How to determine if this camshaft is hydraulic or solid lifter? - Team Camaro Tech
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post #1 of 4 (permalink) Old Jun 22nd, 15, 06:59 PM Thread Starter
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Tim
 
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Post How to determine if this camshaft is hydraulic or solid lifter?

I bought a 79 Z28 from a storage yard. The owner had died. No info on the car, motor, etc. I bought it because it had a super T-10 and a 64 corvette 327 in it that looked pretty new with no apparent use visible.

I am getting to pull the drive train but decided to start the engine first. The engine seemed to have loose rockers and the valve covers were not bolted down. I pulled number 1 spark plug, got the compression pushing out the hole, lined up the timing mark and I adjusted the rockers 1/2 turn past zero lash (360 later adjusted the others). I had my daughter turn the engine over to watch the rockers and noticed and after adjusting it had no compression at the number 1 cylinder and turned over very fast like it had no compression at all!

What do you guys think? Solid lift cam?

Ratchetmaster
1968 SS Merlin III PBM Performance Products 572 with all the good stuff, Dart PRO 1 aluminum heads, Jesel roller rockers, Steel 4340 scat crankshaft, PBM rods, SRP forged pistons, Billet specialties, Be Cool radiator package , Tremec TKO 600 5 speed, Moser 12 bolt, Hotchskis, Baer, etc.
1968 RS SS 350 M4
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post #2 of 4 (permalink) Old Jun 22nd, 15, 07:07 PM
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Brian
 
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Re: How to determine if this camshaft is hydrollic or solid lifter?

If it is stock factory Corvette 327 for 64:
Base 327 was 250hp, RPO L75 was 300hp and both were hydraulic.
RPO L76 and L84 were both "mechanical" and rated 365 and 375hp respectively
http://www.vettefacts.com/c2/1964.aspx


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post #3 of 4 (permalink) Old Jun 22nd, 15, 07:48 PM
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Mark
 
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Re: How to determine if this camshaft is hydrollic or solid lifter?

If it's a solid lifter cam then after shut down the valves will not move so if the rocker arm is down then it'll be down still the next day. If it's hydraulic then the lifters will bleed down and a rocker arm that was all the way down after a drive, it'll be up 1/2 or more by the next day or a few hrs. You can push down on a push rod that has a hydraulic cam after the lifters bleed off. A solid won't budge.

Mark 70 Z28 M22 3.73 Z21 Z87 - Lunati 20120121 Roller Cam

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post #4 of 4 (permalink) Old Jun 23rd, 15, 03:03 PM Thread Starter
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Tim
 
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Re: How to determine if this camshaft is hydrollic or solid lifter?

Thanks for the replies. The engine is no longer built to factory specs. Also, I am preparing to start the engine and thought I would adjust the valve prior to starting it. I will try to push down the push rod and see if it goes down. I believe it is a solid lift cam so I will adjust the cam to .030 on intake and exhaust to be safe and get it running and see what it does. Since it lost compression after adjusting the valves I am going to go with the thought that it is a solid lifter cam.

Ratchetmaster
1968 SS Merlin III PBM Performance Products 572 with all the good stuff, Dart PRO 1 aluminum heads, Jesel roller rockers, Steel 4340 scat crankshaft, PBM rods, SRP forged pistons, Billet specialties, Be Cool radiator package , Tremec TKO 600 5 speed, Moser 12 bolt, Hotchskis, Baer, etc.
1968 RS SS 350 M4
1969 Olds 442 convertible
1972 454 ElCamino Turbo 400 (X now owns it! )
1973 RS LT Z28 M4 SOLD
2006 Silverado Duramax lbz Crew Cab SB 4x4
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