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#1 |
Registered User
![]() Join Date: Apr 2014
Location: Thousand Oaks, CA
Posts: 118
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Lifter and valve noises..? Low profile covers an issue?
Hi all,
I recently bought a 1970 original 402 bb in my CST/10. I have done a full tune up, and valve adjustment. Valve train seems to be fine. I am still hearing a light "ticking" noise coming from my motor - as I did when I bought it. Knowing it was an older motor, I put high millage oil as well as Lucas additive. I thought that would quite it down, but no luck. I have ruled out exhaust leak for the most part (Headman headers, common issue, I know...) as it really seems to be a metallic sound. I have heard that on some of the late 60s big blocks, that the low-profile (mine) valve covers sometimes were a problem. Can anyone confirm this? Do the rockers sometimes hit the cover, and make noise? I attached a pic of truck and motor. Thanks for your input! Chevy Brian |
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#2 |
Senior Moment
![]() Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,138
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Re: Lifter and valve noises..? Low profile covers an issue?
I bought a 1970 454 from a Chevelle Wagon for my truck. When I got it, it had 4 DEAD lobes on the camshaft. After 3 cam changes using COMP Lunati and Isky, all Hydraulic Cams, it still sounded like it had solid lifters. I even had the lifter bores redone ($$$$$$) and bought $400 worth of Roller Rockers - Still the ticking. SO I put a Lunati Solid lifter Cam in it so they can all make a little noise. It actually sounds quitter with the solids than it did with a Hydraulic COMP. Go figure. I’ve since been told that some Big Blocks make noise – Ya no kidding- So I’ve learned to not worry about it and Drive it like I Stole it. Way more fun
Yes the low profile valve covers can resonate the noise. I have tall Aluminum covers Sorry for the Rant Good Luck
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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#3 |
Registered User
![]() Join Date: Apr 2014
Location: Thousand Oaks, CA
Posts: 118
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Re: Lifter and valve noises..? Low profile covers an issue?
Yes, Aluminum TALLER covers would be a good idea, thanks!
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#4 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Lifter and valve noises..? Low profile covers an issue?
I had to use spacers on a motor that had roller rockers. I'll stick a photo below. As you can see I was trying not to draw attention to them.
But for stock rockers, unless the baffles or drippers or something are bent, it should be fine. You might want to get a mechanics stethoscope, or even a piece of PVC pipe and listen and see if you can narrow down the location. Also feel along the valve cover; if you feel any tapping, there's something interfering. However, when you see hoof prints, think horses, not zebras. Maybe there's something simpler, like a dirty lifter or loose rocker? All my big blocks are quiet, or at least quieter than everything else going on when they're running!
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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hydraulic, lifter, stuck, tick engine |
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