427 TIMING SPECS

[Howard K.]

Can anyone help me with the timing specs and rpm settings with my 67 427-400hp 4SP with ac and smog. Thanks in advance.

[Joe L.]

Re: 427 TIMING SPECS

glen-----

Initial timing= 4 degrees BTDC

Idle speed= 750 RPM (with A/C "on")

[Howard K.]

BACK TO JOE

Is there no difference with smog pump. And what would it be with ac off

[John H.]

Re: BACK TO JOE

Glen -

Joe gave you the setting for smog (non-A.I.R. 400's were set at 550 rpm). There is no printed spec for idle setting with the A/C off - set it where you like it and it doesn't get rough when you turn the A/C on.