Brett 91 RS LT1
10-02-2003, 12:57 PM
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 ?
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 ?