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Bbc 454 build.

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Old 04-09-2019, 12:07 AM
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Originally Posted by JaniH
We have RON 95 E10 (10% ethanol) and RON 98 E5 (5% ethanol). Usually all marinas have Ron 98 E5
98 RON is about equal to 93-94 in the US, so I'd stick with 9.5-1 or so CR. I have seen higher run on that gas, but I like to make errors on the caution side.
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Old 04-09-2019, 12:44 AM
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If i am undersrtood right, the dynamic compression ratio should be arround 8.0 or bit more.
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Old 04-09-2019, 07:50 AM
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you can go 10/10.5-1 compression.I ran 10.3-1 for years on iron heads and 93 octane.
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Old 04-09-2019, 01:57 PM
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Originally Posted by JaniH
If i am undersrtood right, the dynamic compression ratio should be arround 8.0 or bit more.
In very general terms, yes. Big difference between Dynamic and static CR.
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Old 04-09-2019, 03:06 PM
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Just bought Summit brand 308cc rec-port heads. Used under 20 hours. could be same as Dart iron eagle 308cc


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Old 04-09-2019, 05:24 PM
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summit brand cast iron BBC is from Dart,

the 308's need 4 different cam lobes.
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Old 04-09-2019, 07:29 PM
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Originally Posted by JaniH
Just bought Summit brand 308cc rec-port heads. Used under 20 hours. could be same as Dart iron eagle 308cc


very good choice,one million times better than the peanut port gm head.
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Old 04-09-2019, 08:31 PM
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Originally Posted by JaniH
Just bought Summit brand 308cc rec-port heads. Used under 20 hours. could be same as Dart iron eagle 308cc
You just made your goal a million times easier to reach.
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Old 04-10-2019, 05:40 AM
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This intake came with the heads. Cant find any casting numbers.
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Old 04-10-2019, 07:23 AM
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Not sure if it's ok to post this
but if any problems with your big block?I have 2 new 454 HO rectangular port one with new intake & stainless marine exaust!Sorry for the hi jack!
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