Header upgrade

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MOPAROFFICIAL said:
I may have already replied to this but I don't think you're going to see 20 horsepower going from a header to a slightly bigger header. Especially with 3" exh already, i look else where.
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I gave up on the idea. I’m saving money for a whole different engine instead.
 
Decades ago when the first generation 360 crate motor came out, foggy memory says that "High Performance Mopar" magazine did a test on the crate motor starting with manifolds then 1 5/8, 1 3/4, and 17/8 headers. The engine picked up power everywhere in the curve at each dyno pull, topping out at 390 hp using the 1 7/8 headers, again this is foggy memory.......so my suggestion would be to put the 1 7/8 TTi's on and let it rip
 
MOPAROFFICIAL said:
I may have already replied to this but I don't think you're going to see 20 horsepower going from a header to a slightly bigger header. Especially with 3" exh already, i look else where.
Click to expand...

When I was building my 408 Ryan Johnson freshened up my Edelbrock heads. He and I were talking on the phone about the build and I mentioned headers and that all I had were a set of 1 5/8- 1 3/4" TTI's off my 340 but was considering their 1 3/4" "race" header. He told me to buy a set of Hedman 1 7/8" with the 3 1/2" collector. Ryan said on builds similar to mine that he had seen over 30HP gain on the dyno over the 1 3/4" TTI's. I bought them and haven't needed a better header yet, I have wondered if a 2" Hedman would be better on the 434 though.

Good headers are expensive, IIRC my Hedmans were around $650, plus another $350 or so to ceramic coat them inside and out. Building engines that make some steam are expensive, so why use a cheap header or one that will hold it back?

Just my thoughts, this and $1.75 will buy you a cup of coffee in some places.
 
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justinp61 said:
When I was building my 408 Ryan Johnson freshened up my Edelbrock heads. He and I were talking on the phone about the build and I mentioned headers and that all I had were a set of 1 5/8- 1 3/4" TTI's off my 340 but was considering their 1 3/4" "race" header. He told me to buy a set of Hedman 1 7/8" with the 3 1/2" collector. Ryan said on builds similar to mine that he had seen over 30HP gain on the dyno over the 1 3/4" TTI's. I bought them and haven't needed a better header yet, I have wondered if a 2" Hedman would be better on the 434 though.

Good headers are expensive, IIRC my Hedmans were around $650, plus another $350 or so to ceramic coat them inside and out. Building engines that make some steam are expensive, so why use a cheap header or one that will hold it back?

Just my thoughts, this and $1.75 will buy you a cup of coffee in some places.
Click to expand...


Exactly.
 
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