I'd just port match at the manifold/head (make sure manifold is slightly larger at all points for anti-reversion ledge) and use a sanding-flap wheel to smooth things out............

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Here is the price list I went off of http://www.gethoned.com/parts.php?get_p ... automotive

There may be cheaper places out there but I bookmarked the site because the little pictures of the process are mesmerizing

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Chris'
Autobody
Restoration
Service

I am with emsvitil, for a street car build. Make sure the gasket matching is done the way he explained, from the intake to the head, the head being right at the gasket size, the intake being a little smaller to reduce reversion. On the the exhaust, make sure the exhaust manifold is gasket matched and leave the head alone, or if you do port it leave it a little smaller to reduce reversion.

I cleaned up inside the exhaust as far as I could reach and reamed it out, cleaned out the ridges, bumps, etc.....you don't need to go crazy, but a general clean up sure makes a big difference. I was running my exhaust manifold stock up until about a month ago when I put on the Aussie Carbon fiber manifold gasket. Then I gasket matched it and cleaned up a bit. It has more zip (faster response) around 2500 rpm on up.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Thanks everyone for the replies. If the stock exh. manifold is only good for about 4000 rpm, it sounds like making even 150 hp would be tough, as that would require 197 ft/lb at 4000 rpms.

You can make much more than 150hp with the stock manifold. The head is where the power is.

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Yeah....Im the one who destroyed this rare, vintage automobile.....

MikeY,

With the mods I have made on my build Doctor Dodge says I should be a 160 HP with the Single barrel Holley. I am very happy with the performance output.

A stock motor puts out 200 ft pounds of torque at 2000 rpms and about a 100 to 148 HP depending on the year and carb and the way they used to measure output. So the stock manifolds aren't that bad for a street car. Doctor Dodges Split manifolds are the next step to take.

PM me your email and I will send you a output chart.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG