Board index Flathead Power-Technical Questions, Answers, and Suggestions Big Twin Flatties UL valve covers

UL valve covers

Moderators: Curt!, Pa

Post Fri Oct 28, 2005 8:17 am

Posts: 54
Location: Portland, oregon. USA
Could someone please tell me if UL valve guides will fit in the 45 WL lowr end or if not how may the UL valve covers be adapted to fit...
Thank you...

Post Fri Oct 28, 2005 8:39 am

Posts: 1644
Location: Interlaken, NY USA

Interesting question. Yes the blocks are interchangable. The early screw type covers would screw on 45 bases, and the later UL tappet blocks would fit in the 45 engine case. So, you could go either way I guess. 8)

Post Fri Oct 28, 2005 1:35 pm

Posts: 2399
Location: atascadero cal usa
the guides from a ul are way too long for a 45

Post Fri Oct 28, 2005 4:45 pm

Posts: 630
Location: belgium
Yeah maybe the 38' down covers might fit the "45 (short)
Panic will know...we hope!

Post Fri Oct 28, 2005 5:08 pm

IIRC the assembled height of the stacked covers is the same - direct bolt-on. You'll need fin clearance grinding behind the blocks.

Post Fri Oct 28, 2005 7:01 pm

Posts: 54
Location: Portland, oregon. USA
The final concenses would be that the tappet blocks for the larger covers would bolt on to the WL cases but theres the opinion that the blocks would extend into the cam chest too far.....??...
I don't suppose it would be too hard to carve/modify the tappet blocks to clear the K model cams....
They are made of only what appears to be pot aluminum....
Ad>>>>What years tappet blocks fit the larger covers...Please....??????........

Hey thanks guy's for all the valuable info.....


Post Fri Oct 28, 2005 7:37 pm

Posts: 2399
Location: atascadero cal usa
your bad wording
you called them valve guides

the tappet guides will fit the valve guides will not

Post Sat Oct 29, 2005 12:32 am

Posts: 54
Location: Portland, oregon. USA
Yes ...It's entirely likely I'll make plenty of mistakes...You'll get some of that in life..
Never the less...I'm going to build it even through the stupid mistakes....
Beyond that....The lifter guides I have...Which I assumed are early K model are pretty small compared to the UL three piece valve covers....
It's a no go situation...
I have a set of UL lifters/tappets and a set of 45 lifters/tappets and yet another set of iron head lifters/tappets...All of them fit nicely into the lifter blocks I have...
The iron head ones seem to be the lightest but are also the most damaged....
I want to use the large valve covers so I guess I have to find a set of 45 lifter blocks to check em for fit...Seems a waste but I'll do it if I have to....
Panics book,pg. 8 say's.."If you have the larger 1930-38 VL/UL covers you can use super-duty springs (crane,crower,ect) for this one you will also need some of the UL spring stack parts. The bigger valve covers screw right on to your tappet blocks, and are very attractive, but will require clearence grinding on your fins and cylinder base flanges."
OK..Great...So I must then have some other type of SV engine lifter blocks because the valve covers dwarf the blocks....
Looking at a set of SUPPOSED 45 valve covers next to the UL types I have the difference is very apparent...
The only choices I seem to come to is buy all the related parts and make the comparison and then resell everything I can't use or ask seemingly stupid questons of those more experienced than I...Admittedly nearly everyone on the planet...
So....That said.....
Anyone ever put big valve covers on the lowly 45..??...
Beyond that:...
Dr D.
The project is of course to put this whole shooting match togather with the KH cylinders and standard K heads as we have discussed and the question is very interesting....
To me...This is as much an artistic work as it is an insane engine building project and a whole lotta fun...Thanks for the help...Every time you throw in your two cents worth it seems more like fifty dollars to me....
Seems I'm gettin fixated on those 897 flywheels your selling....
Dr. D used regular WL pistons on Frankie and ended up with a very high compression rate...
Which piston would you recommend for this, for lack of a better word, project...All things considered...???....
Aska lotta questions for someone from Ore-e-gon now don't I....

The eternal pain in the Azzz


Post Sat Oct 29, 2005 5:50 am

Posts: 630
Location: belgium
Ame I'll try to answer the question I understood : WL , VL and early UL tappetblocks are all interchangeable/samelike.
Late UL have no thread for the valvecovers but also have the 2 mountingholes.
XL have no thread and only one mountinghole .
K tappetblocks also have 2 holes but smaller thread and all tappet/lifters will fit in all blocks the XL ones are the lightest.

Post Sat Oct 29, 2005 6:37 am

The Truett pistons will give slight positive deck with 4-5/8" stroke, easiest thing to use.

Post Sat Oct 29, 2005 8:32 am

Posts: 2399
Location: atascadero cal usa
mistakes will be made
if miss wordings the worst your doin good
i was just clairifying my answer to you

Post Sat Oct 29, 2005 5:00 pm

Posts: 54
Location: Portland, oregon. USA
Hey thanks Steph...That did clear the deal up...So I do have a set of K tappet blocks here...Too bad...Their drilled for oil return to the cases..
Their nice too....
No difference..I'll keep em instock....They'll only get more valuable as time goes on...
Thanks Panic...We'll be doing buisness on that set of flywheels...Real soon....
I'll have to get a new set of pinion and sprocket shafts as well...
Got em...??...



Post Sun Oct 30, 2005 1:04 am

Posts: 630
Location: belgium
Ame they can all be drilled for oil to cases, has been discussed here Gus put the pics, improves breathing off the cases.

Post Mon Oct 31, 2005 12:45 pm

Posts: 54
Location: Portland, oregon. USA
Hi Steph.
"The Pics"....
Is there a refererence title for the posting which shows the pics...???...
I already found a set of NOS tappet guides...not sure just yet if their drilled but their nice...

Post Mon Oct 31, 2005 12:52 pm

Posts: 367
Location: Bergen, Norway
Think this is the post, but a lot got lost when this board was renewed.


Post Mon Oct 31, 2005 12:58 pm

Posts: 367
Location: Bergen, Norway
And here are the images.




Post Mon Oct 31, 2005 9:43 pm

Posts: 801
Location: Planet Earth
Allways wondered if those hole would help to relieve crankcase pressure or aid in the oiling of the lifter or both. What would the general opinion for them be? Been thinking about doing it to my UL. Getting near the end of ridding season up here and I am planning on tearing down the UL to see how it did with the modern rings and a few other mods I did. Plus I want to put in a new set of lifters and make a few more mods.

Got over 9000 miles on it this season after last Winters rebuild and still running great but I am never satisfied.


Post Thu Nov 10, 2005 6:27 am

Posts: 54
Location: Portland, oregon. USA
Hi list:..
thanks for the info and yes my cases do have the holes..Incidently I did find a set of tappet guides for a WLA..Brand new parkerised...No oil holes...go figure.....Ohhhhh well....

Post Thu Nov 10, 2005 7:13 pm
Pa Site Admin

Posts: 5552
Location: Ohio USA

Early 45 tappet blocks didn't have the oil holes. Pa

Post Sat Nov 12, 2005 3:08 pm
don User avatar

Posts: 571
Location: Spokane WA USA
Here is some archived talk on tappets. ... pet+blocks



Return to Big Twin Flatties