GMCtrk

iTrader: (27)

Your starting point is off. The LQ9 is 10.1:1

InchUp

iTrader: (2)

I'll entertain that idea to prove a point. Even IF I was off by that .1 compression point, that still leaves 10.9:1 instead of 10.8:1 with 243 heads.

And for the record, GM says 10.0:1

http://media.gm.com/us/powertrain/en...TEC60LGENIIIV8

hirdlej

iTrader: (31)

Hey poopie pants, my LQ4 with 243 heads and stock 6L gaskets and the pistons being .014" out of the hole comes out to 10.6:1 comp. You need to know your piston to deck height as well

hirdlej

iTrader: (31)

I wouldn't LOL too much, I entertained the same idea building my 6L. It was more cost effective however to buy NEW 243's and have a guy port them locally than it would have been to buy heavily ported 862's from patriot.

bluecajun5.3

iTrader: (31)

that's what i'm planing to do except i would like to try to get close to 11:1.

zippy

If time permits I'm going to check piston to deck clearance. I'd also like to cc the heads after I get them done to be accurate. I have too many other jobs going on at the same time so I'm trying to fit this one in.

zippy

I picked up the heads today. BEI did them and they look very nice. I'll post pictures when I get home and start assembly.

zippy

Checked piston to valve clearance last night. Exhaust side is .250" and intake is .133". This is with no head gasket in place and piston at TDC. Heads are now assembled with LS6 springs.

OnyxSilveradoSS

iTrader: (4)

TI-89 yea baby! nothing like the Caddy of calculators

nt to hyjack but keeping the mathematicans working
what compression for LQ9, L92 heads, GM MLS gaskets?
I read 10.8:1 but felt like a double check

zippy

There is hardly any difference in the two Joe. I think you gained a tenth or two. You'd have to be down around 65cc or so to get the compression up that high.

The Tahoe now runs. Fired the 6.0L last night. Trans goes in tonight.