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Kwiksilver · 05-01-2011, 10:53 PM

I don't really understand that. Isn't all the timing in by then anyway? I have been sold on using manifold vacuum and when the vac drops the timing would retard for pulling out of a bog. Does ported vacuum drop at high rpm's?

05-01-2011, 10:53 PM	#8
Kwiksilver Senior Member Join Date: Mar 2011 Posts: 475	I don't really understand that. Isn't all the timing in by then anyway? I have been sold on using manifold vacuum and when the vac drops the timing would retard for pulling out of a bog. Does ported vacuum drop at high rpm's? __________________ 66 ford f100 shoptruck. 351 cleveland 4v, CJ heads, holley 750, toploader 4spd, rust.