Help using Class Racer Info

JP1738 · Yesterday, 03:45 PM

Hey everybody, quick question on a particular combo:

I've been looking through the guide and trying to sort out what I could and couldn't use for a combo for my wagon. I have a block on hand that I could potentially use for a 350 combo, but I can't figure out if the casting number is the right one or not.

It has casting number GM 3970014. I can't find anything in the guide that lists what the stock casting number would be, only after market replacement stuff. Can I use this block for a '79 350 combo? I can't find much of anything on the internet about this particular casting and I don't know how it can be used in terms of class racing. Is that block kinda like Q-jets where one particular casting can be used across the board for lots of years and combos? Please help!

BRETV · Yesterday, 04:07 PM

Dawson, any factory block is legal. If you do go aftermarket, it has to be one of the NHRA accepted blocks for that combo.

Bret Velde
2003 I/SA
Coming soon

Yesterday, 03:45 PM	#1
JP1738 Senior Member Join Date: Jan 2024 Location: Charlotte, NC Posts: 554 Likes: 1,572 Liked 1,156 Times in 324 Posts	Help using Class Racer Info Hey everybody, quick question on a particular combo: I've been looking through the guide and trying to sort out what I could and couldn't use for a combo for my wagon. I have a block on hand that I could potentially use for a 350 combo, but I can't figure out if the casting number is the right one or not. It has casting number GM 3970014. I can't find anything in the guide that lists what the stock casting number would be, only after market replacement stuff. Can I use this block for a '79 350 combo? I can't find much of anything on the internet about this particular casting and I don't know how it can be used in terms of class racing. Is that block kinda like Q-jets where one particular casting can be used across the board for lots of years and combos? Please help! __________________ Dawson Pauley #2827 N/SA 1980 Malibu SW 2S 305/180 #2827 S/ST 1978 Mazda RX7 w/ 383 sbc/glide

Yesterday, 04:07 PM	#2
BRETV Senior Member Join Date: Oct 2003 Posts: 563 Likes: 4,098 Liked 769 Times in 197 Posts	Re: Help using Class Racer Info Dawson, any factory block is legal. If you do go aftermarket, it has to be one of the NHRA accepted blocks for that combo. Bret Velde 2003 I/SA Coming soon