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al's71gmc · 08-31-2005, 08:16 AM

I asked on the engine board but didn't get much response. So I hope I'm not breaking the rules about double posting. I only have 1 night left before I go on 7 off, and want to figure this out before then. I don't have internet service at home.

We got my son's 72 running after sitting for over a year. Put new timing set and rebuilt the carb. It runs very strong, but has a lot of lifter noise/knocking. It has only been run a few k miles in the last 10 years or so. Has 75k original miles. We had planned on replacing the engine, but now I'm not sure. We checked compression and has 125-132 in all 8, and doesn't smoke at all. It's a 350/4spd with everything stock. We found a note from a mech. that worked on it years ago that said it had bad lifters or cam or both. We're going to adjust the valves to try and quiet it down, but I don't expect that to work, or the mech would have done it. I'm wanting advice on replacing cam and lifters and maybe getting the heads done in an engine with 75k miles. $$ tight, but i don't want to spend less and have to RR the motor in 6 mnths anyway. if we decide to do the cam and lifters, what would you all suggest for cam. As always, any advice is greatly appreciated.
Al

08-31-2005, 08:16 AM	#1
al's71gmc 4 eyed fever Join Date: Jul 2005 Location: Eureka, Nevada Posts: 500	lifter noise I asked on the engine board but didn't get much response. So I hope I'm not breaking the rules about double posting. I only have 1 night left before I go on 7 off, and want to figure this out before then. I don't have internet service at home. We got my son's 72 running after sitting for over a year. Put new timing set and rebuilt the carb. It runs very strong, but has a lot of lifter noise/knocking. It has only been run a few k miles in the last 10 years or so. Has 75k original miles. We had planned on replacing the engine, but now I'm not sure. We checked compression and has 125-132 in all 8, and doesn't smoke at all. It's a 350/4spd with everything stock. We found a note from a mech. that worked on it years ago that said it had bad lifters or cam or both. We're going to adjust the valves to try and quiet it down, but I don't expect that to work, or the mech would have done it. I'm wanting advice on replacing cam and lifters and maybe getting the heads done in an engine with 75k miles. $$ tight, but i don't want to spend less and have to RR the motor in 6 mnths anyway. if we decide to do the cam and lifters, what would you all suggest for cam. As always, any advice is greatly appreciated. Al __________________ 1971 GMC 2500 4x4 1972 GMC Sierra Grande 1/2 t 4x4-#1 son's truck. Recently completed resto. 4 YO daughter," Daddy, I like your truck better than Mom's." (2000 F350-ranch truck) Smart kid!!