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Old 08-25-2004, 06:34 PM
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402 Bb Chevy

I HAVE A 1972 402 BB CHEVY ENGINE BLOCK #3999290 AND HEAD # 3999241 OVAL PORT I WAS WONDERING IF THAT MOTOR WOULD MAKE 500 +HP I WAS TOLD I COULD CHANGE THE HEADS AND GET BETTER PERFORMANCE I WANT IT TO RUN ON PUMPED GAS. I ALREADY HAVE A CAM 292 550 LIFT, ALUM INTAKE, MSD IGN, HEADERS, 1 CHAMBER FLO MASTERS, 850 DOUBLE PUMPER HOLLEY, WHAT ELSE WOULD I NEED PLEASE HELP I ALSO HAVE A BUDDY WITH SOME 454 RECTANGULAR STEEL HEADS WOULD THAT BE A GOOD HEAD IM SHOOTING FOR A 7.50 1/8 MILE CAR FOR THE STREET

ROBBY

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Old 08-25-2004, 10:49 PM
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402

Robbie, always remember that your entire car must be integrated and matched for it's specific purpose. The 72 402's had some pretty good flowing heads for oval ports and will make better low speed torque, and can be worked over a little to perform well.

The basic engine you have has all of the basic goodies you need to achieve 7.50 1/8 mile times.

I would think about rasing the stock compression ratio. If you don't mind using race gas, or a pump-race gas blend, I would probably bump it to at least 11.5:1, and that is going to mean a piston change. I would enlarge the valve size to 2.19" intake and 1.88" exhaust. I would pocket port the bowl areas and have a top quality competition valve job performed. Your camshaft will work, but is probably not the most up to date profile to use. Cam, compression, vehicle weight , transmission and gear ratio all go hand in hand. I use alot of camshaft products from lazer cams. You can get really good one on one advice from a real cam professional. The rest of the stuff you have listed will get the job done, you have enough carburetion. Head work, increased compression, and the proper gear ratio and stall speed (if automatic) are going to dictate how successful you are.

You can give more details of your combination if you would like a more detailed analysis.


Brian
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