The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1972 C10 long bed beater with a 4.8 LSx swap

Matt Cramer · 08-09-2013, 09:36 PM

Oops, accidentally put my build thread title here and my question in the build thread board.

So, I'm trying to fit a 4.8 into my '72 C10. Using the mounts that set the engine forward 3", what appear to be six cylinder engine stands, and the cross member redrilled to move the engine stands back about 3" to put the engine in the stock location.

The 4.8 truck manifolds don't fit too well:

They hit the engine stands (right now the motor is resting in the engine compartment, but the stands are pushed so far apart they don't reach down to the crossmember) and exit too close to the frame rails. So, I need some sort of manifolds or headers that give a lot of clearance between the first and second cylinders on each side. The Doug Thornley headers look like they'd work, but are on the pricey side. I've seen a few similar swaps where someone tried Trailblazer SS manifolds, and they didn't work. Fifth generation Camaro manifolds look like a possibility. But then I found these:

BBK LS3 / L99 shorty headers

Looks like it might work - and would be a bit easier to hammer a bit of extra clearance into if they didn't, compared to an iron manifold. Anybody tried these, or other fifth generation Camaro headers, in a '67-'72 C10? Especially with the mounts far back on the block like mine and six cylinder engine stands.

08-09-2013, 09:36 PM	#1
Matt Cramer Registered User Join Date: Apr 2012 Location: Covington, GA Posts: 386	1972 C10 long bed beater with a 4.8 LSx swap Oops, accidentally put my build thread title here and my question in the build thread board. So, I'm trying to fit a 4.8 into my '72 C10. Using the mounts that set the engine forward 3", what appear to be six cylinder engine stands, and the cross member redrilled to move the engine stands back about 3" to put the engine in the stock location. The 4.8 truck manifolds don't fit too well: They hit the engine stands (right now the motor is resting in the engine compartment, but the stands are pushed so far apart they don't reach down to the crossmember) and exit too close to the frame rails. So, I need some sort of manifolds or headers that give a lot of clearance between the first and second cylinders on each side. The Doug Thornley headers look like they'd work, but are on the pricey side. I've seen a few similar swaps where someone tried Trailblazer SS manifolds, and they didn't work. Fifth generation Camaro manifolds look like a possibility. But then I found these: BBK LS3 / L99 shorty headers Looks like it might work - and would be a bit easier to hammer a bit of extra clearance into if they didn't, compared to an iron manifold. Anybody tried these, or other fifth generation Camaro headers, in a '67-'72 C10? Especially with the mounts far back on the block like mine and six cylinder engine stands. __________________ Matt Cramer 1972 Chevy C10 - 4.8 swap, long bed, and maybe one dent free body panel somewhere - SOLD 4.8 LS build thread Last edited by Matt Cramer; 08-09-2013 at 09:50 PM.