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Post by RIP OLDS on Feb 4, 2016 20:20:29 GMT -5
Is this something worth doing for my new 400 with a stock spec cam and stock manifolds?
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Post by bubbasz1 on Feb 5, 2016 6:32:39 GMT -5
Probably not, Just make sure the gaskets fit well over the ports and get on with life.
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Post by sascha on Feb 5, 2016 18:36:36 GMT -5
The best running cars I worked on have always been those with a matching setup. If you use a stock cam in a 400 I would definitely recommend not to move away to far from a stock intake and heads. For a street car, using the stock cam, I would stay very conservative. What might be a choice to consider is the old O4B Edelbrock intake, as far as I remember there are versions of it that would fit the shape of the 65 4Jet carburetor very well, you save some weight, and the intake is not as high as a performer. But since the cam has not a lot of lift, I do not see any benefit from head porting. A decent clean up for the heads and checkin out that you have all 8 chambers exactly the same volume, but that`s more like blue printing than porting.
I am sure your 400 will run at it`s best in stock form. One thing you really have to consider is the compression ratio. Because if you use the common felpro gasket, you will end up with a compression ratio of 9:1 (may be even less) even if you use 10:1 pistons because your gasket is so much thicker than the original obsolete metal gasket. So, using the thinnest gasket you can get hold of and go for your original compression ratio is the way to go. Cometic gaskets, or if you can get the old original ones. I run my cars with 10,5:1 and 95 pump gas, runs fine.
But if you loose compression, your performance is gone and is going to be even worse with ported heads and a different intake.
Sascha
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