[Roadsters] Valves leaking while cc'ing

[Steve Ehlers]

Hi,
 This is typical of  poor quality  machine work .Even with a slight 
interference angle made on seats and valves ,there should be NO
leakage . If the head wasn't assembled you can seal the valves with a 
thin grease coating ,as we do when building a combustion chamber matched 
high Performance head set up .If the valves had been lapped in during 
the valve work a problem would have been seen in contact or possible run 
out on the seat .Quality machine work can't be assumed by the end user 
if  you don't know the details of a quality job .
 
 For example , did you have new steel intake seats installed ,and at the 
right valve height ? Can the Machine shop even provide you with the 
correct stem height dimension . I doubt it !
Good Luck ,
Steve Ehlers
www.risingsunperformance.com