Sick Engine

[Mike V. Florida]

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Originally Posted by Rainmaker Ron

You have a massive vacuum leak, probably at the intake to block gasket. This will require truing the manifolds and intalling a new gasket. The symptoms are classic, starts good and idles fine. Will not rev up or make power. GAV must be opened to compensate for unwanted air. Could also be caused by a warped flange on the tillotson carb or a cracked intake manifold. An intake valve stuck open will cause similar problems but usually be hard starting also.
Rainmaker Ron

Ron,

In this case would someone try to use a propane torch (not lit) and wave it around the area where the leak is suspected to see it engine increases speed?