1970 400 original engine question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Dieselwrencher** · 10-01-2007, 08:54 PM

Hello everyone! I am getting ready to drop a small block in my 70 longhorn and I have a quick question for all of you. I have had many 69-72 chevy trucks, and I haven't seen many 400 small blocks in them. So my question is, did gm install the 400 sbc in a Longhorn type truck, or was it a 402 bbc? I know they never produced a bbc 4x4 as far as I have ever seen but am not sure about this one. This truck also has the newer style engine mounts like the 73 up trucks use, clam shell type, and not the one bolt through the crossmember like most of them had. The guy I baught the truck from said it was a sbc truck originally but I am just curious. Thanks Ryan.

earl87gta · 10-02-2007, 02:25 AM

Im not sure if they were ever in the 70-72 trucks but the first year the SB 400 was offered was in 1970 so I guess it would be possible.

Long Roof · 10-02-2007, 08:02 PM

No 400 small blocks where used in 67-72 trucks that I know of. This engine was put in Caprices, Montes, Chevelles and many station wagons. The truck 400 is actually 402 BB which is actually a bored 396 BB. Confused yet? Also, no BB were ever installed from the factory into 4x4's. GM moved the engine/trans rearward to clear the front diff so that left no room for the wide BB at the firewall.

Truck Hippy · 10-05-2007, 11:04 PM

I'm pretty sure 400 ment big block in the trucks. I have had a lot of these heaps and I have never seen a factory sb 400 in one.

**Dieselwrencher** · 10-06-2007, 07:14 AM

I knew they called the 402 bbc a 400 but wasn't sure about the small block 400 being in them. Thanks for the info.

496 chevy · 05-20-2010, 12:17 AM

I am pretty sure the 400 small block was not produced until the next generation body style.

10-01-2007, 08:54 PM	#1
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,141	1970 400 original engine question Hello everyone! I am getting ready to drop a small block in my 70 longhorn and I have a quick question for all of you. I have had many 69-72 chevy trucks, and I haven't seen many 400 small blocks in them. So my question is, did gm install the 400 sbc in a Longhorn type truck, or was it a 402 bbc? I know they never produced a bbc 4x4 as far as I have ever seen but am not sure about this one. This truck also has the newer style engine mounts like the 73 up trucks use, clam shell type, and not the one bolt through the crossmember like most of them had. The guy I baught the truck from said it was a sbc truck originally but I am just curious. Thanks Ryan.

10-02-2007, 02:25 AM	#2
earl87gta Senior Member Join Date: Dec 2003 Location: Kingsport TN Posts: 4,641	Re: 1970 400 original engine question Im not sure if they were ever in the 70-72 trucks but the first year the SB 400 was offered was in 1970 so I guess it would be possible. __________________ Earl 68 2500 4x4 GMC Burb

10-02-2007, 08:02 PM	#3
Long Roof Old School, New Style Join Date: Jun 2005 Location: Monroeville, Ohio Posts: 790	Re: 1970 400 original engine question No 400 small blocks where used in 67-72 trucks that I know of. This engine was put in Caprices, Montes, Chevelles and many station wagons. The truck 400 is actually 402 BB which is actually a bored 396 BB. Confused yet? Also, no BB were ever installed from the factory into 4x4's. GM moved the engine/trans rearward to clear the front diff so that left no room for the wide BB at the firewall. __________________ The Good: - 72 GMC Jimmy 4x4 - 307 cid / 350 th - 70 Chevy Suburban 1/2T 2wd - 454 cid /400 th - 96 Chevy Impala SS - mainly stock - 98 Chevy Tahoe LT 4x4 - all stock The Bad: - 86 Chevy Suburban 1/2T 4x4 - winter beater The Ugly: - 72 Chevy Suburban 1/2T 2wd - parts truck

10-05-2007, 11:04 PM	#4
Truck Hippy Registered User Join Date: Aug 2002 Location: Hickory, NC. Posts: 776	Re: 1970 400 original engine question I'm pretty sure 400 ment big block in the trucks. I have had a lot of these heaps and I have never seen a factory sb 400 in one.

10-06-2007, 07:14 AM	#5
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,141	Re: 1970 400 original engine question I knew they called the 402 bbc a 400 but wasn't sure about the small block 400 being in them. Thanks for the info.

05-20-2010, 12:17 AM	#6
496 chevy Registered User Join Date: Nov 2009 Location: Longview, WA Posts: 99	Re: 1970 400 original engine question I am pretty sure the 400 small block was not produced until the next generation body style. __________________ crew cab chevy cummins powered



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