ok finishing my 500hp, +.030, factory cam, intake, but has stainless marine full headers, doing up a 800 DP, just cause I have one, milling the airhorn, where's a good place to start jetting wise on this setup...Thanks Rob...also how much total timing to run on 87 at times..

ttt

77p - 92s with a 4.5pv in the primary. This assumes air bleeds are fixed and original. You could also get the hp500 specs and do the staggered jetting.

34 degrees timing all in.

Holley 800cfm HP500 stock jetting is:

Primary - Port 81, Stbd 75
Secondary - Port 89, Stbd 93

6.5 PV in the front. The secondaries don't have a PV.

If I was rejetting, I would probably just use 77 primary jets and 91 secondary jets.

thanks guys, just what I needed...and just getting ready to put carb together !! Rob

http://www.mercruiserparts.com/Show_...OR+AND+LINKAGE here mec setup