Help using Class Racer Info

JP1738 · 07-08-2025, 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 · 07-08-2025, 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

Glenn Briglio · 07-09-2025, 12:17 PM

Run it as a 1978 nhra rated at 270hp. 1979 nhra rated at 279hp.

Greg Reimer 7376 · Today, 10:40 AM

Many,many moons ago,I had a 70 Chevelle,350,QJ carb, actually it was a parts car, and it had that same casting # block in it. It looked identical to the 010 block, and I have seen a few of those blocks in other places,including in race cars. Seems to be a factory piece interchanged with the 010. Should be no problem using it. Just make sure any blocks, heads,or intakes are accepted. I would have no problem using it in a race car.

07-08-2025, 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

07-08-2025, 04:07 PM	#2
BRETV Senior Member Join Date: Oct 2003 Posts: 564 Likes: 4,114 Liked 772 Times in 198 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

07-09-2025, 12:17 PM	#3
Glenn Briglio VIP Member Join Date: Nov 2002 Location: Massapequa Park,NY Posts: 1,281 Likes: 1,889 Liked 968 Times in 307 Posts	Re: Help using Class Racer Info Run it as a 1978 nhra rated at 270hp. 1979 nhra rated at 279hp. __________________ 1989 Camaro Iroc-Z I/SA B&B Auto Machine Shop.

Today, 10:40 AM	#4
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,134 Likes: 172 Liked 703 Times in 217 Posts	Re: Help using Class Racer Info Many,many moons ago,I had a 70 Chevelle,350,QJ carb, actually it was a parts car, and it had that same casting # block in it. It looked identical to the 010 block, and I have seen a few of those blocks in other places,including in race cars. Seems to be a factory piece interchanged with the 010. Should be no problem using it. Just make sure any blocks, heads,or intakes are accepted. I would have no problem using it in a race car.