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#1
01-19-2009, 08:30 PM
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Noisy Valvetrain
I have a noisy tap on number 8 cylinder rockers that I can't get to quite down, so I'm looking for any suggestions you guys might have. I have a 428 with KRE "D" heads and a Comp Hyd. Roller cam. I've adjusted the valves several times using several methods. I also changed the hyd. roller lifters, push rods, and roller rockers ( Crower ), and I still have tapping on the number 8 cylinder valves only. All other valves are quite. Any ideas?
Thanks. Bob
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#2
01-20-2009, 01:08 AM
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Sounds like the oil galley plug was left out of the rear of the passenger side oil galley. This plug is inside the block about 2" in from the 15/16" access freeze plug in the rear of the block. I drill a .040" hole in the galley plug I install in the rear of that oil galley. It gives positive lubrication for the distributor gear.
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Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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#3
01-20-2009, 09:02 AM
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Did you happen to check the valve guides on that particular cylinder when you changed out the parts?.....Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#4
01-20-2009, 12:12 PM
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Thanks for responding guys.
Paul-drilled gally plug was installed and eng has great oil pressure. Cliff- no I didn't check the heads personally, but I did have them gone over. I'll have to check with the shop and see if the guides were checked. One thing I forgot to mention; the tapping is llouder after the eng warms up. I feel it has to be something with the head, as everything else has been changed. I guess I'll have to pull the head and have it gone over. BTW, I received the 10" continental torque converter I ordered from you last week...thanks for the fast service.
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#5
01-20-2009, 08:53 PM
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Could it be a pushrod? Sometimes you get a tapping noise when the pushrod holes have not been clearanced for high ratio (1.6, 1.65) rockers...
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#6
01-21-2009, 01:33 PM
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69Goat1, thanks for the response. The KRE heads come clearanced for 1.65 rockers, but I checked them anyway and found the clearance to be good. I'm thinking it has to be something with the valve spring. Thanks. Bob
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#7
01-21-2009, 04:24 PM
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I wasn't thinking about it being aluminum head. They will grow quite a bit and loosen up your valve lash accordingly. How much are you lashing them? 3/4-1 turn? Or only 1/4-1/2 turn?
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Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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#8
01-21-2009, 11:26 PM
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Paul, lashing them at 3/4 turn. I guess I'm just going to have to put up with the tapping, it's not that loud, just annoying.
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