Austin@HPE

My friend just got his 440 ls7 what size head gaskets should he use. I know stock ls7 gaskets measure 4.150 he is looking to get cometics for alot of nitrous. Is this the best size?

Ron@Vengeance

iTrader: (51)

Your friend will need to calculate his compression and order the head gaskets accordingly. I would ASSume he would run a 4.200 Bore x .040 Cometic, but its going to depend on piston configuration/combustion chamber CC/desired compression..

Austin@HPE

its using tfs235 it was built to 11.5 using stock gm mls gaskets

Austin@HPE

I dont see a 4.200 on cometics website.

Robin L

What bore size is the 440 ?

What block?

Cometic makes a 4.185 that is sold through GM Performance Parts for the LSX 6 bolt heads.

Robin

Austin@HPE

4.125 bore x4.125 stroke its a brand new ls7 block

ATVracr

iTrader: (5)

If its a N20 motor make sure the quench isnt to tight.

Gordon0652

iTrader: (4)

I am building an LS7 440 and i will be spraying at most a 225shot and i am going to run the stock LS7 MLS gasket. (4.130 x 4.100)

3timeracin

iTrader: (15)

The most important thing to calculate is the deck height ! that will impact the actual gasket thickness needed to get the correct quench and not detonation or piston to head contact.

Austin@HPE

thanks guys we are getting 4.150 .051 thickness cometic gaskets.