455 exhaust manifolds

citcapp · November 25th, 2007, 03:11 PM

I have been told that I can use a set of 350 diesel exhaust headers on my 455 engine and they will perform as well as the W30 exhaust manifolds. Is this true

Thanks for the help

joe_padavano · November 25th, 2007, 07:29 PM

Quote:

Originally Posted by citcapp

I have been told that I can use a set of 350 diesel exhaust headers on my 455 engine and they will perform as well as the W30 exhaust manifolds. Is this true

Thanks for the help

Nope.

citcapp · November 26th, 2007, 08:16 AM

Thanks for the answer, its always great to get correct information.

joe_padavano · November 26th, 2007, 08:54 AM

Just to elaborate on this a little, the W/Z manifolds used on the W-30s (and ALL 442s for 69-72) have individual runners like cast iron headers. The diesel manifolds are open log manifolds and since they must fit the small block, are also smaller and more restrictive.

November 25th, 2007, 03:11 PM	#1 (permalink)
citcapp Super Moderator Join Date: Nov 2007 Location: Bothell, WA Posts: 3,445	455 exhaust manifolds I have been told that I can use a set of 350 diesel exhaust headers on my 455 engine and they will perform as well as the W30 exhaust manifolds. Is this true Thanks for the help

November 26th, 2007, 08:16 AM	#3 (permalink)
citcapp Super Moderator Join Date: Nov 2007 Location: Bothell, WA Posts: 3,445	455 exhaust headers Thanks for the answer, its always great to get correct information.

November 26th, 2007, 08:54 AM	#4 (permalink)
joe_padavano Super Moderator Join Date: Mar 2007 Location: Northern VA Posts: 4,397	Just to elaborate on this a little, the W/Z manifolds used on the W-30s (and ALL 442s for 69-72) have individual runners like cast iron headers. The diesel manifolds are open log manifolds and since they must fit the small block, are also smaller and more restrictive. __________________ Joe Padavano 64 Jetstar 88 Conv 66 442 L-69 Conv 68 W-30 69 H/O 69 442 70 W-30 72 442 84 Custom Cruiser 86 Caprice wagon (w/307 Olds)

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