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Reply to "After market 351 Cleveland Blocks"

The Ford boss block that I purchased was the big bore version.  If I remember correctly it can be bored to achieve 440 ci.  My block is 427 ci.  I spoke to an engineer at ford about the block.  He stated that they had put 1500 hp through it without any problems.  I have the chi 225 3v heads on it with the standard exhaust ports.  I have the low rise single plane on it.  They offer 3 versions of the single plane intake.  I initially had their dual plane on it but didn’t find the performance as good as chi claimed.  Picked up 99 hp by switching to their low rise single plane.  On my motor this intake outperformed the dual plane through out the entire dyno range (2500-7000).

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