Well, here goes it. Right now my car (1986 Camaro Berlinetta) is resting comfortable in my garage with the LG4 in it. And, like most LG4 owners, I realize my car is too slow. Here comes the whole project thing...

Also in my garage is a 78 4 Bolt Main 350 block (bored .060 over) and a complete TPI setup (including wiring harness)from a 87 IROC. By spring, I hope to have the 350 in with the TPI setup and everything working.

My first question deals with the ECM. I'm guessing a custom chip is in order with this application. Where would be the best place for me to get my hands on one? I'm guessing everything else in the wiring/computer will work except for the chip?

Next comes the cam. How big of a cam can I run with the stock TPI setup? I was looking in Summit, specifically at the CompCams High Energy Series. Would the 268H (218 int/218 exh duration @ .050, .454 lift) be too much for this? How about the cam a step down, the 260H?

1.6 Roller Rockers? Good purchase?

The heads I got with this block the guy said were TPI heads, so I'm guessing they are LB9 heads or L98 heads. I'm planning on bringing these to the machine shop to get ported. Will this be worth it or should I just save up and invest in some better aftermarket heads?

Hmm... thats all I can think of for now. I'm sure I'll have more questions later -=)

------------------
Luke
94 Saturn SL (1.9L)
86 Camaro Berlinetta (5.0L) *TPI 350 In Progress*
Berlinetta Board Mod @3rdgen.org
Non-Tech Mod @LG4 Performance Team

 

Update on the cam - I broke out my PAW catalog after posting this and I found something cool. Its on page 293 if any of you guys want to check it out. They have 3 cams specifically for TPI.

For Tuned Port Injection 305 and 350 engine. 1200-1500 rpm range.

PART # 12-314-4
GRIND NUMBER: CS 260H-12 (350/T.P.I.)
ENGINE: CHEV SML BLK 265-400
INTAKE EXHAUST
VALVE ADJUSTMENT HYD HYD
GROSS VALVE LIFT .444 .444
.006 TAPPET LIFT 260 260
VALVE TIMING OPEN CLOSE
AT .006 INT 22 BTDC 58 ABDC
EXH 66 BBDC 14 ATDC
THESE SPECS ARE FOR CAM INSTALLED
AT 108 INTAKE CENTER LINE
INTAKE EXHAUST
DURATION AT .050 212 212
LOBE LIFT .2960 .2960
LOBE SEPARATION 112
THIS CAM SHOULD USE SPRING # 981-16


Good for stock TPI 350 or TPI 305 w/modif. computer. 1500-5500 rpm.

PART # 12-402-4
GRIND NUMBER: CS 260AH-14
ENGINE: CHEV SML BLK 265-400
INTAKE EXHAUST
VALVE ADJUSTMENT HYD HYD
GROSS VALVE LIFT .444 .444
.006 TAPPET LIFT 260 268
VALVE TIMING OPEN CLOSE
AT .006 INT 20 BTDC 60 ABDC
EXH 72 BBDC 16 ATDC
THESE SPECS ARE FOR CAM INSTALLED
AT 110 INTAKE CENTER LINE
INTAKE EXHAUST
DURATION AT .050 212 218
LOBE LIFT .2960 .2960
LOBE SEPARATION 114
THIS CAM SHOULD USE SPRING # 981-16

Best cam for 350 TPI w/ modified computer. 1800-5800 rpm range.

PART # 12-404-4
GRIND NUMBER: CS 268AH-14
ENGINE: CHEV SML BLK 265-400
INTAKE EXHAUST
VALVE ADJUSTMENT HYD HYD
GROSS VALVE LIFT .464 .464
.006 TAPPET LIFT 268 276
VALVE TIMING OPEN CLOSE
AT .006 INT 24 BTDC 64 ABDC
EXH 76 BBDC 20 ATDC
THESE SPECS ARE FOR CAM INSTALLED
AT 110 INTAKE CENTER LINE
INTAKE EXHAUST
DURATION AT .050 222 226
LOBE LIFT .3090 .3090
LOBE SEPARATION 114
THIS CAM SHOULD USE SPRING # 981-16


The first cam seems to small to me. I would run the 3rd one but will just changing the chip in the TPI setup be ok for it? Would I need to make any other mods to the TPI system?

------------------
Luke
94 Saturn SL (1.9L)
86 Camaro Berlinetta (5.0L) *TPI 350 In Progress*
Berlinetta Board Mod @3rdgen.org
Non-Tech Mod @LG4 Performance Team