Help Justin !!!
Thread Starter
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Help Justin !!!
QUESTION---Hey guys in a stock motor if you break a timing chain the pistons usually clears all the valves.In Justins motor with his cam would this be the case or is the clearance critical enough to tweak some valves.I am not familiar with his setup.I hate to beat a dead horse but I think a cyl. leakage test could be useful.
Drifting
Joined: Aug 2005
Posts: 1,289
Likes: 3
From: East Waterboro Maine
Who's Justin? Not everyone may know him by his first name, not to mention his engine specs. You may get a better response if you call him by his screen name provide more info on his engine specs.
Drifting
Joined: Aug 2005
Posts: 1,289
Likes: 3
From: East Waterboro Maine
I believe that even in the stock setup the pistons would make contact with the valves if the timing chain broke while the engine was running. The cam would stop rotating pretty quick whereas the crank would take longer to stop, especially if the car was running in gear. Provided the crank makes one full revolution while the cam is stationary gaurantees valve contact somewhere.
Last edited by Maine Vette; Jun 8, 2006 at 09:35 PM.
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Drifting
Joined: Aug 2005
Posts: 1,289
Likes: 3
From: East Waterboro Maine
I just ran out to the garage and looked at my stock '71 LS-5 heads. The low side of the exhaust valve is only about 1/8" above the deck height. Based on that it wouldn't take much valve movement to cause a problem.
Drifting
Joined: Aug 2005
Posts: 1,289
Likes: 3
From: East Waterboro Maine
Originally Posted by dwncchs
I was thinking he might have less piston to valve clearance than a stock cam and I dont know what pistons are in his engine.He has a Holley systamax whatever that is.