Engine won't run
Seasoned HDF Member
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From: poway
http://tmanperformance.com/wp-conten...ker-Relief.pdf
Stellar HDF Member
Joined: Mar 2012
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From: Columbus, OH
BTW. It's not the lift of the cams.. It's simply the arch the roller makes under the top cover.
http://tmanperformance.com/wp-conten...ker-Relief.pdf
http://tmanperformance.com/wp-conten...ker-Relief.pdf
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
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From: poway
A leak test will tell you if you have the valve lifted off the seat but it won't tell you if you have any extra clearance.. You really should set the cover up so that it has at least 0.060" clearance to allow for assembly and functional tolerances
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Joined: Mar 2012
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From: Columbus, OH
Cool, Thanks Max. Going to check this out this weekend. The 0.060" would a little clay be a good way to measure this? I saw a comment on anther post where you said rocker clearance was a common issue on early motors. Did castings get better over the years? I replaced my upper and lower rocker housings with new black lowers and contrast cut uppers. I did look at the lowers before I bolted them on and it looked like there was more clearance for the spring than my OE 2011 ones? One more quick question while we are on the subject of clearance. I was advised to open up the tops of my push rod tubes with a 5/8" bit so the push rod doesn't contact the tube, since I have a 0.625" lift cam, how far down the tube needs opened up?
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
Likes: 7,968
From: poway
Cool, Thanks Max. Going to check this out this weekend. The 0.060" would a little clay be a good way to measure this? I saw a comment on anther post where you said rocker clearance was a common issue on early motors. Did castings get better over the years? I replaced my upper and lower rocker housings with new black lowers and contrast cut uppers. I did look at the lowers before I bolted them on and it looked like there was more clearance for the spring than my OE 2011 ones? One more quick question while we are on the subject of clearance. I was advised to open up the tops of my push rod tubes with a 5/8" bit so the push rod doesn't contact the tube, since I have a 0.625" lift cam, how far down the tube needs opened up?
I suspect that the rocker clearance you are mentioning in another thread is for valve springs. On later bikes they still need to be checked if you are running straight wound springs.. Most later heads run beehives which typically have lots of clearance. Covers do have more space for straight spring as some of the SE heads used straight springs..
I would guess 3/4 inch to 1 inch on the depth.. They only seem to rub right at the top near the o ring ring. I'm pretty bad at this.. Kind a go "yeah that looks good" and stop. I've seen em rub on dead quiet motors so I question it's value but do it anyway..
Stellar HDF Member
Joined: Mar 2012
Posts: 2,008
Likes: 596
From: Columbus, OH
I'm gonna guess that rocker arm clearance isn't going to be a problem with these covers
Opened up the push rod tubes with a 5/8" reamer I had
As always Thank You Max for taking the time to answer my questions
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