Flat top pistons 6.0 4.030 build compression
08-19-2018, 11:16 AM
#1
Flat top pistons 6.0 4.030 build compression Our builder is building a 370" 6.0 for us and said he is using flat top pistons.
We are using stock crank stock rods. New pistons.
he said that the compression with 64cc heads will be 10.5, and I'm a little confused because I would think ls2 flat tops with no reliefs had like 11.0 and this is .030 block and why the compression could be less.
does anyone have any insight on this.
also what piston could we use to drop into the stock stoke rods 3.662 6.098 and achieve about 11.5.
will these diamond tsp pistons fit. https://www.texas-speed.com/p-5905-d...roke-20cc.aspx
we are gonna be using prc 225 or tfs cast 220, ported fast 92 or ob 102
thanks
We are using stock crank stock rods. New pistons.
he said that the compression with 64cc heads will be 10.5, and I'm a little confused because I would think ls2 flat tops with no reliefs had like 11.0 and this is .030 block and why the compression could be less.
does anyone have any insight on this.
also what piston could we use to drop into the stock stoke rods 3.662 6.098 and achieve about 11.5.
will these diamond tsp pistons fit. https://www.texas-speed.com/p-5905-d...roke-20cc.aspx
we are gonna be using prc 225 or tfs cast 220, ported fast 92 or ob 102
thanks
08-20-2018, 01:11 PM
#2
I get 11.25 with 64cc heads, flat top, 4.030 bore, 3.622 stroke, .052 gasket, and pistons .005 out of the hole
Sometimes I use .007 out of the hole in the calculator and that bumps the compression about .06
You could do .045 head gaskets for 11.45:1 or .040 for 11.6:1, again that'll vary just a hair depending on how high your pistons are above deck
Sometimes I use .007 out of the hole in the calculator and that bumps the compression about .06
You could do .045 head gaskets for 11.45:1 or .040 for 11.6:1, again that'll vary just a hair depending on how high your pistons are above deck
08-22-2018, 10:33 PM
#3
Didn't you post this in the gen 4 section also?
Theoretically....
I get 11.16 with 64cc heads, flat top 0cc, 4.030 bore, 3.622 stroke, 6.098 rods, .052 gasket, and pistons .005 out of the hole, assuming something like cometic part number CGT-C5014-052 that has gasket bore diameter of 4.150
Use these gaskets: Cometic MLS Head Gaskets H1295SP5051S
Use these pistons: https://www.briantooleyracing.com/cu...tock-rods.html
You'll be at 0 out of the hole and compression of 11.57:1
In a perfect world where theoretical = actual measured some 0.053 gaskets at that 4.030 gasket bore diameter puts you at exactly 11.50:1
Your engine builder will need to actually measure how far the pistons are coming in or out of the hole and they based the gasket selection on whatever will get you closest to 11.50.
Theoretically....
I get 11.16 with 64cc heads, flat top 0cc, 4.030 bore, 3.622 stroke, 6.098 rods, .052 gasket, and pistons .005 out of the hole, assuming something like cometic part number CGT-C5014-052 that has gasket bore diameter of 4.150
Use these gaskets: Cometic MLS Head Gaskets H1295SP5051S
Use these pistons: https://www.briantooleyracing.com/cu...tock-rods.html
You'll be at 0 out of the hole and compression of 11.57:1
In a perfect world where theoretical = actual measured some 0.053 gaskets at that 4.030 gasket bore diameter puts you at exactly 11.50:1
Your engine builder will need to actually measure how far the pistons are coming in or out of the hole and they based the gasket selection on whatever will get you closest to 11.50.
Last edited by 5.7stroker; 08-22-2018 at 10:57 PM.