Shrinking Gap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Smittie · 10-06-2014, 01:03 PM

OK motorheads. Riddle me this.

The book says the initial gap should be set to .019, proper dwell angle is 31 to 34. Setting the points to .019 yields a dwell angle of about 20, at a dwell of 32 the points are gapped at < .080. My question is what is wearing out that causes the gap to shrink? In all other respects the engine runs smooth and steady.

The engine is a 1976 GM 250 CID inline 6 cylinder with a single barrel Rochester B manual choke carb which now lives in a 1963 Chevy C10.

10-06-2014, 01:03 PM	#1
Smittie Registered User Join Date: Aug 2014 Location: Coolsville, CA Posts: 15	Shrinking Gap OK motorheads. Riddle me this. The book says the initial gap should be set to .019, proper dwell angle is 31 to 34. Setting the points to .019 yields a dwell angle of about 20, at a dwell of 32 the points are gapped at < .080. My question is what is wearing out that causes the gap to shrink? In all other respects the engine runs smooth and steady. The engine is a 1976 GM 250 CID inline 6 cylinder with a single barrel Rochester B manual choke carb which now lives in a 1963 Chevy C10.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.