Out of curiosity, how long (in general terms) could I expect this engine to last?

355 LT1
GM 15xx forged 3.48" 1pc crank
C&A Trackmaster 5.7" 4340 forged I-beam rods
TRW 21cc dished 4340 forged .030" pistons
King alecular bearings
internally balanced
LT4 hd timing set
9.2cr

I plan to put 9psi of intercooled boost on this engine initially. Possibly 12psi at a later date.

The top end is comprised of GTP Stage 2 heads, Comp Pro Magnum 1.6 non-self-aligning rockers, Comp 'R' lifters, Comp .080" wall 1pc pushrods, and Comp dual springs (forgot the pressure rating now), and a Combination Motorsports grind (224/236 .536/.555 115).

That grind was initially meant for a built automatic, but I found that I just don't like autos and high stall unless I am going to build a track-only car. But the 115 lobe sep should still lend itself to smooth operation with boost, regardless of tranny.

I know that with boost you really never know how long you'll last..... so once the combo is together I plan to get a good base tune done and work from there.

Given the info here, how long would you estimate the engine to live if I stuck with 9psi ?

 

I have a 9.5:1 357 w/ around 17 psi on it still running strong. Tuning is everything in boosted applications. My buddy has a 9.8:1 4v Cobra w/ 22-24 psi on it and has run this setup for over a year now. His car goes 10.50's at 133.
Scott

 

As long as you dont detonate or lean it out..forever.

Tune is everything.