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Lifter Knock

"Horseplay" said:
It takes the force of the rocker to push the valve open and hold it open against the tension of the valve spring. In order for the valve to "slap" against the valve seat (head) you would have to in some way have the rocker release from the valve tip allowing it to move freely. The only way I see this happening is if you had a serious flat spot in the profile of the cam lobe that let the rocker come loose.
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Ouch! anyway to check with-out tearing it down?
 
Back to the dial indicator set up reading off the pushrod. rotate the crank by hand and watch the readings. You should see the lift numbers increase and decrease smoothly as she rotates. Compare that intake lobe to the neighboring intake lobe and compare.
 
"Horseplay" said:
Back to the dial indicator set up reading off the pushrod. rotate the crank by hand and watch the readings. You should see the lift numbers increase and decrease smoothly as she rotates. Compare that intake lobe to the neighboring intake lobe and compare.
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Okay, that makes sense. I'll get a dial indicator....maybe they include a free 12 pack of beer!
 
As it turns out my wife was having a garage sale this weekend :char and my 73 sitting in our 3rd stall drew all kinds of attention. Yesterday afternoon a gentleman quite adapt at building engines was being dragged through the neighborhood by his wife and saw the hood up and asked me what was happening.....

To make a long story short, he listened and watched the engine and was positive it had a flat spot on the number one cam lobe. He recommended pulling the Cam and having it reground.

Any thoughts on this?
 
First thought is it sucks! Sorry to hear the outcome, Jon. As far as grinding the cam if it were me I wouldn't do it. Aren't you also asking about an 88 302 engine? I'd bite the bullet and go that route. Either way, any engine I would do would have a roller cam. Just too many benefits in comparison and no worries about wiping cam lobes.
 
"Horseplay" said:
First thought is it sucks! Sorry to hear the outcome, Jon. As far as grinding the cam if it were me I wouldn't do it. Aren't you also asking about an 88 302 engine? I'd bite the bullet and go that route. Either way, any engine I would do would have a roller cam. Just too many benefits in comparison and no worries about wiping cam lobes.
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Thanks Terry,

I went ahead and bought the 88 this morning and I'm excited to do the transplant. I need to get a new Flex Plate, not sure if it needs to be 157 teeth or 164, and I'll put a new oil pan it as well. I'm trying now to determine if I should sell my old 302 as is or get the cam fixed, because many of the other parts will becoming off the old to put on the new, I'm leaning towards as is........
 
IMO, sell it as-is. A new owner will more than likely want to re-build it himself.
 
+1 on sell as is. You most likely will never get your money out of an engine you rebuild. No warranty on parts, questionable work because they do not know who did the rebuild, not "just what they want" but close......and on and on. Plus, they will come back to you if there is the slightest problem.
 
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