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Old 04-20-2011, 04:47 AM
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Chevy BB 402 build up

Hi community,
in the past you helped me with a lot of problems. That was so great. Here is my new wish: at the weekend I bought a completely remanufactured chevy 454. Nothing big. Will run in my Camaro. Price was very fair.

The seller had another BBC engine there and I could not dispute.

It is a 402 Chevy BB. He said it is out of a 70's Chevelle. It runs fine, but is burning oil. So I have to rebuild it. Last night I decided to tickle more power from that engine.

So my question is, what can I do, to make a great engine from that? Are ~500hp or more ralistic w/o supercharger? Build a stroker? What parts should I need?

The only numbers I have at the moment are from the engine (3999290) and from the heads (6272292).

Best regards...Daniel

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Old 04-20-2011, 05:12 AM
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454

Stick with the 454. Both are BB. Almost every part, excluding the crank, are interchangeable. So there is no cost savings in buying parts for the 402, which is just a .030 over 396. There is no replacement for displacement.
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Old 04-20-2011, 01:07 PM
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Maybe we missunderstood. I got both engines and I want to build up the 402 for a rat car / dirt car or something like that. My Maro gets the 454. The 402 is for fun and learning effect only.

So when the blocks are the same, what would be a good upgrade for this engine? Is there a payable 502 stroker kit or something like that?
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Old 04-20-2011, 04:33 PM
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The 402 has a 3.76 stroke an a smaller bore than the 454.

The 454 is a 4.00 stroke with a 4.250 bore.


They are made on the same principle but with different parts.

The 3.76 stroke crank an a 454 block (4.250) will give you a 427.
There is not much you can change without going to a different block. Unless you just wanted to build the 402.
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Old 04-20-2011, 07:37 PM
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My "Maro"?!?!?!??!?!?!?!?!?!?!?!? Please stop that. It is an insult to all of us Camaro owners. It is as ridiculous as one of the magazines that insists that calling a Chevelle a "Velle" is cool. Cut it out. Please.
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Old 04-20-2011, 10:33 PM
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Probe makes a 30cc dome piston. With some 112cc open chamber heads (like maybe some 049's decked down to 112), zero deck and 4.125" bore, you would be right at 10.0:1. Use a cam something like this solid flat tappet cam with EDM machined lifters to spit oil directly onto the lobes from the bottom of the lifter housing.
http://www.summitracing.com/parts/ISK-396266/
http://www.probeindustries.com/Chevy...ons_s/1026.htm
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