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Old 03-08-2012, 03:54 PM
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Rebuilding My 71 402 Bb Chey

Ok Guys My Name Is Roy And Im About To Attempt A 402 Block Cheap Build If Theres Such A Thing.it Does Say Hi Pro Pass Casting #3969854 Ok Here Where Im At I Bought A 402 To Big Block And It Only Had 1 Head On It So Instead Of Tracking Down A Head .i Bought I Rebuild Set Of 396 Heads .now Heres Where I Need The Advice.the Original Heads On Was Oval Close Chamber Heads, The Set Im Useing Is 72 Model 396 Head That Open Chamber2.06 Intake 1.72exhaust And I Think There 113 Cc Open Chamber Oval Port. It Has .30 Pistons I Dont No If Thats Stock Piston , I Think There Forge. Look Like I Will Have To Replace At Least To Pistons If I Could Use Theses There Look Like A Small Type Dome Piston, But Being There Close Chamber Piston. Since Im Changing The Heads To Open Chamber Should I Change To Open Chamber One,s Im. Try To Get At Least 400 Hp.the Low Cost Way.i Have A Couple Of 660 Holly Carbs .roller Rockers.i Would Like To Change The Cam In It The Build, So What Im Asking In The Above. I Want That Little Lope In Cam. So Tell My Should I Use 1 Carb Are 2 .and With Hydro Cam Would Be Good. And What Would Be My Best Way To Go With The Pistons This Is Going In A 72 Chevy Truck Just A Little Hp. Need Thanks Hope You Can Help Because Im Very Confused Roy

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Old 03-08-2012, 04:31 PM
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It's hard to build a decent compression high flow combo with this engine.. The 72 heads are real dogs. The large chambers will kill the compression. Terrible air flow. Best bet is to try for a pair of 96-98 cc. early closed chamber heads. This will keep the compression around 10-1. Still not great flow numbers but. Have a basic 3-angle valve job with some bowl blend and short side radius blending. Then go for a high lift short to mid duration hyd camshaft.

Bigger intake valves would be great if your wallet can stand it. But, the small bore and shrouding around the valves may not be worth it on a torqy street motor..

One 750 vac carb only!
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