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Old 08-28-17, 09:36PM   #136
turbo louie
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Originally Posted by Dragncar View Post
You could find a set of 70 12s, they are 67 ccs. 350 HOs are 65.5 ccs. You could mill them .060 and get real CR. I had 400 48s and they were 70ccs. I have another set, do not know if they came off of a 350 or 400.
Good to know. Thanks
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Old 08-28-17, 09:37PM   #137
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Heres my iron #13 headed 455, Ross flat tops and heads milled to 62cc, stock crank and eagle rods. It ran 10.40s over 129 and the car was all steel then, I only had 3800. in the motor and I ported the heads and built the motor myself. After about 150 passes the stock crank broke and took out the short block. I wont use stock cranks anymore. lol I used stock length
valves and used offset keepers and retainers to get a 1.68 to 1.70 installed height. https://youtu.be/X1eowjSwr-o
How much did you mill off to get it down to 62 cc's?
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Old 08-28-17, 09:38PM   #138
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Heres my iron #13 headed 455, Ross flat tops and heads milled to 62cc, stock crank and eagle rods. It ran 10.40s over 129 and the car was all steel then, I only had 3800. in the motor and I ported the heads and built the motor myself. After about 150 passes the stock crank broke and took out the short block. I wont use stock cranks anymore. lol I used stock length
valves and used offset keepers and retainers to get a 1.68 to 1.70 installed height. https://youtu.be/X1eowjSwr-o
Could you tell me the cam spec's?
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Old 08-28-17, 10:05PM   #139
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Set on PY 59 cc forgot what # they flow 280 or 300 cfm
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Old 08-28-17, 11:16PM   #140
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How much did you mill off to get it down to 62 cc's?
To tell the truth I don't really know as I had ran those heads since 1992, I have 1000's of passes on them and I could not even count how many valve jobs. I figure some where around .075 /.090 may be more but I've lost track. The only reason I switched to Kre d ports is my steel heads cracked in the # 6 chamber and I was not going to put no more money in them. My heads flowed 248 cfm @ .600. nothing special.
The cam at the time was a Comp solid flat tappet Xtq 280/284 @ .050 just over .600 lift. 108 LSA 1.5 rockers
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Old 08-28-17, 11:29PM   #141
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I think you could only take off 60 before the decks get to thin, and lose clamping for good head gasket seal. I know on the aluminum heads you can take off 60 and still have 1/2" thickness.
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Old 08-28-17, 11:32PM   #142
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MB125 put up a picture of a cut up iron head some were, kind of give you and idea of how thick the deck surface is on a iron head.
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Old 08-28-17, 11:37PM   #143
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This was a #48
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Old 08-29-17, 12:54PM   #144
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One thing I do remember is every .007 we took off the head dropped 1 cc. A racer friend ran a 428 with # 16 steel heads and his chambers were milled down to 59 cc. He had Butler do the port work and he told me his heads flowed 290. His car ran 9.70s on a good day.
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Old 08-29-17, 02:15PM   #145
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One thing I do remember is every .007 we took off the head dropped 1 cc. A racer friend ran a 428 with # 16 steel heads and his chambers were milled down to 59 cc. He had Butler do the port work and he told me his heads flowed 290. His car ran 9.70s on a good day.
Think that's the ones for sale on PY.
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Old 08-29-17, 03:57PM   #146
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One thing I do remember is every .007 we took off the head dropped 1 cc. A racer friend ran a 428 with # 16 steel heads and his chambers were milled down to 59 cc. He had Butler do the port work and he told me his heads flowed 290. His car ran 9.70s on a good day.
That's .090 wow!
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Old 08-29-17, 04:06PM   #147
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The more I think about it , if the deck was a half inch then with the .090 off it would still b like 7/16's thick... Not that bad...
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