1966 427/390 vacuum advance

[Curt C.]

I seem to be finding conflicting data on what is the correct vacuum advance for my 1966 427/390. Can someone give me a "definitive" answer? Thanks, as always.

[Jerry M.]

Re: 1966 427/390 vacuum advance

I seem to be finding conflicting data on what is the correct vacuum advance for my 1966 427/390. Can someone give me a "definitive" answer? Thanks, as always.

At idle (700 rpm). No vacumn advavance. 4 dgrees advance. Do you also need internal advance info?

If so it is 24 degrees at 2800 rpm.

[Wayne M.]

Re: 1966 427/390 vacuum advance

I seem to be finding conflicting data on what is the correct vacuum advance for my 1966 427/390. Can someone give me a "definitive" answer? Thanks, as always.

Curt -- I don't think there's any doubt that the correct vac adv unit for a '66 L36 (either 1111141 or 142 distrib) is the 1115355 unit, as Joe L. (I think) mentioned.

And the advance specs for this vacuum unit, from Delco Remy test specifications supplement (green) book are: inches Hg to start advance 5 to 7". Inches Hg for max advance 11.2-12.7". Max distributor advance 8 degrees (equals 16 degrees crank advance).

Now the centrifugal advance is a different story, which Jerry may be quoting.

[Jerry M.]

Re: 1966 427/390 vacuum advance

Curt -- I don't think there's any doubt that the correct vac adv unit for a '66 L36 (either 1111141 or 142 distrib) is the 1115355 unit, as Joe L. (I think) mentioned.

And the advance specs for this vacuum unit, from Delco Remy test specifications supplement (green) book are: inches Hg to start advance 5 to 7". Inches Hg for max advance 11.2-12.7". Max distributor advance 8 degrees (equals 16 degrees crank advance).

Now the centrifugal advance is a different story, which Jerry may be
quoting.

Wayne you are correct. I did not read that to ask what can number did he need. I thought he wanted settings.