I just put the heads back on a 66 289. The engine is pre-rail rockers. I had the guide holes in the heads drilled out, milled the rocker bosses and installed screw in rocker studs with guide plates. The push rods are standard length (6.800") Comp Cams hardened push rods (Part # 7632-16). I replaced the stock stamped rockers with comp cams roller tip rockers (Part # 1442-16).
I marked the valve tips with a dry erase marker on the intake and exhaust valves on cylinder 1 and set the lash. I rotated the engine and removed the rockers to check the rocker contact area on the valve tip and have a few questions.
1) The marks on the valve tips are a bit towards the exhaust side of the heads. The rocker travel on the valve tip is .075". After a ton of reading, it seems less rocker travel on valve tip is more important than the contact point being centered on the valve. Does my setup look okay or should I try to dial it in better?
2) The rockers seem to sit very close to the base of the screw in studs. I'm use to how the stock rockers sit on the previous press in studs which has a lot more space between the base of the rocker and rocker stud boss. I can turn the rocker adjustment screw about another half turn before it bottoms out on my current setup. Does this seem okay?
Below are some pictures:
1) Rockers Top
2) Rockers Front
3) Rockers Back
4) Valve Tips with marks
5) Intake Valve Tip
6) Intake Rocker Clearance
7) Exhaust Valve Tip
8) Exhaust Rocker Clearance
I marked the valve tips with a dry erase marker on the intake and exhaust valves on cylinder 1 and set the lash. I rotated the engine and removed the rockers to check the rocker contact area on the valve tip and have a few questions.
1) The marks on the valve tips are a bit towards the exhaust side of the heads. The rocker travel on the valve tip is .075". After a ton of reading, it seems less rocker travel on valve tip is more important than the contact point being centered on the valve. Does my setup look okay or should I try to dial it in better?
2) The rockers seem to sit very close to the base of the screw in studs. I'm use to how the stock rockers sit on the previous press in studs which has a lot more space between the base of the rocker and rocker stud boss. I can turn the rocker adjustment screw about another half turn before it bottoms out on my current setup. Does this seem okay?
Below are some pictures:
1) Rockers Top
2) Rockers Front
3) Rockers Back
4) Valve Tips with marks
5) Intake Valve Tip
6) Intake Rocker Clearance
7) Exhaust Valve Tip
8) Exhaust Rocker Clearance
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