I tend to agree with dataway on the machining issue. It’s amazing how many errors there are these days compared to the past when the CNC’s of today make the machines and tooling of the past look Stone Age.
When the OEM’s moved to roller valve trains it seemed to really hit the QC of the flat tappers hard. That and the fact there are a lot more machine operators than true machinists in the trades these days.
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68 GTO,3860#
Stock Original 400/M-20 Muncie,3.55’s
13.86 @ 100
Old combo:
462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's.
1968 Pontiac GTO : 11.114 @ 120.130 MPH
New combo:
517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's
636HP/654TQ
1.452 10.603 @ 125.09
http://www.dragtimes.com/Pontiac-GTO...lip-31594.html
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