1970 Dodge Dart 318 upgrades

toolmanmike said

Does anyone really know how big the chambers are on 302's compared to other 318 heads? I know different years are different. All my engine books list 302's @ 56-65cc where as standard 318 heads are 60-69cc depending on what year.

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I really dunno where 60 would come from for a factory (earlier) 318 chamber, like a 675 head... 68 would be a good nominal to use. The 60 may just the NHRA minimum.... not what one would find from the factory. I'd use 62-63 for the 302's but it would be nice to hear your actual numbers.