I have a built 383 stroker shortblock in my garage and it has -31cc dish pistons which is 8.5 to 1 with my 64cc Vortec heads and if I want 9.0 to 1 I will need to mill the heads so my chambers are 57cc as the thinnest headgasket I can run is .039 as my deck height is .005

I am running a Vortech V1-S-trim blower at 10psi max...down the road I plan on running a V1-T-trim at 15psi...this is through a 7.3L turbo diesel "huge" intercooler up front I was running 14.1@95.5mph with the old 350 engine with 130K miles on it at 8psi of boost (had stock internals at 9.4 to 1 compression)

This is in my GMC K1500 4x4 truck 5300 lbs with me in it.

How much difference in power will .5 compression make on the low end? Can anyone plug these numbers in a computer dyno software and let me know?

Cam is a Crower 214/220 476/496 114
Thorley Headers 1 5/8 w/high flow exhaust system.
80mm bbk tbi
Mildly ported vortec heads with 1.5 crane roller rockers.

BTW it has a built 4L60E trans with a 2500 stall TC boost is about 4psi at 2500rpms, shifts at 5300 rpms with 3.73 gears rimmomg 31" tall C rated tires on light weight 15" weld rims (60 lbs total)

Thanks for any help or suggestions guys!

Ken

 

Yes, I ran 8.3:1 for a while with my turbo system on the car..
I don't think you are really going to notice .5 increase in compression. It might work out to 10 hp maybe... the throttle response won't be anything of note either but hey if you want some thinner gaskets Summit has another source company... "something machine?" (d@mn, cant remember) that makes gaskets. I have a set of them that are .20 right now to help up my Cr.. I'll try and remember who they are and post it for you.
Later,
STEW

 

8 to 1 here

 

Just this post out I started on the PA forum...no way!

http://www.pacific-audio.com/perform...es/212972.html

Ken

 

I believe Rich Krause is running 8.5:1 in his car. If Rich is doing it, it can't be wrong

I will be running 8.5:1 or slightly lower in my car as well.

 

I've been running 8.3:1 n/a with the blower not installed for months and it is fine daily driving it. I dont think id even notice .5 difrence.