I have been searching around but havent found too much info on installing these heads on an lq9. I read about opening it up for the 4" bore. Is this needed? I got a really good deal on these heads and I would like to use them but I dont really want to mill or take anything off of them. How do you think this setup would run?

03 RCSB
224/230 .610/.605 111
Longtubes no cats
Truck intake
3200 stall

 

It'll be some high compression . . . Search some more posts by "skeet" . . . he beat the **** out of the same setup with a bigger cam.

 

you'll be fine, dont mill them, use a stock head gasket 52mm, your compression would be just over 12, tune for 93 and you wont have any issues..

 

I didnt think it would be that high. In THIS THREAD, Calspeeds truck was at 10.9:1 with a 5 layer gasket. BTW thanks for responding

 

jus checked it out, thanks for the correction, i could have swore when i put the 706 casting 2.5s on my lq9 richard at WCCH calculated compression over 12 ? but to answer your orginal questions i'd used them and you should run pretty darn good!

 

My buddy runs 243's on his lq9 with a mp112.. Runs pretty strong

 

That almost scared me away from this set up. 12 wouldve been a lil too high for me and they dont sell 93 anywhere here in vegas so I'd be mixing 91 and 100.

What was your setup? I tried searching through your posts but couldnt find anything.