Broken rocker studs!!!
Thread Starter
Racer
Joined: Jun 2006
Posts: 477
Likes: 1
From: Jefferson Georgia
Broken rocker studs!!!
I've broken 2, count them 2, exhaust rocker studs since Ive had the 383 running. 
Stock length pushrods, 1.6 rr, 512 lift with the 1.6s. 383 with ported 113s, lt4 springs. Looks like the rockers are riding right on the center of the valve from the looks of the wear. Original roller lifters.
Any ideas??
Stock length pushrods, 1.6 rr, 512 lift with the 1.6s. 383 with ported 113s, lt4 springs. Looks like the rockers are riding right on the center of the valve from the looks of the wear. Original roller lifters.Any ideas??
Last edited by formerfoxbody; Jun 8, 2009 at 05:35 PM. Reason: add
Thread Starter
Racer
Joined: Jun 2006
Posts: 477
Likes: 1
From: Jefferson Georgia
Found it! the umbrella seals on the exhaust valves. Without the springs in place the measurement between the bottom of the spring retainer to the top of the seal as it sat completely seated was .488. Lift with the 1.6rrs and the cam I run is .512.
Sure wish the guys that rebuilt my heads would have caught that. That is one of the reasons that I gave then the cam specs and told them I would be running 1.6rrs.
The new valves have no provisions for the o-ring seals. So, the question would be what type exhaust seal could I use or should I go back with 1.5rrs for the exhaust that would leave me .008 clearance.
Sure wish the guys that rebuilt my heads would have caught that. That is one of the reasons that I gave then the cam specs and told them I would be running 1.6rrs.
The new valves have no provisions for the o-ring seals. So, the question would be what type exhaust seal could I use or should I go back with 1.5rrs for the exhaust that would leave me .008 clearance.
Thread Starter
Racer
Joined: Jun 2006
Posts: 477
Likes: 1
From: Jefferson Georgia
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Melting Slicks
Joined: Dec 2008
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From: Mystic CT
Found it! the umbrella seals on the exhaust valves. Without the springs in place the measurement between the bottom of the spring retainer to the top of the seal as it sat completely seated was .488. Lift with the 1.6rrs and the cam I run is .512.
Sure wish the guys that rebuilt my heads would have caught that. That is one of the reasons that I gave then the cam specs and told them I would be running 1.6rrs.
The new valves have no provisions for the o-ring seals. So, the question would be what type exhaust seal could I use or should I go back with 1.5rrs for the exhaust that would leave me .008 clearance.
Sure wish the guys that rebuilt my heads would have caught that. That is one of the reasons that I gave then the cam specs and told them I would be running 1.6rrs.
The new valves have no provisions for the o-ring seals. So, the question would be what type exhaust seal could I use or should I go back with 1.5rrs for the exhaust that would leave me .008 clearance.
