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Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
I put together a 350 for my car a few months ago. Wound up getting it into the car, engine runs strong. On driving it I noticed a noise seemingly coming from the valve train. From the get-go I was skeptical that the way these rockers moved around on the valve tip was right, but I didn't really know better. Now that I'm hearing the noise and really seeing how these are moving the valves, there's no way this can be right. Input is appreciated. Heads are AFR 180cc, 3/8 screw in studs with AFR supplied guideplates. Pushrods are Comp 5/16 7.2" length. Rockers are Comp 17002-16 3/8 mount. Rockers were set 3/4 turn past 0 lash.
With the pushrod up against the guideplate on one side I have .012" clearance on the other side. The movement is not nearly as extreme on the pushrod side. The rockers seem to move around on the shaft itself.
Last edited by NowhereFast; 06-13-2020 at 09:10 PM.
I had the same rockers on a 305 the ticking drove me nuts! I put stock ones back on and noise went away. They have alot of sideplay I was expecting better quality with comp. Years ago I had cheap proforms and had zero noise from them.
I have a set of those and wasn't impressed with the appearance or finish work on them. Didn't use them. Went with Scorpion and am very happy with them.
With the pushrod up against the guideplate on one side I have .12" clearance on the other side. The movement is not nearly as extreme on the pushrod side. The rockers seem to move around on the shaft itself.
That's nearly an eigth of an inch (0.125). That can't be right. It might be a good idea to contact the supplier to inquire about their tolerances.
06-10-2020, 07:55 PM
