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01-05-2019, 09:19 PM | #11 |
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Re: Chevy OE cranks, cyl. heads.
Billy, My buddies at Brodix tell me that as their Core boxes wear the port is cast smaller.
I was questioning them one day about their advertisement for port size and flow. I told them that what I buy never matches the advertised size and flow. Dave Roder told me it was because all the ads are done off the first production run and as they pour/cast more heads the ports get smaller. I'm no foundry expert so I just shut up and accepted the explanation. Probably what they wanted me to do, LoL. I would bet that the GM X means the mold/core box was modified. If the X was for worn out why would they be using them? No doubt the X castings I've seen always seem to have more intake volume.
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Adger Smith (Former SS) |
01-06-2019, 09:32 AM | #12 | |
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Re: Chevy OE cranks, cyl. heads.
Quote:
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01-07-2019, 04:07 PM | #13 |
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Re: Chevy OE cranks, cyl. heads.
Dwight, according to the source below and other sources the 461 and 461X casting numbers date back to 1961 (first 327 engines).
http://www.corvetteactioncenter.com/...gines-286.html http://www.chevytech.com/3c3782461.html |
01-16-2019, 04:54 PM | #14 |
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Re: Chevy OE cranks, cyl. heads.
Interesting,
No 22542525 heads on the list. Olds Nascar head/
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Adger Smith (Former SS) |
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