CRG Discussion Forum
Camaro Research Group Discussion => Maintenance => Topic started by: Z10Mike on October 12, 2015, 06:51:12 PM
-
I found my used 346 cam in the top of the garage the other day and it looks new. Problem is I can't find the lifters. Is this cam just fit for the recycle bin or can it be run with new lifters? I heard that lifters with the oil holes on the face will allow use of used cams. Any thoughts on this?
-
My understanding:
New Cam- new lifters=ok
used cam-matched used lifters(kept in order)=ok
used cam-new lifters=ok.....what you have or will have.
new cam-used lifters=not ok
We did this long before holes were EDM'd in the bottom of the lifter.
Some of my buddies did some real yay-hoo stuff, like using used lifters from several engines on a used cam from even another engine.
I even put a cam I got out of an engine I bought BITD and put it in the 307 in my P-Up with a set of used lifters I had. Worked!
Heavy spring press. will do in a cam pre-maturely, Use factory or recommended springs.
-
Bentley's 'understanding' is the same as the common 'wisdom' that I've grown up with as well...
-
Amen - did the used cam/new lifters in the past. Use new cam/new lifters break in protocol with the proper cam lube, zinc/phosphorus based oils. proper spring rate. Should not be a problem -
Regards -
-
New lifters it is with the original cam. Thanks to all for the feedback.
-
Probably wont work. Put a white stripe on the top of the push rods and note if they are spinning at start up. If not neither are the corresponding lifters.
-
I wouldn't risk a teardown on a mix of used and new parts, especially when you can buy a perfect blueprint duplicate of that cam from Federal-Mogul/Speed-Pro for a little over a hundred bucks. But that's just me. :)
-
Glad I checked back in to read the feedback. Guess I can put in on a shelf for display in the man cave along with my orphan RA-V Pontiac carb.
-
Or, stick it on eBay and pay for the replacement camshaft - there are quite a few potential buyers out there that would rather have a genuine original camshaft in play than a potential offshore reproduction. If you can guarantee it's made in the US, I would feel better about it.
Remember, GM service manuals used to promote servicing used lifters, actually a regrinding of the lifter face, which would be very similar to using a new lifter as you would have to break them in just as if replacing with new.
If you're afraid of it, use a new one. I've got two used ones - one is going in the X77 when it takes it's turn.
Just my opinion - for what it's worth.
-
Actually, I left out a step - see the following page from the Chassis Overhaul Manual ('70) for mechanical lifter service and replacement - recommendation is to lap the bottom of the new lifter with 600 grit emery cloth to even out the grinding marks before installing on a used camshaft. Break in recommendations remained.
By this date (and probably a lot earlier), the measurement of wear and refinishing statement had been replaced by the notation to replace. Disassembly of mechanical was discouraged, but the disassembly/inspection of hydraulics was still in the book.
Regards,
Steve
-
Or, stick it on eBay and pay for the replacement camshaft - there are quite a few potential buyers out there that would rather have a genuine original camshaft in play than a potential offshore reproduction. If you can guarantee it's made in the US, I would feel better about it.
Remember, GM service manuals used to promote servicing used lifters, actually a regrinding of the lifter face, which would be very similar to using a new lifter as you would have to break them in just as if replacing with new.
If you're afraid of it, use a new one. I've got two used ones - one is going in the X77 when it takes it's turn.
Just my opinion - for what it's worth.
I'm in agreement, Steve.. :)