anyone know what the deck height of the lq4 is?...is it the same as the ls1?

should be around .007 or less i believe

 

Huh? The factory deck height of the LQ4/LQ9 block SHOULD be 9.240"

 

Block deck height is 9.240". The piston deck height is typically .004" - .009" above the deck. The factory blueprint spec for piston deck height is .009" above the block deck.

 

piston deck height is what i was looking for..thanks
im using a lq4 shortblock with 62 cc ls6 heads...probably .040 head gaskets

think i came out to about 10.75 cr...does that sound about right?

 

I calculate 10.83 with .040/4.039" head gaskets. Pistons .009" out of the hole. I'm assuming you milled the heads from the original 64.45 cc's?

 

yeah they were milled to 62...bout the time i hit enter to post i realized i should have posted that. who makes the .040 head gaskets?

 

Cometic

 

figures lol..i have two brand new cometic head gaskets but they are for a ls1 bore

 

Most head gaskets are .100+ larger than the bore they are advertised for. Might be worth a shot to measure the gasket size. Was this accounted for when figuring your compression?

 

i think i used 4.05 or 4.09 on the gasket bore size when i figured it.

 

As long as the cometics you have aren't smaller than the bore, run em.

 

ive measured up to .013 on a 98 engine
and a few lq4 have come in at .011

 

your talking about the piston deck height ?..if so and mine is that way it would sure help my compression. do u use a mic attached to the block to measure that?...

 

You use a dial indicator attached to a "bridge" then rock the piston in the bore and get your average number in or out of the hole.

 

ok thanks thats kinda what i was figuring...

with the 6.0 block ported ls6 heads and moderate cam what am i goin to have to do to start it up with out messing anything up. ive just got the stock ls1 computer with stock tune.

 

It will run on the stock tune. The cam(depending on size) will likely cause a poor and unstable idle. As long as you don't have larger than stock injectors you will be okay to start and drive it. But don't try any WOT runs until it's tuned.

 

what about the stock #26 injectors...they will need to go wont they?...any idea what the injectors are off an 03 yukon 6.0?... course if they dont fit the ls1 fuel rails i guess it dont matter.

 

You will need to upgrade the injectors but you will have to wait until you can tune for them. I believe the 03 6.0 has 24lb/hr injectors and I don't think they fit the LS1 fuel rail. A mail order tune is an option if you want a good baseline and the ability to upgrade injectors now.

 

will the older ls1 #28's work or do u think im goin to need 33's?..
looking at something like the comps 228/230 .588/.591 114
1 3/4 pacesetters

 

heres another question... how much would have been milled from the heads to get from the stock cc to 62?... (243's) and how much is that goin to hurt my ptv?