Generation IV Internal Engine - lq9 with prc 237 heads
05-09-2012, 09:45 PM
I have a freshly rebuilt stock 2003 lq9. I'm looking to do a high compression all motor street car. Car will probably see the track twice a year. I was wonder where that would put me around compression wise and if i should get them milled and to what? After my heads are chosen (pretty sure it'll be these but im open to ideas) ill be having a cam specd out by predator. here is a list of what the car has:
102 fast set up, tsp 100mm maf, 104mm lid, full exhaust with bolt ons, and converter.
Not worried too much about hp numbers but would like to see a low 11 high 10 second pass out of it. Thanks a lot
05-09-2012, 09:48 PM
I also do not want to run into ptv clearance problems. I don't want to flycut
05-10-2012, 04:08 PM
Sorry to be slow to respond to your PM. Definitely look at the 227s and the 237s are too big for the stock LQ9. The 227s have a laid over valve angle so you can get away with a pretty sizable cam with out having to flycut.
05-10-2012, 08:52 PM
Ok thanks a lot. I will be contacting you shortly.
05-10-2012, 10:59 PM
Keep us posted - would like to see a H/C LQ9 run 10's but not sure you will get there without loosing a LOT of weight.
05-11-2012, 12:22 AM
Um sorry but I'd go with some tfs 225's if you want to stay cathedral.
05-12-2012, 07:56 PM
Yeah tfs are definitely something I have been considering. Ive just seen so many of these applications I want to do something a little different. Seen a couple of these set ups and they run pretty decent. we shall see I'm still waiting on a few other parts. And litle, u ever go to strats or anywhere like that? I'm from the st Charles area
05-13-2012, 09:35 AM
Lol I will be now that my car is almost done. Go to the Midwest section and you'll see my clown friends calling me out lol
Jason 98 TA
05-17-2012, 10:19 AM
What chamber size do you need? Also do you plan on cutting the pistons? this will better tell us your p/v constraints so we can select the best possible head for getting you compression & flow!!
05-23-2012, 02:03 PM
My old set up went 10.79 at 127 on the motor. Car weighed 3700 with me in it. Ported 5.3 heads, T-rex cam, th400 with a 4000 stall. High 10's can happen on a stock bottom end 6.0. It was a Lq9 and I did flycut .020. 11.2 :1 C.R.
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