Quote:
Originally Posted by Flathead Fever
I would give it a different supply of fuel and test it. Very carefully put a 5-gallon can of gas inside the car on the floorboard and bypass the fuel system. Disconnect the fuel line from the tank at the firewall and plug it. Have somebody go with you to keep an eye on the gas can. The tank or line might be plugged just enough to let it run up to 45 mph and then it starts acting liking a governor and limiting your fuel. By the time you stop and look at it the carb is filled back up which makes it hard to diagnose. If you suspect the fuel pump you can by-pass it with a 1 1/2-pound electric fuel pump. Check the fuel pump rod length and travel. Maybe the cam lobe that drives it has gone partially flat.
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Hi Flathead Fever.
Many thanks for your suggestion.
We did this test (not on the road though) and problem still there. Fuel pump doing OK (±1 pint delivered after 30 sec @ 700 rpm).
We are now looking at intake manifold. It's now clean and we have all new gaskets. Before we put it back in we decided to check valve lash. Waiting for delivery of lifter wrench.
Could someone confirm that these are acceptable values:
Intake: 0.10-0.12
Exhaust: 0.14-0.16
Do we check like go 0.10 no go 0.12 ?