SBC Supercharging
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  1. #1
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    SBC Supercharging

    Hi there im after some advice on what to look out for when supercharging a small block chevy lump. I have heard talk that in order to do so the lump must have a 4 bolt crank and not a 2. My question is how can you tell which the engine has without say removing the sump??? The donor car will be a '79 camaro so before I go ahead and buy I just want to make sure im buying the right thing. Any help really appreciated

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    Rods 'n' Sods Junkie Huszarail's Avatar
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    Casting numbers will only give you a hint. 8" damper may also hint at 4 bolt main. Only sure way is take off the pan and count'em.
    My block came out of an 80's smogged up truck.
    Forged crank is nice, double keyway on the crank snout is a must.
    Figure out if you are going to do it right first time or bolt the blower on fix the breakages as you go (quite a common strategy - if expensive!!).
    Build from the ground, 4 bolt block, crank mods as above, good rods and rod bolts, blower cam, forged low comp pistons. A good foundation is best.
    Last edited by Huszarail; 29-09-2011 at 09:16.

  4. #3
    Official RnS Addict biff.bailey's Avatar
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    forged pistons and a steel crank damper are a MUST,(trust me on this one, anything more than idle WILL break a cast damper, and cast pitons WILL melt/break.) 2 bolt mains are OK, forged crank preferable but not essential unless you want to get over 600 horses
    I KNOW WHERE YOU LIVE,AND SO DOES CHUCK!

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    There is absolutely no way to tell a 2 bolt from a 4 bolt without taking the sump off. Period.
    It depends why you want the blower. Looks and the belt whine then you can go with a stock engine (but it has to be in good shape) and run it underdriven. ARP studs on a 2 bolt main are good for 500hp and probably better than stock 4 bolt bolts. Limit boost to 5-6lbs, use twin 450's or a single carb with the smaller B&M blowers and you will have a reliable 300hp engine. The '79 lump will have spot on CR for mild boost but it will be tired. Plan on rebuilding it either new and tight stock or upgrading components or you will break it just bolting a blower on. The heads should be around the 76 cc mark so again great for a blower once cleaned up.
    A mild cam will work well, in fact a 305 compucam from competition cams is the same part number as a mild bower cam from them. Go with lift in the .480" with 112-114 LSA.
    If you want more power use hypereutectics & a new cast scat crank but dont venture over 8lbs boost and again you will have a reliable engine with around 350hp.
    If you want more than that then yes you have to spend more. Forged pistons are pretty much mandatory at over 8lbs boost and the 350-400hp mark. You can still use a good cast crank but if you changing it a budget forged item like one from scat or eagle will add a measure strength as will H beam rods.
    You have to really decide what you want from this engine and be honest about it. You can build a blown engine on a tight budget as long as you don't push the envelope you have. Basically how fast can you afford to go?
    Last edited by Adam Sayers; 30-09-2011 at 06:34.
    1955-56-57 Chevy new and used parts always available from www.randrhotrodimports.co.uk who I'm proud to have sponsor my '57 Chevy race car. 9.3 @ 155.8 mph / 0-60 = 1.47 seconds! Street legal :-)

  7. #5
    Official RnS Addict rides's Avatar
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    I ran cast crank . Stock rods . Stock +30 two bolt mains .Trw blower forged pistons
    Just had it all checked and bearing clearanced I did have it fully lighten and balanced (I built it in 88 when I was 17)
    64cc cam/hump heads well ported and screw in studs.
    I never warmed it up and got on it
    I ragged it's arse all over . Run 11.4 at pod week after tunnel run
    Took it out to do car and checked it over no bearing probs
    Or wall or piston issues
    If you build it the best you can and afford ..
    And remember it could go bang
    With all the best parts in the world ...
    you be ok

    Read there's a lot of books on supercharging a small block
    Al
    Last edited by rides; 29-09-2011 at 17:07.
    My spelling is so bad spell check ant got a clue ??

  8. #6
    I'm a newbie !
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    Just want to say thanks to everyone that replied. Some great advice there from all.
    Many thanks Dan

  9. #7
    Official RnS Addict rodster's Avatar
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    ran mine stock, no probs, all depends what you plan doing with it

  10. #8
    Grumlins forTea! Russ D's Avatar
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    Real useful thread, you can't buy knowledge.
    http://www.nhrc.freeforums.net/ Light me an axle i'll be back for breakfast, (just nipping back to the 70's)

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