I was told the newer ones...out of the trucks and such, atleast the ones that were machined to accept roller cams, were lightend up in certain areas, which made them weaker the the older ones. I have yet to build my 351w..so I do not know this for a fact...just been told.
Ryan
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65 Fastback 91 roller 306, H/C/I
AOD-Bauman, PI Stallion, 4.10's and traction loc
04 Grand Cherokee Freedom Edition
79 Ford F-250 4x4 - Restored
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