jsanford

iTrader: (4)

I'm planning on milling my 799 heads. I'm looking at taking off .030. Is there any preference in....

1. Taking .020 off the heads and using a .010 thinner head gaskets.
2. Taking .030 off the heads and use stock head gaskets.

Does it matter? Any benefit? Based off the numbers in theory, the amount coming off is the same. I've searched, but didn't find anything.

hifi875

iTrader: (2)

i milled my 243s .030 and used a .041 headgasket on my setup

Doug G

Mathematically that'll work.... but sometimes the gasket thickness you'll want/need isn't available....got to watch the quench.

But, on that note....I wouldn't try running a .020 gasket Vs. the .051 and try to save the machine shop costs.

The stunningman

iTrader: (47)

Use #1. You will gain more compression that way.

jsanford

iTrader: (4)

Thanks....That's what I'm looking for. Was one a better option than the other. Cost isn't the issue as it's only $80 to mill the heads.

windmill

iTrader: (4)

1# sound like thats way to go,,, whats the part number for the head gasket for the .041 gasket,,,,,, think thats what im goin to do.

windmill

iTrader: (4)

Gasket Bore Thickness Volume Fel-Pro p/n

4.100” .041” 8.9cc 26472L-041

4.100” .041” 8.9cc 26472R-041

4.100” .053” 11.5cc 26472L-053

4.100” .053” 11.5cc 26472R-053

4.200” .041” 9.3cc 26473L-041

4.200” .041” 9.3cc 26473R-041

4.200” .053” 12.0cc 26473L-053

4.200” .053” 12.0cc 26473R-053

4.270” .041” 9.6cc 26474-041

4.270” .053” 12.4cc 26474-053

fox12303

iTrader: (7)

Where is your piston? It it at zero deck height? Or is it sticking out of the hole? If I remember mine was on average .007" above the deck. If yours were the same then I would use the .051 thick gasket as it would give you a quench of .044" which is a good distance for a street/performance engine, IMO. I build to .045" as standard practice. If you use the .041 gasket it puts your quench at .034" which is too close. Stick to .040"-.050" quench. Piston height should be your determining factor as to your head gasket thickness.

799 heads are for a 6.0L engine? I am not versed on the part numbers. Your bore would be 4.000"(maybe a little bigger if you bored it) so don't use a gasket bigger than 4.100 bore. Figure out where your piston is, pick your head gasket thickness and then decide how much to take off your heads. Use a compression ratio calculator before your have the heads machined just to be certain you'll be where you want. I use the one online at kbsilvolite.com, very handy. Good luck with the build.

dealrcn

What head gasket would you use on a stock 6.0 with LS3 heads? No mods to block, pistons or heads.

89gmcs15

iTrader: (7)

I used stock ls3 gaskets from gm

wildcamaro

iTrader: (15)

Yea stock GM ls3 are 5 layer multi layer I believe