I wondering If my 75 L82 motor came with forged crank, rods, and pistons from factory.

I'm pretty sure my motor had forged TRW pistons but not sure if crank or rods are forged.

Is a L82 stock crank capable of handling 450hp if rpms are kept under 6200? wasnt the L82 crank the same one GM used in the LT1 motor from 70-72?

 

Yes your L82 should have the good crank and rods as well as forged pistons and is more than capable of handling 450 hp

 

thanks!

 

"Pink Rods"

 

This question was asked before, but yup you're good to go.

 

Man, I'm about to be flamed here.

A stock Chevy smallblock can easily take 400 HP, but failure rates really jump when asked to give more. The bottom end is usually at fault, the mains crack and fail when subjected to excessive power. You can get 450 HP but do some things prior to assembling the engine.

Four bolt mains are a must. A lot of Vette's engines have been replaced over the years with a stock 350 Chevy engine; externally they look the same as their Four Bolt brethren so it's easy to assume that it's a L-82 engine.

Next, have the block checked for any microfractures. It's silly to store water in a container with a hole in the bottem, it's also silly to place a couple of thousand $$$ in a block that is fatigued.

Unless you're really into building an engine, if you're out to have a car you put on the street, investigate getting a crate engine. When you consider the parts, labor and time spent building an engine, you can get a crate engine for less $$$ and they come with a warrenty.

I investigated placing a stoker engine in my Vette, then found that it's original L-48 engine wasn't in the bay - it was a typical SBC. After running the numbers, a turn-key ZZ4 330 HP engine fit the bill for what I wanted, was much less expensive than what I planned to do and came with a 12 month warrenty.

So why did I decide against going the over 400 HP route? I didn't want to spend the moolah that beefing up the rest of the car. The L-48 was 185 HP, the ZZ4 was almost twice that. I had no desire for the engine to grenade the transmission, U-joints or rear end. I did have to place a new radiator in to safely cool the engine, transmission and AC system.

But if you're building a track or strip car, then you know what you want and a custom engine build may be the route for you.

Good luck with whatever you do.

 

Well proper prep of the motor is always desireable. Im not going to agree that a 4 bolt is mandatory to withstand 450 hp, but proper assembly and prep certainly is.

Its very true that many c3's have had their original motor replaced but I see no reason to not accept the OP's word that he has his original L-82.. which will be a 4 bolt motor and have all the good bottom end parts.

The L-48 / ZZ4 gap isnt quite as large as you are assuming either. The L-48 is rated net & the ZZ4 is rated gross (like the vast majority of crate motors) so the gap isnt quite as big but in any case, the ZZ4 is a pretty good bargain if you ask me.