01SSKilla

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!

01SSKilla

Where are the LQ4/9 experts at?

s346k

iTrader: (4)

yes, all of that stuff is interchangable. lq4 compression is 9.4:1 and lq9 is 10:1. lq9 is 4" bore, i think the max is 4.06. ms4 would easily fit and clear with either motor's stock longblock. i'd use a stock gm gasket. .055 i think.

01SSKilla

Is the compression with LS1 heads, any difference?

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!

01SSKilla

?????

01SSKilla

Are 2000 LS1 heads different than the LQ9 heads?

5.3LJimmy

iTrader: (10)

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).

01SSKilla

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5.3LJimmy

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.

musclecarkid18

iTrader: (1)

the MS4 makes 11:1 static comp. in a stock ls1? so roughly 10.2:1 in an lq4 with ls1 heads +MS4? no PTV clearance changes from 317 to 243 heads on lq4?