General Category > Early Chevy/GM Discussion

header wrap

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sammons:
I've used it, but only where heat burn next to a component is needed protected. Personally don't like the look of heat wrap though. Never used it to increase performance so I can't answer to that. That article seems to have a lot of half truths in my opinion. I would personally like to see the effects of a new set of headers after 500 miles @8-9k rpm with header wrap vs  bare, (same tubing, same header) I highly doubt that all that holds it together after the race is the wrap. Only 10hrs use on bare header loses 25% metal, Christ how did I make it to California and back ;D      Just my observations and curiosity, i'm no engineer nor have I ran tests on the matter.

I've seen new Hooker headers rust out in a year at the collecter(painted), yet a cheap set of Blackjacks last 15yrs.  A friend had a set of Headmans on his 69 Chevelle sbc for 3-4 years before swaping out for a 396. They where "wrapped" , surprisingly clean when the wrap came off. He lightly hand sanded and repainted, sold them at swap meet.

No doubt ceramic coated works for a long time and is expensive. Wrap is cooler to the touch however.   
Mike what are these sidepipes and what are they on?  Like Rattiac said, the JC Whittney/ (Speedway/Rocket etc)type screen cover works good. Hooker Show tubes on the old Vettes and Camaros would burn the hyde of your legs in an instant!  Usually happened to the girlfriend in shorts.

madmike3435:
I believe the guy who was offering the 50 ft of the stuff , had it on his 65 corvette SBC 365 hp- with factory side pipes.

He really felt the heat with the wrap on and also the sills got really hot also.   He used a thermometer gun to record the temps, before removing it, the wrap.

I liked what the reviewer had to say in the posted link, MOOSIE posted

mike    8)

sammons:

--- Quote from: madmike3435 on September 26, 2017, 04:59:28 PM ---I believe the guy who was offering the 50 ft of the stuff , had it on his 65 corvette SBC 365 hp- with factory side pipes.

He really felt the heat with the wrap on and also the sills got really hot also.   He used a thermometer gun to record the temps, before removing it, the wrap.

I liked what the reviewer had to say in the posted link, MOOSIE posted

mike    8)

--- End quote ---

Mike his application would increase muffler temps.  He probably started the wrap just below the exhaust manifold to the last turnout to muffler? All that heat held in the wrapped area is not being disipated by the time it hits the muffler, now being disipated starting there. All the older Vettes were notorious for under hood/floor heat. If he was trying to keep the heat out of the pass compartment, a heat shield under the floor pan (I know C3s had them) and more insulation under the carpet are your best bet. (And there still hot)   Dad had a 65 same equipped and a 66 same except standard exhaust. The 65 might have been a tad cooler on the floor pan. I cant remember if they were a fiberglass cover, I know my '69 had factory sidepipes and had fiberglass side covers, never got that hot to burn or touch.

Repeat, I do not like the looks even if wrap works. Every situation, cars are different to your needs.  It does have its place.

The first time I read that article(?) 10+ years ago, I took it as just an advertisement for Jet Hot Coatings. You know, buy our product because it's better than anything out there. ;D  I've seen it reposted (minus some, plus some added by individual posters and figures have a to very  ;))

Rattiac:
Army hummers have these shields. The X metal stuff.
https://goo.gl/images/wL28jU

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