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Thread: which cylinder heads for a 421

  1. #1

    which cylinder heads for a 421

    wondering which cylinder heads i should use for my 421 i have a set of track 1 heads but the intake runners are small.for the cost of porting i could buy a set of heads that will flow

  2. #2
    Senior Member RACING JUNKIE jmarksdragster's Avatar
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    If you want a quality 23˚*head call Chad. He can set you up with the castings and runners that will suit what you have best, and the best head if you want to maintain your current rocker hardware.
    http://www.SpeierRacingHeads.com/

    If you want something better such as 18˚ or 15˚ heads, SB2's, or some other higher end head give Curtis at Race Flow Development a call.
    http://www.raceflowdevelopment.com/
    Mark Whitener
    http://racingfuelsystems.myfunforum.org
    __________

    Good work isn't cheap, and cheap work can't be good.

  3. #3

    Re: which cylinder heads for a 421

    Quote Originally Posted by scott0408
    wondering which cylinder heads i should use for my 421 i have a set of track 1 heads but the intake runners are small.for the cost of porting i could buy a set of heads that will flow
    It depends on how much someone charges for porting, for what I charge to port heads porting your heads is more economical.

    Eric Weingartner

  4. #4
    Senior Member EXPERT BUILDER
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    Re: which cylinder heads for a 421

    Quote Originally Posted by scott0408
    wondering which cylinder heads i should use for my 421 i have a set of track 1 heads but the intake runners are small.for the cost of porting i could buy a set of heads that will flow
    We have a pump gas 421 in shop and are going to use the AFR 220's and we are looking for a low 600 number on the dyno.
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  5. #5
    Senior Member DYNO OPERATOR
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    Which

    I built a friend a 13:1 421" SBC and used PRO TOPLINE/RHS 235 aluminum heads with no porting. .690" lift cam.

    At 2850# it runs 5.90s in 1/8.

    You almost need offset rockers on intake valves with these heads, but with adjustable guide plates you can manage no offset if you accept a slight off center on the valve stem. No problems in 2 seasons.

  6. #6
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    Go for the SB4.1 heads!
    http://www.cferacing.com/?pid=69

  7. #7
    Senior Member MASTER BUILDER
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    Depends on your Budget, but the AFR 220s would be our first choice
    Competition Engines & Hardcore Engine Parts
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