TeenagerWith74Vette

Alright guys, I need a little advice. First of all, what kind of internals does my '74 L-82 have? Forged Crank? Pink rods?

I also have a 2-bolt main 400 block. Could I put the L-82 internals in the 400 and get a 377? How would this work with the relatively short rods? Would this motor rev pretty high? I'm tring to run some 12.0's in my Vette.

Would I need to convert the 400 block to 4-bolt mains, how much machining would be acquired for this?

Thanks in advance,
Jay

ReydeSol774bbl

A 383 is a 350 bored .030 over and with a crank from a 400. A 377 is created when you don't bore and use a 400 crank. You can destoke 1 400 into a 372 by using the crank of a 350.

I am pretty sure this is accurate, either that or I am having reading problems tonight. Hope this helps

1979toy

A 377 is created by installing a 350 crank in a 400 engine that has had a .030 overbore. 372 is from a standard 400 bore with a 350 crank.
These motors love to rev, fast and high. Use a splayed 4 bolt main conversion and a forged crank with good rods and pistions.
Good luck with it.

gkull

The two bolt block is the best. Have it drilled to the splade caps. Then forget old tech. That said you are rpm or Feet per M. limited. Any new 400 - 406 will do any RPM you ever want and make more power across the board.

gkull

I should ad that L-82's have good rods and a chevy forged crank. They are strong enough to make the base for 7000+ rpm motors. I never had the bottom end pop with a B & B. Valve train and pistons go away first.

fauxrs

teen....

Check out my engine page here... http://www.corvetteforum.net/c3/fauxrs/enginespecs.html as I've been planning a similar engine.

Keep in mind that a 350 can be made to rev just fine for any street or strip application, the added cost of a 377 is more for yourself (to be different) than to take advantage of any inherant advantage to the combination. Longer rods would be better.

TeenagerWith74Vette

Only 411 hp?? I'm really looking for more than that. The cam seemed a little small, maybe more cam would help. My current combo runs 13.9's with no tuning and factory heads. I'm really looking for more horsepower in my next combo. Anybody have any suggestions?

There was a good arcticle in a magazine about a month or two ago. It had 7 chevy build-ups in it. I can' really remember which one it was. Does anybody have it?

fauxrs

my problem is the motor must remain completely smog legal - pass visual and emissions testing. Thats why the cam is small. Apart from drag racing - which I dont do - 411 hp is about 100 hp more than I will ever really need on the street.

As for more hp, not hard, more cam better exhaust, better intake will help greatly.

gkull

411 hp is about 100 hp more than I will ever really need on the street.

You must have very short streets in San Diego! :D

For the teenager I would recommend buying some books on how to hotrod small block Chevy's. You can't really use a 350 crank in a 400 block because of the main bearing sizes. They do make spacers etc. But I wouldn't do it. The L-82 had all kinds of heavy duty parts in it. All it needs is a little more cam & compression and its over 400 hp. NHRA ProStock trucks get as much as 850 hp out of a bored out 350.


[Modified by gkull, 3:19 PM 8/30/2001]

TeenagerWith74Vette

Well, I think I'm about to bur some Dart Pro 1 heads. I'm going to get the 215 runners, with 2.05/1.60 valves. I'm going to get these worked on a little, that should raise my HP a decent amount. I'll probably get these heads flowed and match a cam to it. I'm hoping that'll get me a 12.99. Hopefully........................

P.S.---I had a 1.90 60ft and only a 13.9 quarter mile. That seems strange.
Jay

nunus79

1.90 60ft with a STOCK L-82????? That seems strange.

TeenagerWith74Vette

NO, No. Sorry for the confusion. I have my #'s matching L-82 bagged and tagged. I have a different 350 in my vette now. It has a cast crank, eagle rods, Keith Black pistons, L-82 heads (2.02/1.60 and some porting and valve job) 282 flat-tappet cam, Air-Gap intake, 700 Holley Vac. Secondaries, 3000 stall, and a TH-400 with a shift kit. I also had a friend's Mickey Thompson's on at the track. No tire spin at all!

I was just thinking of taking all the internals out of my L-82 to use for my next motor build-up.
Thanks,
Jay