CLASS RACER FORUM - View Single Post

Rsmith38 · 12-28-2013, 09:24 AM

On my 78 C20 I started at 8 MPG but was able to get it up to 13+ (on highway) Advance weights were frozen, used light springs; but the greatest improvement was the adj vac advance. I beleive I ended up at 41 degrees - just kept increasing it until it pinged.

12-28-2013, 09:24 AM	#9
Rsmith38 Member Join Date: Mar 2011 Posts: 186 Likes: 0 Liked 28 Times in 15 Posts	Re: 350 Head Gasket On my 78 C20 I started at 8 MPG but was able to get it up to 13+ (on highway) Advance weights were frozen, used light springs; but the greatest improvement was the adj vac advance. I beleive I ended up at 41 degrees - just kept increasing it until it pinged.