Valve springs/specifications for a 40 Merc
 

As mentioned in another thread, I have my 40 Merc motor down for a valve job since it appears I have some valves hanging up. I'd like to check the valve springs for proper load. Does anyone have the spec? Also can I get a recommendation for buying replacements if needed? The previous owner said that he installed a "3/4 race" cam so it may not be stock. I plan to check the lift to confirm. I see that it already has adjustable lifters. Should I buy some higher load springs if the cam is, in fact, a performance version?
Thanks,
Dan

Re: Valve springs/specifications for a 40 Merc
 

My Motors Auto RepairManual calls for ("minimum valve spring pressure, pounds @ inches, length new --- 37 @ 2 1/8")

Vergil

Re: Valve springs/specifications for a 40 Merc
 

Ford book says "36-40@ 2.125", discard limit is 30.

Re: Valve springs/specifications for a 40 Merc
 

If you do in fact have a "3/4" cam it might be cheap insurance to put a set of Zephyr springs in.

Re: Valve springs/specifications for a 40 Merc
 

Thanks guys. It took me forever to get the LH head off last night. I hammered, Kroiled, made up some pullers that fasten into hollowed out spark plugs, even tried the old "rope trick". Finally got it off after about 3 hours. I will get the valves and spings off this week and give everything a good going over.
Dan

Re: Valve springs/specifications for a 40 Merc
 

I agree, Valve springs are cheap so install some new ones.

I use Zepher Springs in all my engines with a after market cams. They work very well unless you are running a full competation cam, which would be too wild for the street.

If your engine in fact does have an aftermarket cam, stock springs may not be enough.

Chris

Re: Valve springs/specifications for a 40 Merc
 

Chris,
Thanks for the feedback. Where's the best place to get a set of Zepher springs?

Re: Valve springs/specifications for a 40 Merc
 

Reds Headers has a repro Zepher spring, they are running fine in my 59ab... Karl

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.

Re: Valve springs/specifications for a 40 Merc
 

Thanks for the update Flathead.

Vergil