Ported Vacuum ?

[78guy]

Has anyone used ported vacuum for the vac. advance ? Any advantage or disadvantage ? Didn't some come that way from the factory ?

 

[Crimson Thunder]

Do a search on that topic here on the forum. John Z did an excellent write up on Manifold vs ported vacuum. I'll post a link if I can find it.

 

[bill81vette]

Welcome to CAC!!!
enjoy!!

 

[Vettehead Mikey]

There's no advantage to ported vacuum at all- it was used for emissions purposes only to retard the timing at idle..