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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Dec 2007 Posts: 166 Shop Shark | | Shop Shark Joined: Dec 2007 Posts: 166 | My buddy said to use the same exhaust manifolds on my rebuilt 454 engine or I,ll have major problems. I prefer to buy new ones for it. After all the old ones are 33 yrs old. Any thoughts ? Thanx. Cheers !  | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | what "major problems"? especially if it's freshly rebuilt .... I went with ceramic coated block hugger headers on mine to route the exhaust the way that works best and keep things cooler in the engine compartment Bill | | | | | Joined: Dec 2007 Posts: 166 Shop Shark | | Shop Shark Joined: Dec 2007 Posts: 166 | He said they wouldn,t bolt up properly and his buddy had to search every junkyard to get others. I call bull*&% on his part, but he swore up and down this happened. I don,t see how. | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | he probably got some oddball car manifolds or even ones from a small block, big blocks aren't real common in the yards ... big block manifolds/headers fit big blocks, how they suit the particular vehicle is what counts ... there are variations in where they dump, some factory manifolds might interfere with fittings around the oil filter that varied among different vehicle models [like for oil coolers] or dump in the wrong place for a particular transmission, especially automatics, or bump a particular year/type of motor mount ... the headers fit any block and the huggers clear the mounts and are short enough you can route the head pipe any way you need to
Bill | | | | | Joined: Feb 2006 Posts: 1,867 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 1,867 | Exactly what Bill said.
The only difference I've ever noticed with old manifolds is that over time the block and manifold can warp a little with heat causing an exhaust leak. Lay a straight edge along the manifold connection on the block and if there's a gap, you might have a leak with a new manifold, or it could be planed down to flush again.
I had this happen on an old 390 and went with very thick copper exhaust gaskets to fix the problem since it wasn't worth the time an involvement in fixing it in other ways.
Jeff | | | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | Getting "454" headers "used" can be a problem. My friend is putting a hot 454 in his 53 sedan and after looking at 4 sets every set had at least one place with a crack in it. I ended up using my discount and got a eet of new ones for $154 and he is now a happy man!
Just FYI every time he found a set used the price was $75 to $125. One guy had two sets with a crack in one, but would only sell all four as a deal....3 good used headers for $125. Not much of a deal from where we were looking! | | |
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