The Ford Barn - View Single Post

frank55a · 10-10-2020, 12:52 PM

One thing that nobody mentioned is check your intake and exhaust valve (lifter) clearances. This is a pretty simple job, depending on what source you read they may vary one way or the other .001 to .002 inch. For example:
1. Les Andrews Exhaust .015" and Intake .013"
2. "The Model A Engine" by McRee Exhaust .012" - .013" and Intake .010 - .012"
3. Per the Ford Service Bulletin page 338 "To ensure a uniform power stroke in each cylinder, it is absolutely necessary that the correct clearance (.010" to .013") be maintained between valves and push rods, ….."

If your valve clearances are not consistent and similar to any of the above the power of the engine will be affected.

10-10-2020, 12:52 PM	#16
frank55a Senior Member Join Date: Jun 2010 Posts: 934	Re: Model A only runs 40 miles One thing that nobody mentioned is check your intake and exhaust valve (lifter) clearances. This is a pretty simple job, depending on what source you read they may vary one way or the other .001 to .002 inch. For example: 1. Les Andrews Exhaust .015" and Intake .013" 2. "The Model A Engine" by McRee Exhaust .012" - .013" and Intake .010 - .012" 3. Per the Ford Service Bulletin page 338 "To ensure a uniform power stroke in each cylinder, it is absolutely necessary that the correct clearance (.010" to .013") be maintained between valves and push rods, ….." If your valve clearances are not consistent and similar to any of the above the power of the engine will be affected.