recommended camshafts

tacobo670 · Jan 19, 2015

SloPoke said: ↑

Yes, that would be a correct statement BUT.....85 and later 22r/re heads (with pear shaped exhaust ports) will not work on the early blocks without swapping pistons.
The early blocks are roughly a 1/4" taller (.19") than the later blocks and the pistons stick up more above the top ring than they do on later blocks. This raised portion of the early pistons will contact the 85 & later heads when used on early blocks.
The early blocks used a 98 link timing chain due to the taller deck heigth where as the 85 and later blocks use a 96 link timing chain due to the shorter deck heigth. This poses another issue when trying to use later heads on early blocks.
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understood.

eighty_D said: ↑

From my research 20R heads have a slightly smaller cc volume (80cc vs 82cc) and the slight reduction in chamber bore size 89<92mn adds a little more squish as well.
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the early "hemi" heads have larger cc volume (80-82) than the late "pear" shaped head. (52-54)

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recommended camshafts

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