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Thread: help with sbc 406 - 434

  1. #1
    Senior Member SENIOR BUILDER
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    help with sbc 406 - 434

    I have a Donovan 350 aluminum block 400 mains fresh 4.15 bore, problem is the block is decked 180.000? what would be my best option for 406-421-434? will 5.85 rod work? with what piston? would like 13 to 1 gas no nos, heads are AFR 227 100% factory ported, car will be 2200-2300#, 456 gear, 32 1/2" tall tire, 176 PG w/ 5000 stall. thanks for the help: BOWLER

  2. #2
    Senior Member EXPERT BUILDER
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    So is your deck height now 8.845?
    If so this motor could use a 5.85 rod and 3.75 stroke if you can find a piston with a compression height of 1.12 for whatever bore it is.
    I miscalculated in my earlier post. Sorry. ops:

  3. #3
    Senior Member SENIOR BUILDER
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    us7race

    the guy i got the block from had napa do the machine work on the block, he was building a 406 with 6"rods went to assemble it and thats how they found out it had been decked (180 thousants napa said) block had been used in a sprint car. i am going by what the machine told him. hope this helps thanks Bowler

  4. #4
    Senior Member RACING JUNKIE
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    406 AFR 227's are not enough head to make a bigger inch small block work @ its peak. I've been this route.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  5. #5
    Senior Member EXPERT BUILDER
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    Sorry ops: reread my previous post..

  6. #6
    Senior Member MASTER BUILDER
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    I have a like new set of Lunati Pro Mod Steel rods 5.850 if they would work I will make you a sweet deal on them.

  7. #7
    Quote Originally Posted by hammertime
    406 AFR 227's are not enough head to make a bigger inch small block work @ its peak. I've been this route.

    I have a 427 SBC 13.7:1 with a big 8000+rpm roller and AFR 227 heads...The engine has been 9.6-9.8 @ 139 @ 3400lbs, I think AFR 227 heads are enough head for a big SBC.

    Just my 2.5 cents

  8. #8
    Senior Member RACING JUNKIE
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    Quote Originally Posted by floritejoe
    Quote Originally Posted by hammertime
    406 AFR 227's are not enough head to make a bigger inch small block work @ its peak. I've been this route.

    I have a 427 SBC 13.7:1 with a big 8000+rpm roller and AFR 227 heads...The engine has been 9.6-9.8 @ 139 @ 3400lbs, I think AFR 227 heads are enough head for a big SBC.

    Just my 2.5 cents
    should be between 720-750 hp

  9. #9
    Senior Member RACING JUNKIE
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    Quote Originally Posted by floritejoe
    Quote Originally Posted by hammertime
    406 AFR 227's are not enough head to make a bigger inch small block work @ its peak. I've been this route.

    I have a 427 SBC 13.7:1 with a big 8000+rpm roller and AFR 227 heads...The engine has been 9.6-9.8 @ 139 @ 3400lbs, I think AFR 227 heads are enough head for a big SBC.

    Just my 2.5 cents
    Just think how good it'd run with the proper heads :P Bigger CI SB motors need better heads to work like they are capable of is what I am saying. I've had the afr 227's on a 434 ran good but surely would of ran a heck of a lot better with a better head.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  10. #10
    What do you consider a better head (without going to a raised runner or non-23 degree set-up? Just curious what you have used that runs better than 227AFRs on a 427+SBC?.... Thanks.

    Quote Originally Posted by hammertime
    Quote Originally Posted by floritejoe
    Quote Originally Posted by hammertime
    406 AFR 227's are not enough head to make a bigger inch small block work @ its peak. I've been this route.

    I have a 427 SBC 13.7:1 with a big 8000+rpm roller and AFR 227 heads...The engine has been 9.6-9.8 @ 139 @ 3400lbs, I think AFR 227 heads are enough head for a big SBC.

    Just my 2.5 cents
    Just think how good it'd run with the proper heads :P Bigger CI SB motors need better heads to work like they are capable of is what I am saying. I've had the afr 227's on a 434 ran good but surely would of ran a heck of a lot better with a better head.


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