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Thread: RECOMMEND A HEAD FOR A 434 SBC 15 OR 18 DEGREE HEAD

  1. #1
    Senior Member SENIOR BUILDER
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    RECOMMEND A HEAD FOR A 434 SBC 15 OR 18 DEGREE HEAD

    LOOKING TO CHANGE TO A 18 OR 15? DEGREE SBC HEADS, BRODIX, DART, TRICK FLOW OR? MY COMBO IS 434" 23 DEGREE CHAD SPEIRE PORTED HEADS, 13.88 TO 1, AT 2440# RAN HIGH 9.30'S WOULD LIKE TO RUN HIGH 8'S, WOULD LIKE TO RUN 14 TO 1 COMPRESSION AND 1050 DOMINATOR ANY HELP WOULD BE APPRECIATED. DOUG

  2. #2
    Senior Member DYNO OPERATOR
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    Recommend

    I recommend a 496 BBC.

  3. #3
    Senior Member SENIOR BUILDER
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    434 vs 496

    hey Mark, 434 for sale wanted bbc 496!!!

  4. #4
    Senior Member RACING JUNKIE
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    Doug, i a little bias but i like Brodix 18's, but almost everyone's 18 degree seem to flow about the same CC'ed, about 370 CFM. Brodix told me a couple yrs. ago with hand massaging it's possible to get around 395 CFM. There was also a head porter in Mo. that uss step down to 3/8" studs that claimed to get 430 CFM with the Brodix, Cost about $3500.00 complete.
    I know you can make 850/900 HP with the 18* heads, perhaps a 100 HP more than 23* heads. You can also go bigger than a 1050 dom with them.

    the car below is a local car and a friend of mine i've seen the car 5.18 in the 1/8 mi. which translates to mid to low 8's. But it has SB2.2 type heads on it. It weighs about 2300 lbs and is an all tube car. It also has a 1250 dom. on it.
    I don't know how much HP he's making but it's a real hand full to drive.

    JMO

    Zip.


  5. #5
    Senior Member DYNO OPERATOR bixblk's Avatar
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    if you really are going BBC

    Selling a BBC
    Got a great deal on a BBC 496
    check out ad 2800825
    let me know
    jeff 708-308-0282

  6. #6
    Senior Member SENIOR BUILDER
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    434

    Zip i'am leaning towards brodix 18 as i could use my t&d rockers w/ new bars, i was wondering what everyone thought about other heads. Thanks Doug

  7. #7
    Senior Member RACING JUNKIE
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    Doug i suppose you already know that you will need .180 offset lifters. i have Brodix 10 FP, RP's with 2.150 (tit) valves and T&D rockers mine are offset .250 and i have to use the .180 offset lifters. I think the rockers are offset .750 on the 18* heads. I'd almost bet that Chad Speire could get them to around 400 CFM. O'h and the largest pushrods is 5/16" due to clearance atleast on my Brodix 10's. I've got .726 lift with 1.6 rockers, but my heads only flow 328 CFM @.600

    Zip.

  8. #8
    Senior Member SENIOR BUILDER
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    18x

    Zip my T&D shaft rockers are the same (offset) as used on Brodix 18x just different bars, and i have .180 offset lifters so if i stay with the 18x i could use my rockers if i find a set of 15's or other brand 18's they would have to have shaft rockers. Doug

  9. #9
    Senior Member RACING JUNKIE
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    I'm pretty sure you'll have to change the pistons also. I don't know how much advantage would come from 18* to 15* heads, maybe a call to Brodix and they could tell you. Either way i'm thinking around a 100 HP increas which should easily get you into the 8's.

    Zip.

  10. #10
    Senior Member MASTER BUILDER
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    Doug,The 18c is a better head than the 18x,especially on a big motor.I have a 412 motor with 10 yr old edelbrock victor 18 heads done by Chapman.I never tried any of the other 18 heads but at 3100 lbs on 10 inch tires my car has run 1.35 60,5.99 115.65 1/8 9.38 114.97 1/4.Comp 14.4 to 1 850 carb,T&D rockers 5.50 offset in 1.70 offset ex.


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