I know a TPI off of a 305 LB9 will fit on a 305 LO3. What I need to know is how it will profrom? The LO3 with the TBI has 170hp. And the LB9 305tpi in my 89 iroc-z is 195hp. The C.R. on both are 9.3:1 Would the HP be 195 are closer to 170? If you know anyone that has done this or if you have any info please help. Thanks

 

it would be about the same as the lb9's power but possibly a little less because i beleive the cams are different. ill be finding out in about a month i just got the tpi unit and after a few missing arts are located ill be installing it.

 

I installed the TPI intake and computer on my 92 RS 5-speed, with no other changes. It made 17 HP and 70 TQ more at the wheels. It went from 158 HP to 175 HP, and 220 TQ to 290 TQ. I later installed a TPI cam and it went up to 187 HP at the same 290 TQ.
Remember you have to change the computer and wiring harness, too.

 

Thanx Guys, I'm getting a LB9 from PowerPro Engines for $1,535 with a 5 years 100,00 mile warranty.

 

Uhm... if you're pulling out the engine, why put back in a 305?