i just got my t/a a little while ago (september) and just started driving it about a month ago (it was not driving when i got it...)

anyway, ive been told that the cam and heads came out of a 1992 Corvette ZR1, now i know thats the biggest and best of that year and all, but im having some trouble finding info about it...

So if someone could tell me everything they know about the cam and heads from that car, or point me in the right direction for information that would be great.

 

ZR1 motors are completely different than a basic sbc.. the ZR1 is called the LT5.. it has 4 overhead cams.. unless the entire engine came out of the vette, then that guy was giving you a LOAD of

 

well then maybe it was the step below ZR1 in the Vette lineup... cause i was told that everything but the actual block was taken from the Vette... he said it was the best vette of that year, so i automaticly assumed ZR1




this is exacly the info i was lookin for! keep it commin!

 

the lt5 was an all aluminum motor built by lotus.. the LT5 topend will only work on the LT5 motors.. nothing else.. unless you can look at your motor and see if its aluminum and has a TPI looking induction with 16 runners instead of 8, then you have an LT5..

this picture is what an LT5 topend looks like.. notice the sparkplug wires in the middle of the valve cover.. thats the dead giveaway.. well actually the entire motor is a giveaway..

 

ok, well with that being said, do you know what the biggest cam ever made would be. (by GM) cause he also through that out too...


and thanks, im glad i got that clear before i started blabbin it out to everyone

 

and sorry, dont know much about the internals and such.. i just know the basic stuff.. i doubt the cam is very big because it does have 4 valves.. probably nothing larger than .425" lift.. that guy you heard all this from is an idiot.. he should have never owned a 3rd gen..

 

u mean 4 valves per cylinder?

and hoe many cams does my engine have? (or did it have stock?) 2 right?


THANKS AGAIN!

 

I think it's a pretty safe bet that somebody was exaggerating a little bit. OK, more than just a little.

The LT5 heads don't fit a regular 350. You'd have to have THE WHOLE LT5 in order for the heads to work. While not impossible, I'd guess that's pretty unlikely.

See if a magnet sticks to the heads. If it does, then they're cast iron, and they're not "from a Vette" at all. They're the stock ones for a Camaro or Firebird TPI 350 motor at best, and could easily be something ALOT WORSE than that. If the magnet doesn't stick to the head casting, then it's aluminum, and they might be the ones off of the Corvette version of the TPI 350, or they could be aftermarket.

If the heads are stock, most likely the cam is stock too. IIRC the lift on that cam is something like .415" / .435"; but I could be wrong. It's something kind of like that though. Well under .450".

 

yes, 4 valves per cylinder.. sorry for the confusion.. and our motors only have 1 cam.. not to rag on you or anything but you yourself need to do some reading about motors and such.. chevrolet never made a motor with 2 cams.. well not a v8 anyway.. ALL v-8s chevy has produced have 1 cam.. the LT5 was a lotus design(not chevy) and was a really special edition motor..

 

thats a sick looking engine that LT5 is. how much power did it make? know any specs?

 

the early(till '92) LT5's made 375hp.. the 93 and later made 405hp.. and i believe it had a 7200 redline.. heres some stuff off of google..

YEARS 1990-92 1993-1995
SAE Net Power: 375 hp @ 6,000 rpm 405 hp @ 5,800 rpm
SAE Net Torque 370 ft lbs @ 4800 rpm 385 ft lbs @ 4800 rpm
Compression Ratio 11:1 Same
Bore/Stroke 99 x 93 mm (3.90 in. x 3.66 in.) Same
Firing Order 1,8,4,3,6,5,7,2 Same

 

ok, ill check the magnet thing tomorrow.

was the step blow the LT1, and then L98? so at best I have an L98 block with LT1 cam and heads. but werent the blocks all the same (effectively), and it was the heads, cam, and intake that made the engine???

 

LT1 heads require a TOTALLY DIFFERENT coolant flow than older heads. They can be retro-fitted onto the older 350s, but it requires a bunch of plugging and drilling and external plumbing to get everything to all hook up. Most likely you don't have those; although it's not impossible.

Also, the heads off of the LT1 versions in Camro/Firebird and Corvette, were aluminum; the ones on the version used in the Impala and Roadmaster were cast iron.

If I was you, I wouldn't get all worked up about what it "might" be. If it REALLY matters to you what part it is, take off a valve cover and get the casting number. That TELLS ALL, and DOES NOT LIE, unless you've got heads that a circle-track guy with a head rule has ground the casting number down and epoxied a new one on. Don't laugh, I've seen it done, with my own eyes; a favorite method of cheating in the "882 head" class, is to take a pair of 186s or whatever, and do just exactly that. But again... pretty low probability of it happening on some street-driven car. Not quite impossible, just HIGHLY unlikely.

Here's the stock casting number for a 350 TPI motor. You will find it in between some of the rocker arms.