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Old 01-24-2003, 11:32 AM
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I have finally decided on how I plan to rebuild my 400 Chevy. Definately will be using the Holly/ Weind 142 Baby blower. But this will require low compression forged pistons. And I will use Dart 72CC heads...lower combustion also. So, I just took off my old GM heads and find this engine has some strange looking pistons in it. Attached URL. It almost seems these might be inverted domes and I might not need to buy new pistons. Since I won't be adding the blower until next year, I surely didn't want to take the crank out yet...nor did I want to remove the short block yet. So, can anyone identify the pistons in the picture below....
Thanks
Pc

]

[ January 24, 2003: Message edited by: pcesak ]

[ January 24, 2003: Message edited by: pcesak ]</p>

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Old 01-24-2003, 11:47 AM
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They look like the stock Chevy cast dished pistons. And it's hard to tell from this angle, but it looks like there's a fairly large ridge at the top of your bores. If you do put a blower on that short block as is, don't expect it to last very long, and do carry an extra case of oil with you wherever you go.
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Old 01-24-2003, 11:56 AM
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I don't plan on ading the blower until I get the following equipment first....Number one on the list is Dart Alluminum heads...72CC 2.02/160. Forged 75/1 Pistons.030 over, Steel Crank, H rods and Moly rings. But until aI save that much moola, I'll just go with the Darts first and but the rest next commission check. I also used a real crude set of calipers...can't find my good ones and measured the bore to be 4.1574" . Stock?

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Pc

[ January 24, 2003: Message edited by: pcesak ]</p>
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Old 01-24-2003, 12:21 PM
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Found the good calipers....actual 4.147" diameter bore.
Stock? Where might I go to find the exact bore...ah maybe my Motor's manual...nope not there. Any ideas?
Thanks
Pc
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Old 01-24-2003, 12:51 PM
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4.125 is stock and bore to .030 over puts it at 4.155 as long as it will clean up and be straight with .030.

Do not use those pistons with a blower. You will not anyway if the cyl is worn that much. Buy some forged pistons.
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Old 01-24-2003, 01:51 PM
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Those pistons look like my stock 400 ones with no vavle reliefs... also you need to machine that block... clean it all up... since you don't wanna destroy the thing when you put a blower on it... in which case just buy the forged pistons... have the thing align bored, balanced, the whole works.. that way you will be safe and the engine should last for a while
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Old 01-25-2003, 05:35 AM
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those pistons are probably .020 oversize rebuilders pistons,probably silvo-lite or badgers.
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