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Thread: Advice on Cylinder Heads

  1. #1

    Advice on Cylinder Heads

    I looking for some advice on which cylinder heads to run or if I already have the correct one's or not. The car is a street/strip car that see more "streetracing" than track time. I only go to the track once or twice a year. The specs are below...

    Engine:
    GM Block 496cu. in. (4.31x4.25)
    6.385 Rods
    JE SRP 8.5:1 Pistons (135psi cranking)
    Cam is a solid roller 255/262@50 .653/.653 114
    Pro 1 325 Heads
    Jesel shaftmounts
    Dart 4150 Rec. Intake
    C&S 900cfm Blow-thru carb
    Procharger F2 (17psi)
    Non-Intercooled
    Headers are 2 3/8" Primaries / 4" Collector
    Exhaust will either be 3 1/2" or 4"
    C16 racing gas

    Car:
    1973 Camaro
    3500lbs. with driver
    4.88 gears
    33x18.5x15 ET Streets
    TH400 Trans
    9" Converter 4500 Stall

  2. #2
    Member JUNIOR BUILDER
    Join Date
    Aug 2007
    Location
    Bedford, Ohio
    Posts
    86
    I don't know about the heads but wondering why you are burning C16? I would think unless your running Nitrous, C12 would be fine for your compression and boost. What do your plugs look like at the end of the day?
    Are you just being xtra careful about detonation?

  3. #3
    Quote Originally Posted by davebat
    I don't know about the heads but wondering why you are burning C16? I would think unless your running Nitrous, C12 would be fine for your compression and boost. What do your plugs look like at the end of the day?
    Are you just being xtra careful about detonation?
    I'm probably just being extra careful. I have run both C12 & 110 Sunoco with no problems. Never really looked at the plugs because I have an LM-1 which always reads around 11.5 WOT

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    May 2003
    Location
    Coldwater, MI
    Posts
    2,998
    I agree on the on the C16 Over Kill, 110 is plenty.
    Them heads are not bad heads at all, I've seen them used on 555's with some port work and work just as good as some Dart 355's.
    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
    Member JUNIOR BUILDER
    Join Date
    Jul 2004
    Location
    Clawson, Mi.
    Posts
    72

    fuel rating/heads

    I'm with Hammertime here also, those heads flow plenty for your cuin. just cut back on the fuel rating and hang them hoops. You may want to read your plugs after a hard race sometime, just cut the engine off and coast and bring your plug tools, pull a couple and see what they look like, obviously they should be a nice gray color and dry if all is well. Good luck with your combo.

    Elkyman
    Being different is the difference between us all.
    Rest in Peace my friend Doug Cunningham 1963-2008

  6. #6
    Thanks guys, my only concern about the heads was because of the procharger & 17psi. I see alot of procharged 540's with 355 heads so I wasn't sure if I should have gone with 355's or 345's. Do you guy's think the next time I rip the engine down I should change them to the bigger head or stay with what I have?

  7. #7
    Quote Originally Posted by RaceReadyRacing
    Thanks guys, my only concern about the heads was because of the procharger & 17psi. I see alot of procharged 540's with 355 heads so I wasn't sure if I should have gone with 355's or 345's. Do you guy's think the next time I rip the engine down I should change them to the bigger head or stay with what I have?
    Just make sure you don't use too much octane...lol.

  8. #8
    Member MASTER JOURNEYMAN
    Join Date
    Apr 2003
    Location
    Fenton MI
    Posts
    38
    If anything, when you tear it down, get a good port job on the heads you have now. That will open them up a little, but the port work should really pick things up.

    Adam


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