So I'm trying to decide what I want to do for a motor. I am possibly thinking of using my ported LE5 head on a LNF short block (giving me the option to use the E37 ECM) ditching the LNF pistons for some LSJ pistons. Then, I am not sure yet but can the LSJ's manifold bolt to the LNF or will I run into problems there. As for the flex plate, my current plan is to model it up at work and then machine out a new 8-bolt plate. For tuning I will see if I can use Moto Tron and then have the help of the entire Calibration department. Thoughts?

 

Flex plate for auto? Might be best off buying hhr ss auto flex plate

 

Why dont you just run LE5 block, p&p le5 head. Less custom work, more torque
The LE5 is good for 400ish

 

Touche, although it would cost me about 15$ to make it, and a little time to model it...either way.
My only grudge against the LE5 now is the failed sleeve. Kinda sketched me out.

 

Ah I gotcha; They cant be that bad, but I will find out soon with a 2.5/2.6 pulley on stock lower end.
Yes; quite a bit of auto HHR stuff should work, although I have never messed with one

 

lnf is direct injection, you cannot put an lsj intake manifold on it.

 

Yeah but if I use the LE5 head it becomes basically a gen 2 LSJ, and the intake mani will bolt up to the LE5 head because I've done that before.