Nelson Posted January 22 Report Share Posted January 22 (edited) I’ve always wondered the significance of the A and B designation for the R3 and R4 engines. I’ve been thinking about this for years . I’ve asked the Granatellis with no luck at all. It dawned on me that the A engines were probably built in 1962 and probably were basically 299 engines with reworked standard cylinder heads. The B engines I originally thought were 304 with R3/4 cylinder heads until i found some B engines with 299 ci with the late cylinder heads. Then I remember the six cylinder Bonneville engines were also given B numbers. So my deduction would be all engines built in 1962 were simply A engines and are very few in number. All 1963 engines were B engines and so happened to have the new cylinder heads on the V8 and the six was assigned a B number because of the year. Paxton’s paperwork for expenditures were A for 1962 and B for 1963. This sounds reasonable to me. What do you think? Edited January 22 by Nelson Link to comment Share on other sites More sharing options...
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