 and that's pretty much your max valve lift, to make life easier on the valvetrain.

Of course a roller cam, as they open and close the valve faster, would spend more time at/near max valve lift as well.

Keep in mind that your engine is a system, and the better all the parts work together, the better bang for the buck you'll get out of it.
04-20-2013 07:41 PM
El Rob Any one used the procomp heads yet. i have read a lot of good and bad. The bad seems to be small like valve covers not fitting right. I looked at them for some time at Skip White site.

Not trying to hijack you thread.
04-15-2013 11:30 PM
techinspector1 I'm getting some bad information from KB's site. Your SCR would be more like 9.55:1. I'm going to have to begin figuring this stuff myself instead of taking someone else's word for it.

Use a cam with intake duration somewhere between 205 and 220, with 212 as a middle ground.
04-15-2013 10:26 PM
fordss What cam should I use With that ratio ? I want to try to use my stock torque converter.The heads will only do as high as 550 lift . My car is 3300 lbs. Any help would be great
04-15-2013 01:36 PM
Originally Posted by fordss View Post
1991 chevy 350 with stock pistons I believe dish pistons going to put procomp 58cc heads on. What would the compression ratio be.
If we figure the dish at around 12cc's (trying to be real here), the static compression ratio using 58cc heads on a 350 would be 10.3:1.
04-15-2013 01:05 AM
68NovaSS Your earlier post has been merged with this one.
04-15-2013 12:38 AM
68NovaSS Just get the information the form asks for and it will calculate your c.r., if you have dish pistons, need to know the volume of the dish in cc's, how far the piston is down in the hole at TDC, typically .025", compressed gasket thickness, typically .041", etc.

We could guess at about 9.5:1, but...
04-14-2013 10:44 PM
fordss Ok I was thinking of do procomp 58cc head 210 flow I just don't know what my compression ratio be. I do not know how to do calculator tool on the web. It is 1991 chevy 350 if some one could tell what it would be great
04-14-2013 10:31 PM
fordss Sorry I'm not that smart I have no idea how do that
04-14-2013 09:41 PM
1Gary Plug in the numbers:

RSR Static Compression Ratio Calculator
04-14-2013 09:24 PM
what will my compression ratio be

1991 chevy 350 with stock pistons I believe dish pistons going to put procomp 58cc heads on. What would the compression ratio be.
04-14-2013 04:25 PM
DoubleVision You don't want to use 193 heads. These are TBI "Swirl Port" heads. They give a engine real good low end torque and fuel economy, but due to the swirl port, they run out of breath at 3000 RPM.
04-14-2013 12:52 AM
mikesnyhere I used a 270 adv duration with 9.1 to comp. ratio it worked really well on a ported 302 . I would hesitate to use it on anything less than 8.8 . what is recommended ? the 268 is a high energy Crane ? their recommended specs should tell you a recommended CR , and if new springs are needed . best to look at what the cam manufactures suggests .
04-13-2013 09:46 PM
fordss Sorry guys, l found what the chambers size was. I don't know how to delete the post, but since it's still on; could l put a 268 high energy cam in it with these heads? Thanks
04-13-2013 09:45 PM
eight90 They are 64 cc give or take a cc. Others have cc'd theirs here and I cc'd mine as well, just to make sure.
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