Topic: 750 manley valve train parts info

[Garage_guy_chris]

Hey everybody. I bought a built head a while ago with a full NOS manley stainless valve train in it. I was just looking for some info on the parts. I havent been able to find any specifications or info on these goodies. Im mainly curious about the valve springs and what sorta seat pressure and opening pressure they have

[Don R]

We'd love to see a picture of that!  You would probably need to measure the spring pressure as installed.

[Garage_guy_chris]

Well im finally getting back to the engine build at hand. its been a rough go for the last while... anyways i took a look at this head today and snapped some photo's.

I don't think this head has ever been used i took it down and found:
-Intake valves marked      "MANLEY 9-8"
-Exhaust valves marked    "MANLEY 1-8"
-Look to be iron/stellite guides both intake and exhaust have seals
-Retainers i believe are stainless? Not sure of origin maybe Manley
-springs seem a fair bit stiffer than stock but i really need to measure them to be sure.

Ive also had time to dredge through google and here sohc4.net to find some more info on these Manley valves..

-early valves had soft stem tops and would mushroom from the lash adjuster.
-adding lash caps remedied this
-later valves were hardened? the stem tips on these look a little different then the rest of the stem i think these may be later....
-Found one report "I wanted to reuse the Manley valves that already had 50,000+ miles on them"
-Found another report "It has long had Manley SS valves so those were OK to regrind"

Couple questions:
- The head has stainless retainers and possibly hd springs are these likely manley too?
- Was this Manley gear a package deal or individual parts?

Here are the photos.

[Jerry Rxman Griffin aka MuthaF'er]

When I used 32mm Manleys as intake replacements in late 76 I purchased my stuff from Yoshimura. At least I think all of it came from them. The springs were S & W. No appearance of mushrooming as they were prone to after almost 30,000 miles.

[PeWe]

Lash caps if the valve stems mushrooming. My inlet valves like to do that (F2 34mm used as over size valves). These valves might have softer tips?
MRieck helped me to get correct lash caps. Valve stems tips grinded flat by the machine shop when refurbish the head and replaced all valves.  Easy to replace the caps when they have got dimples. Exhaust valves no caps.

[Garage_guy_chris]

I measured up the springs tonight and came up with:

Mystery springs possibly Manley   
@ 1.440                          60 lbs seat pressure
@ .345 lift                       180 lbs seat pressure
@ .325 lift                       170 lbs seat pressure

Also figured out the valve retainers are likely stainless steel Not titanium.

Would love to know exactly what the springs and retainers are? they may be Manley or maybe something else. It would be nice to know but will likely never know. 

after all my measuring and messing around this is the head going on the engine. I will keep an eye on the valve stems annually and if theres a problem deal with it then.