CRG Discussion Forum

Camaro Research Group Discussion => General Discussion => Topic started by: montgomg on August 24, 2018, 04:11:37 PM

Title: Camshaft
Post by: montgomg on August 24, 2018, 04:11:37 PM

I have a 69 Z28 with it's original 302. Before my ownership someone stuck a cam a bit different from the original Duntov 30/30 cam. Engine suffers from very low vacuum (5 in Hg) and in spite of advancing the cam 2 degrees and opening the valve lash the vacuum remains low. Good  idle is difficult to achieve and maintain and power brakes are also a bit of a problem.
   For you guys who run the Duntov 30/30 what kind of idle vacuum do you have and do you have your cam installed straight up or advanced? If advance how many degrees?

Title: Re: Camshaft
Post by: jdv69z on August 24, 2018, 08:18:55 PM

8-11 in Hg Std timing

Title: Re: Camshaft
Post by: Fred Mertz on August 25, 2018, 04:02:51 AM

A shaky 7.  Advancing the timing helps a little.