Timing problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**ScottH** · 11-03-2003, 10:57 PM

Recently picked up a 72 w/402 in it. I have a problem where it doesn't want to crank when hot. A few board members suggested checking the timing. What I found is it has to be really advanced to run without back firing through the carb. The timing mark is basically straight up instead of on the timing mark where it should be.

The PO said he installed a cam and lifters, but didn't leave me a card so I have no idea of lift/duration. I believe he mentioned it was a RV performance range.

Does anyone have any suggestions on properly timing the engine? Could the PO have installed the distributor off a bit?

Any info, suggestions, ideas are appreciated.

Thanks!

11-03-2003, 10:57 PM	#1
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,190	Timing problem Recently picked up a 72 w/402 in it. I have a problem where it doesn't want to crank when hot. A few board members suggested checking the timing. What I found is it has to be really advanced to run without back firing through the carb. The timing mark is basically straight up instead of on the timing mark where it should be. The PO said he installed a cam and lifters, but didn't leave me a card so I have no idea of lift/duration. I believe he mentioned it was a RV performance range. Does anyone have any suggestions on properly timing the engine? Could the PO have installed the distributor off a bit? Any info, suggestions, ideas are appreciated. Thanks!



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