Has anyone out there had this problem after a total rebuild? I have a 1967 400 engine it is a complete rebuild same heads, crank, pistons, rods and a complete valve job.. New cam. rings, I assemble it my self.. Starts up but runs terrible.. sound like I have a large vacuum leak around the carb.. can not locate the leak.. This is a California engine complete with all the smog stuff.. What am I missing
Did you change intakes? Check to see if it has the original year intake and heads. There are mating problems when a later model intake is used on early heads.
All original heads and intake, matching numbers made sure of that before the rebuild... any other ideas.. I am at a total loss.. Thanks for the suggestions..
If you think you have a vacuum leak start it make sure you have no open spark and use brake cleaner spray around intake gaskets carb vac lines to see if the idle changes
Who put the timing chain on? Did they align it dot-to-dot ala Chevy or with the CAM at 12:00 ala Pontiac? If you think that might be the case (dot-to-12), use #6 plug wire to time it rather than #1.
1967 has a unique intake manifold and if you have this intake (casting ending with 286), you absolutely need to have the correct combo of gasket and stainless shield between intake and carb. There are two holes where the carb bolts where exhaust comes in to heat the base of the carb. Not having the correct gasket combo will act as a egr stuck open. Frank.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
67 Verdoro Green 400 Front bench w/auto on column Now excepting- free, ready to bolt on, Pontiac Aluminum Heads... Thanks to John(Hammered)-- This project is REBORN!! http://s903.photobucket.com/albums/ac237/lupdiesel/
