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Twwin 50 gi dished intake valves both engins

D

dad2000

New member
was running at 4400 rpm when s

was running at 4400 rpm when started to loos rpm found port eng. no comp. 1 cyl stbd. eng. no comp. 2 cyl. both eng. dished intake valves at same time. WHY? machine shop has seen a lot of this in the last 18 mos. thinks lo octain related. aney advice on what to look for. both nunning good now. I dont want to run them until I know why it happned.
 
I was hoping somebody would be

I was hoping somebody would be able to help me with my problem. there has to be sombody out there with enough experiance to help me. HELP.
 
Thanks info was good. tulip va

Thanks info was good. tulip valves is what I ment. engins are 2000 5.0GI volvo (305 chev.)with volvo DP drives. installed after market intake valves in all heads-new knock sensors. no trip codes in computers. to predetonate and tulip valves I would think timing to advanced-lo octain fuel? I am wondering if computer program being used 1992 to 2003 is wright for todays fuels. should base timing be set back a few deg. to compensate
 
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