Quote:
Originally Posted by "QUICK-SILVER"
Engine turned backwards just a hair when you let off the starter.
If rocker movement is good on both sides...we can rule out backfire from trapped exhaust. Like you get when an exhaust lobe is wiped out.
How is the engine running , in general, at idle speed? If it's rough...You could have a vacuum leak. Enough leak could cause a lean backfire and not be the carb causing it. Repeated reving and letting off will get fuel mix in the intake all messed up. Some runners end up pig rich and others near dry. That could have caused the first backfire and blown a gasket out or vacuum hose or cap off.
That carb mounted with two gaskets and the thin adapter plate?
E-carbs on Performer intakes are famous/notorious for vacuum leaks without the plate. Not enough contact area for the square bore carb flange at the spread bore on the intake.
Still thinking about the click/whack moving around.
Clay
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The engine ran smooth. Perfect idle. Break in ran smooth. Sounded perfect. Lunati has you go to 3500 for a full minute towards the end of the break in and it sounded good at 3500. Everyone listening thought it sounded great at 2000 rpm and up. At the end of the break in period I backed off the idle screw down to 1000 rpm and that's when I heard the sounds that weren't normal. I let it cool off and thought about it. Called Lunati.
Changed the oil again. Started it up. Heard the sound. Reved it and then got the 'pop' out the carb. Moved the timing around, no change. Even hooked up a different fuel source. No change.