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i know that i've seen the exhaust heat plate available from someone, can't seem to remember where. i want an exhaust heat plate not hot water....can someone point me to the correct vendor?..........thanks

Patricks in Arizona has what you want.
http://www.patricksantiquecars.com/

Bob

I've got a question on this. I've heard that the exhaust heat plate doesn't work well and that you need a hot water kit. This is the way "the man" explained it: since the pressure in both manifolds is positive, there is no exhaust flowing through the plate, the only heat you get is radiated heat through the copper tubes. Anybody out there running one of these care to comment?

I am running exhaust heat to my manifold for about 3 years now and it works very well.
We get triple-digit and freezing temps alike and I don't have to use carb insulation spacers with the aluminum intake either.

The exhaust DOES flow through the manifold bottom, because only one exhaust valve is open at any time.
A small portion of the exhaust pulse can flow and exit into the other header, which has all exhaust valves closed at the same time.


There is actually one vendor who sells a heatplate with only one connection - no flow there....

Ditto on it works! I've used an infared thermometer with both no manifold heat and with the exhaust gas heat. However, the stock and Offy 2x1 intake have 2 chambers and I found to optimize even heating, I had to grind down the casting between them.

Being that the Offy manifold has a tendency to leak water unless modified, I think the exhaust gas heat offers less potential for problems.

I've got a couple pics of the simple plumbing for the exhaust gas setup in my Webshots "Shoebox" on page 9. Hope this helps.

Thanks guys; Good info! I think maybe someone was trying to sell me a hot water kit.

Waldo, I made my own hot water kit. The lines are 5/16" brake lines I used from NAPA. The fittings came from there as well. Bent them with a $10. tubing bender and painted them with Chevy Duty high temp "stainless". My neighbor loaned me a swaging/flaring set and showed me how to use it. I utilized a 261 thermostat housing and waterpump to circulate the water through the intake as suggested by 4onthe floor, another Stovebolt member. The heat plate itself started as a 5/16" thick piece of steel that was 4" X 5". I used a hacksaw and a vice to trim it and a bench grinder to shape it to match the curves and angles of the intake. I was again fortunate to have my neighbor drill and thread the holes for the fittings. Check out my pics on the link below. P.S. I believe exhaust heat would actually work faster. I have been told by someone with experience however that exhaust heat can "carbonize" an aluminum intake. Should work fine for the original cast iron type though. Also, theoretically, water heat can keep the intake(especially aluminum ones) from getting too hot, resulting in better performance and gas mileage.

bigmacdaddy; That's most definitely the best looking hot water set-up I've seen so far. Nice job. What about the gasket between the plate and the manifold, it has to be water-tight right?

Hey tell that young man in the photo sequence to get rid of that F**d and stick with Chev/GMC, that way he won't have to push it around!

I used black rtv sealant with the gasket that usually goes between the intake and the exhaust manifold. It weeped a little at first but doesn't anymore after gradually tightening it a little more.

i got mine from langdons in michigan and i use manifold heat and it has work well for about a year. pictures in my webshots. not pretty but works. ron