Speaking of headers... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**COBALT** · 10-22-2002, 01:54 PM

My exhaust manifolds are in rough shape, and I thought about yanking them off and putting headers on with new exhaust back to the turbo mufflers. The exhaust pipes from the manifold flanges down to the mufflers are about to turn to dust and float away. I have stock '80 350 heads, so the exhaust ports aren't huge or anything.

1. If I did decide to go in this direction what size headers for SBC should I get?

2. Do I need to yank the manifolds and measure the ports before I think about getting some headers?

3. What's worked for everyone else?

4. Is this even worth it? Maybe I should just yank/cut the old exhaust ahead of the mufflers out and have new pipes welded in.

crazy longhorn · 10-22-2002, 02:23 PM

I would go with a 1 1/2 to 1 5/8" primary tube, you shouldnt have to measure the ports. i run 1 5/8 on my longhorn,& have used them on anything from a stock 350, to my 383, & have run both Hedman &Hooker. i like the Hooker comps, for fit,nice position of the collectors,& the heavier construction. good luck.....crazy AL

10-22-2002, 01:54 PM	#1
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	Speaking of headers... My exhaust manifolds are in rough shape, and I thought about yanking them off and putting headers on with new exhaust back to the turbo mufflers. The exhaust pipes from the manifold flanges down to the mufflers are about to turn to dust and float away. I have stock '80 350 heads, so the exhaust ports aren't huge or anything. 1. If I did decide to go in this direction what size headers for SBC should I get? 2. Do I need to yank the manifolds and measure the ports before I think about getting some headers? 3. What's worked for everyone else? 4. Is this even worth it? Maybe I should just yank/cut the old exhaust ahead of the mufflers out and have new pipes welded in. __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

10-22-2002, 02:23 PM	#2
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	I would go with a 1 1/2 to 1 5/8" primary tube, you shouldnt have to measure the ports. i run 1 5/8 on my longhorn,& have used them on anything from a stock 350, to my 383, & have run both Hedman &Hooker. i like the Hooker comps, for fit,nice position of the collectors,& the heavier construction. good luck.....crazy AL



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