2001AntiVenom

iTrader: (84)

I have looked around a little but what head gaskets should i get for a lq4 that im putting 99 ls1 heads on. Should i get 5.7 head gaskets or should i get 6.0 gaskets? Thanks in advance!

trans_am7935

iTrader: (15)

always match the biggest opening. LS2 head gasket

180ls1

iTrader: (4)

6.0l...

NVR_SPDS

iTrader: (39)

The block is a bigger concern than the heads, so go for the 6.0L gaskets.

Cold06

iTrader: (9)

What they said^^ always match the block!

PREDATOR-Z

Actualy it is "always match the bigger bore"

2001AntiVenom

iTrader: (84)

Awsome thanks guys

_GTO_

The gasket always matches the bore .

Sometime people use 4.000 bore gasket in their LS1 3.900 bore , I dunno know why but maybe because of having larger valves (2.04 or more) , that what I thought .

Anyone have another reason ?

PREDATOR-Z

Whether it is cylinder bore or head chamber bore, you always follow the biggest. I hope it clears this.
Expl: 6.0 heads on 5.7 motor, use 6.0 gasket; 5.3 head (stock) on 5.7 motor, use 5.7 gaskets etc....

devlmaycry

iTrader: (2)

Yep you want all of that gasket to be covered to avoid turning into hotspots is what I've heard if your using the MLS.

_GTO_

What about having 243 ported heads with 6.0L gasket ? what reasons make this happen ?

pwrtrip75

iTrader: (8)

You want the fire ring in the gasket always enclosed.. If its inside the chamber it will burn up. If you use a 5.7 gasket on a 6.0 block, the fire ring would protrude inside the cylinder....=burn up. All this is important for the fire ring. If its exposed from top or bottom its dead.

Same with like using 6.0 heads on a 5.3L The head chamber is bigger than the bore, so you want to make sure the fire ring is enclosed....you'd need 6.0 gaskets.