Trying to find correct header primary size

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Trying to find correct header primary size

Post  Dwoodside on June 8th 2014, 8:38 pm

Looking to build a custom set of headers for my a-headed 521 nitrous motor. I know ppl have different ways of figuring the correct primary size. Just wanted some input. Thanks.

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Re: Trying to find correct header primary size

Post  powerstrokeace on June 8th 2014, 9:28 pm

2 1/4 - 2 3/8 likely. I have a set of 2 3/8 stepped to 2 1/2. I'll be swapping them out for a 2 1/4 stepped to 2 3/8


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Re: Trying to find correct header primary size

Post  whatbumper on June 8th 2014, 10:15 pm

How much nitrous? My definition of nitrous motor may be different.

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Re: Trying to find correct header primary size

Post  rmcomprandy on June 9th 2014, 12:14 am

Dwoodside wrote:Looking to build a custom set of headers for my a-headed 521 nitrous motor. I know ppl have different ways of figuring the correct primary size. Just wanted some input. Thanks.

It will depend upon more than just engine size and NA or not.

RPM range wanted is the biggest - nitrous ONLY or NA with sometimes nitrous and exhaust camshaft duration are other parameters to satisfy.

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Re: Trying to find correct header primary size

Post  Copperhead on June 9th 2014, 9:17 am

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