The few times I tried having the secondary slots exposed at idle there was an off idle hesitation that couldn’t be tuned out.
Do like everyone on here suggests and square the primary and set idle speed with the secondary plates. A small turn on the secondary screw makes a big difference in idle speed. Usually 1/8 to 1/4 turn at most from closed will do it.
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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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