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Old 12-22-2004, 09:26 AM
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crank question

Would a crank out of a 010 block from a 84 van be steel or cast? And how can I tell if its a two piece rear main seal? These may be dumb questions, I hae very limited knowledge with engine internals. Thanks

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Old 12-22-2004, 09:30 AM
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probably cast twp piece. you can tell by looking at it. do you have any pics?
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Old 12-22-2004, 09:34 AM
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Should be cast iron w/ a two piece rear main seal. A way to tell the difference between a cast and forged part is by the parting line. A forged part will have a wider parting line around 1/2" or so while a cast part will have a thin line like parting line. The aftermarket utilizes cast steel but I am not aware of GM using this in sbc in the 80's.
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Old 12-22-2004, 09:39 AM
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I have a picture right here, I don't know if its big enough. If not I can go snap a close up. One more question is I have some H597CP pistons does anyone know if they are considered "domed" or "flattop" all I know is that they are soppused to give approx 9:1 compression with a 74cc head Thanks for your help guys..
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Old 12-22-2004, 09:44 AM
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Can't tell from the picture...a close up of the parting line on the crank and I should be able to tell. I don't know about the pistons based on the part # but you should be able to tell about the flat top vs. domed by looking at them.
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Old 12-22-2004, 10:00 AM
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here is a close up. I assume this is the parting line?
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Old 12-22-2004, 10:20 AM
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The parting line is the line in the casting where the two halves of the mold came together. In your picture it looks to be just visible under the raised lettering on the left side of the pic. If you were to rotate the crank about 45 deg up from where you have it I think it would be directly facing the screen as I'm looking at it. Looks to me like a cast iron crank judging from that parting line if that is it. You can take another pic if you want but I'm 99.99% sure that's a cast iron crank.
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Old 12-22-2004, 10:32 AM
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thanks very much for all your help. And thank you for not making me feel like an idiot..
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Old 12-22-2004, 02:49 PM
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The H597CP pistons are flat-top pistons. They will give you around 8.4:1, depending on deck clearance.

tom
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