In order to be legal...it had to come off the factory assembly line....the LD340 did not...even though it had a factory part number on it.
So what's the problem ?
Problem is simple...THE LD340 INTAKE MANIFOLD WAS NOT ON THE ENGINE WENT IT ROLLED OFF THE ASSEMBLY LINE....that is nhra reason..
So again I ask (read post 25)NHRA legal Performer RPM aluminum cylinder heads for Stock and Super Stock racing classes. These heads are similar to Edelbrock RPM cylinder heads, however the NHRA Legal heads do not have any machining or hand grinding done on the ports & chambers, except for the seat guide bores. Heads feature the NHRA logo on the ends for easy identification. Heads are sold individually. Made In The USA!
Since they are 65 cc ..my guess is they are open chamber heads....wondering if the 11/32 valve stems are legal or do they need to open the guides up to 3/8.....
It is up to the racer and/or engine builder to make sure that the runner volume and combustion chamber CC's are no larger or smaller in volume than what their particular engine corrected horsepower is approved by the NHRA Race Committee. The runner and chamber volume CC's listed below are what they are supplied from Edelbrock, not that they are approved for this volume in your particular class.
aftermarket intakes should not be legal in stock, they generally do not crack or turn to junk. aftermarket heads should not be legal in STOCK; superstock O K, if port size etc. is modified to not exceed stock. back in the day I bought a good used ld340 for $20, and sold one for $40. Chrysler made and installed some production aluminum intakes, just not enough
I thought this was interesting about the heads. A few years ago I asked a Stock Elim. racer about the NHRA Edelbrock heads he had on his 340. He told me the heads were approved because usable original cast iron heads were getting harder and harder to find, and that the NHRA had approved a replacement aluminum head for the Chevy's several years before that. He also told me he had to put the weight savings from the aluminum heads back onto the FRONT of his car. Did the NHRA already approve an aftermarket intake for the Chevy's too? I dunno.So again I ask (read post 25)
Thats what im saying. It is not a factory, assembly line part.
My question is, why was it EVER legal ?
It should have NEVER been legal in the STOCK class.
So when will the “accepted” aluminum heads get axed?