LS1 heads on LQ9 or LQ4 with MS4?
#1
LS1 heads on LQ9 or LQ4 with MS4?
Would I be able to run my MS4 cam with stock unmilled heads on an LQ9? What compression ratio would I be looking at? What size head gasket would you recommend?
Am I correct that everything else bolts up like it would on an LS1? Are the rods/crank the same as the LS1?
What is the stock bore size for an LQ9 and what'sthe sixe that people usually bore it to?
Are there any factory cranks that offer a longer stroke that will fit in the LQ9?
Sorry some of these may be dumb questions but I'm new to these motors. Any other advice you can offer would be great. Thanks a lot!
Am I correct that everything else bolts up like it would on an LS1? Are the rods/crank the same as the LS1?
What is the stock bore size for an LQ9 and what'sthe sixe that people usually bore it to?
Are there any factory cranks that offer a longer stroke that will fit in the LQ9?
Sorry some of these may be dumb questions but I'm new to these motors. Any other advice you can offer would be great. Thanks a lot!
#4
Will the MS4 fit with LS1 heads (if they are any different than the 317s)?
I plan on spraying a 200 shot, will a stock GM gasked hold that (with ARP studs)?
Thanks for the response!
#7
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The LS1 heads have a smaller combustion chamber, which will raise the compression over the stock 6.0 heads. An LQ9 has flat top pistons and an LQ4's pistons are dished. Compression ratio with LS1 heads is 10.8:1 for the LQ9 and 10.0:1 for the LQ4(both with stock gasket). I would recommend the GM MLS gasket unless you want to flycut to run a thinner one. An 0.040 thick gasket with 2cc's of flycutting will raise compression by 0.2(11.0 &10.2 respectively).
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#8
The LS1 heads have a smaller combustion chamber, which will raise the compression over the stock 6.0 heads. An LQ9 has flat top pistons and an LQ4's pistons are dished. Compression ratio with LS1 heads is 10.8:1 for the LQ9 and 10.0:1 for the LQ4(both with stock gasket).
Is 10.8 too high for 93 pump gas? What about with nitrous?
I would recommend the GM MLS gasket unless you want to flycut to run a thinner one. An 0.040 thick gasket with 2cc's of flycutting will raise compression by 0.2(11.0 &10.2 respectively).
Would a GM MLS headgasket hold 10.8 CR with a 200 shot? (using ARP bolts or studs) Or would you recommend a Cometic of stock thickness?
Is 10.8 too high for 93 pump gas? What about with nitrous?
I would recommend the GM MLS gasket unless you want to flycut to run a thinner one. An 0.040 thick gasket with 2cc's of flycutting will raise compression by 0.2(11.0 &10.2 respectively).
Would a GM MLS headgasket hold 10.8 CR with a 200 shot? (using ARP bolts or studs) Or would you recommend a Cometic of stock thickness?
#9
10 Second Club
iTrader: (10)
With the MS4 11:1 static compression would be fine and you could safely go up to 11.5 if you wanted to mill the heads and flycut. I'm not a Nitrous person myself, but I would think the compression is fine there also. The GM MLS gaskets are probably your best bet, lots of people here use and recommend them. Check the stickies in the Nitrous Oxide section and I'm sure you will find the answer to your questions.