421 stroker Header advice
#1
421 stroker Header advice
My 421 is just about done. Right now I have the hawks 1 3/4 long tubes with 2 1/2 collector. Im thinking the collector is about 1/2 to small. Been reading alot into primary size and it seems the 1 3/4 inch should be fine considering my rpm redline is in the lower 6000s. They do offer the same header with a 3 inch collector. Hp should be around 600 crank. Nitrous is an option. Thanks
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Car: 1985 firebird
Engine: 360"sbc NA pump gas
Transmission: Th350 manual valve body
Axle/Gears: Moser 12 bolt 4.11:1
Re: 421 stroker Header advice
Have doug's long tube 1.75" and 3" collectors ceramic coated on mine. From jegs I believe
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Car: Z/28
Engine: 355
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Re: 421 stroker Header advice
my guess would be that 1-3/4 primary tubes will be to small for that size engine to start with. If or when you add nitrous, it will get much worse. try a stepped header 1-7/8-2.0 primary with at least a 3" collector. Oh bring lots of $$ for headers if you decide to change up in size.
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