want more compression, mill heads??
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From: Someone owes me 10,000 posts
Car: 99 Formula
Engine: LS1
Transmission: T56
Axle/Gears: 342
Originally posted by 87Formula4bbl
Thanks F-Bird88, that helps a lot! You probly just laugh at how dumb people like me are sometimes, but I guess everyone has to learn at some point right? HAHA
Thanks F-Bird88, that helps a lot! You probly just laugh at how dumb people like me are sometimes, but I guess everyone has to learn at some point right? HAHA
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From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
The only really dumb question is the one ya don't bother asking.
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From: SW Michigan
Mark A Shields: ok with some help from this site and my dad i think i have the numbers to figure it out.
head cumbustion chamber: 76cc
bore: 4.040"
stroke: 3.48"
gasket thickness: .040"
piston dish volume: 13cc
deck clearance @ TDC: .30"
head gasket volume: 9.1cc
head cumbustion chamber: 76cc
bore: 4.040"
stroke: 3.48"
gasket thickness: .040"
piston dish volume: 13cc
deck clearance @ TDC: .30"
head gasket volume: 9.1cc
Supreme Member
Joined: Jan 2001
Posts: 7,164
Likes: 1
From: Someone owes me 10,000 posts
Car: 99 Formula
Engine: LS1
Transmission: T56
Axle/Gears: 342
Originally posted by pskel350
Mark A Shields: ok with some help from this site and my dad i think i have the numbers to figure it out.
head cumbustion chamber: 76cc
bore: 4.040"
stroke: 3.48"
gasket thickness: .040"
piston dish volume: 13cc
deck clearance @ TDC: .30"
head gasket volume: 9.1cc
Mark A Shields: ok with some help from this site and my dad i think i have the numbers to figure it out.
head cumbustion chamber: 76cc
bore: 4.040"
stroke: 3.48"
gasket thickness: .040"
piston dish volume: 13cc
deck clearance @ TDC: .30"
head gasket volume: 9.1cc
here's a screen shot for ya.
Supreme Member
Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Originally posted by pskel350
Mark A Shields: ok with some help from this site and my dad i think i have the numbers to figure it out.
head cumbustion chamber: 76cc
bore: 4.040"
stroke: 3.48"
gasket thickness: .040"
piston dish volume: 13cc
deck clearance @ TDC: .30"
head gasket volume: 9.1cc
Mark A Shields: ok with some help from this site and my dad i think i have the numbers to figure it out.
head cumbustion chamber: 76cc
bore: 4.040"
stroke: 3.48"
gasket thickness: .040"
piston dish volume: 13cc
deck clearance @ TDC: .30"
head gasket volume: 9.1cc
On that Program if yu just enter the gasket thickness
.040" the cr is overstated because the gasket is actually bigger than the bore size. 4.166 to 4.04
I enter .0425 instead of .040" to compensate
This represents the true gasket volime of 9.1cc's
Last edited by F-BIRD'88; Nov 12, 2002 at 07:14 PM.
Supreme Member
Joined: Jan 2001
Posts: 7,164
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From: Someone owes me 10,000 posts
Car: 99 Formula
Engine: LS1
Transmission: T56
Axle/Gears: 342
Originally posted by F-BIRD'88
Based on that I get 8.00:1
On that Program if yu just enter the gasket thickness
.040" the cr is overstated because the gasket is actually bigger than the bore size. 4.166 to 4.04
I enter .0425 instead of .040" to compensate
This represents the true gasket volime of 9.1cc's
Based on that I get 8.00:1
On that Program if yu just enter the gasket thickness
.040" the cr is overstated because the gasket is actually bigger than the bore size. 4.166 to 4.04
I enter .0425 instead of .040" to compensate
This represents the true gasket volime of 9.1cc's
oh, fooey on you.
Supreme Member
Joined: Sep 2001
Posts: 6,111
Likes: 53
From: Ontario, Canada
Car: 1988 Firebird S/E
Engine: 406Ci Vortec SBC
Transmission: TH-350/3500stall
Axle/Gears: 7.5" Auburn 4.10 Posi-Traction
Originally posted by Mark A Shields
oh, fooey on you.
oh, fooey on you.
so what do ya get with some smooth 58cc home/ ported heads ?
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From: SW Michigan
ok based on that, i think my compression is somewhere between 8 and 8.5:1, prolly closer to 8 i think. so i think a set of 58cc heads will get me up closer to 9.5:1 i think, should give some performance. so do you guys thnk im right??
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From: phila pa
Originally posted by 87Formula4bbl
. Can you tell me where to find the casting numbers?
Concerning compression, if my original set are the 416's, will the 081's set my compression a little higher, I think I read in my Haynes manual that I too have 8.5:1 right now, and I'd like to go a little higher eventually, so I'm keeping tuned to this thread.
Thanks for any help.
. Can you tell me where to find the casting numbers?
Concerning compression, if my original set are the 416's, will the 081's set my compression a little higher, I think I read in my Haynes manual that I too have 8.5:1 right now, and I'd like to go a little higher eventually, so I'm keeping tuned to this thread.
Thanks for any help.
305 (LG4 & LB9) 10159553 58cc 1.84" 1.5"
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