Does anybody know the difference between the corvette tpi 350 engine and the 91 camaro tpi engine???????? I just bought the engine on ebay and I want to know what I got myself into. The engine is a 355 with LT4 aluminum heads,roller rockers,summit dampener,and the corvette tpi intake. Thanks

 

if it has TPI, it does NOT have LT4 heads. and most likely, its NOT a corvette engine, they were the same as the F-Body engines.


got a link to the ad?

 

Thanks for your help. I hope I dont run into any problems. The engine should get here in about a week. Hope you can see the picture. and this is the description that they gave me on ebay.4-Bolt Main Bearings
1-Piece Rear Main Seal (1989 or Newer)
10.25:1 Compression Ratio
LT-4 Aluminum Heads (2.00" Intake Valves/1.55" Exhaust)
Chet Herbert Custom Grind Roller Lifter Camshaft
Roller Rocker Arms
Summit Dampener
Tuned Port Inspection Intake Manifold

 

Aluminum heads? yup. LT4? No. Ignoring the fact that the TPI baseplate won't bolt up without some work, I highly doubt the ports would even line up correctly.

 

What do you think I can do to make it fit my aplication. 305 tpi???Should I change the intake>>???

 

Man and I tought I got a good deal. Well I hope I can make this work

 

You may have gotten a good deal. Depends upon the condition it's in, the cam that's really in it, and how much you paid.

The difference between f-body and Vette L98's is the aluminum heads on Vettes from '86-1/2 on up (before that the Vette L98's had cast iron heads). The aluminum heads did not have the exhaust cross-over passages, so the EGR gases had to be routed externally from the exhaust manifold to the intake base. If that is a Vette base, you're in good shape, all you have to do is plumb that externally. If passing emissions isn't an issue and you don't want to hassle with plumbing the gases, just program out the EGR valve function in the PROM (which will require tweaking the timing tables as well).

The seller is either a little ignorant or dishonest. TPI stands for "tuned port injection". Those aren't roller rockers, those are roller tip rockers (not a big issue, just a mis-representation). The LT4 and ZZ4 both used the same valve springs, perhaps he assumed that's what the heads were because of that (that's a stretch, but the best excuse I could come up with for him calling them "LT-4" heads - maybe it's because they have larger than stock ZZ4/L98 valves - who knows). 1-piece rear main seals started in 1986.

I wouldn't fret too much. You'll need a 350 knock sensor & module, probably need larger injectors, perhaps PROM tuning. But, as long as the cam was chosen to be compatible with TPI, the engine should be fine.

 

Thanks for your help, when I get the engine I will post some more comments.