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Old 06-21-2010, 09:34 AM   #9
F1 Flathead
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Join Date: May 2010
Location: Brighton Michigan
Posts: 47
Default Re: Valve springs/specifications for a 40 Merc

I checked the lift on my cam and it is nearly stock lift. I can't check duration but my guess is that it is an Isky 77 or 88, not a Max 1 or 400 Jr which both have much higher lift. I checked the valve springs and they all measure over 40 lbs at 2 1/8 inches so I think I will try and use them. The lifters and guides were all covered with a real sticky substance (old, overheated oil?). I'm thinking that my problem will be fixed when I get it all back together.
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