compression

**RedMetal** · 02-18-2008, 06:23 PM

I hope I word this correctly.... I am a nitrous guy

so be patient LOL

I am running a cam only LS1.... see sig. I am interested in buying some Stage II LS6 heads that will retain the stock LS6 compression of 10.5-1. I just want to add a little more grunt/fun for the time being with my N/A setup.

Now the question, will I be able to get the compression down from 10.5-1 to atleast 9.5-1 with a forged 347 using the above mentioned heads?? I assume the CR could be lowered to 9.5 with just dished pistons. Am I crazy LOL? When I can afford it I would like to enter the FI world. My goals are modest, I would like to run (X)psi to reach 530-550rwhp.

Thanks

**cailey37** · 02-19-2008, 06:02 PM

Originally Posted by RedMetal

I hope I word this correctly.... I am a nitrous guy

so be patient LOL

I am running a cam only LS1.... see sig. I am interested in buying some Stage II LS6 heads that will retain the stock LS6 compression of 10.5-1. I just want to add a little more grunt/fun for the time being with my N/A setup.

Now the question, will I be able to get the compression down from 10.5-1 to atleast 9.5-1 with a forged 347 using the above mentioned heads?? I assume the CR could be lowered to 9.5 with just dished pistons. Am I crazy LOL? When I can afford it I would like to enter the FI world. My goals are modest, I would like to run (X)psi to reach 530-550rwhp.

Thanks

Do you happen to know what cc's the heads are???

**Frost** · 02-19-2008, 08:54 PM

64cc or less if milled. Yeah you can use a dish and get to 9.5:1.

**RedMetal** · 02-20-2008, 02:56 AM

yes, 64cc is how they come which is how I came up with 10.5-1 using the stock GM gaskets. Thanks Frost

**cailey37** · 02-20-2008, 05:58 PM

Originally Posted by RedMetal

yes, 64cc is how they come which is how I came up with 10.5-1 using the stock GM gaskets. Thanks Frost

With that I wouldn't get too crazy with the boost. Nothing really over 7-8 lbs....but hey....that's just me....you wouldn't be pushing it too bad and still have a little reliability.

**RedMetal** · 02-21-2008, 03:10 AM

Originally Posted by cailey37

With that I wouldn't get too crazy with the boost. Nothing really over 7-8 lbs....but hey....that's just me....you wouldn't be pushing it too bad and still have a little reliability.

Well, I wouldn't be running boost until the engine is forged and at that point I would use dished pistons to reach a more boost friendly 9.5-1 and would like to run 10-12 lbs.