Odd 2 piece motor?

[IN2VWS]

Hi Gurus,

I recently picked up a 356/VW? motor, that looks odd to my untrained eye.
It is a 2 piece motor, but it looks like the valve gear is from a later motor.
What are your thoughts?

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[James Davies]

It also has 356A heads, which implies the use of larger 82.5mm pistons/cylinders, which require larger spigots machined into the VW case, but of course larger spigots means there's very little material for the head studs/bolts. Either the case has been machined or the bolt locations in the head have been modified.

The 1955+ 3-piece case rocker geometry only works with 3-piece case followers and cam profiles, as far as I know. But of course VW cams and 3-piece case Porsche cams are not compatible.

So someone has done a lot of machining on heads, case or cam to get all this Frankenstein mess to work together. Prepare for some surprises when you pull it apart.

That said, it looks to be a 1953 Porsche case. Have a photo of the engine number and the 2nd case bolt bosses?

[finster]

could it be a denzel motor?
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[alanhall]

If these are 3-piece case heads then it means the studs have been relocated in the case. I believe this has been done before using plugs in the original case stud locations and then re-drilling and tapping the plugs/case for the 3-piece case stud locations. I have no idea how well this works, but I would be concerned about it. That said I think that it has been tried before but don't know how reliable it was. Perhaps if someone has tried it they can comment. I do believe that using 2-piece case cam, followers and pushrods would work fine if the the three piece case heads have been successfully installed.

[oldslow]

I don’t know much about 356 engines, so why does this look like an “odd” two piece motor, to me it just looks like an early 2 piece. What’s different about it? No snark here, I really want to know.
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[IN2VWS]

[oldslow]

Thanks!
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Looks like someone was trying to fool someone ..to me looks like someone took a regular vw 36hp grind down the #s on the stand and stamped the 546 you can clearly see the grinding marks ... than it looks like the relocated the head studs on the case to except the 356A heads if this was a real porsche one of a kind it would have the 356A steel stands these aluminum rocker arm stands didn't come 1961 or so .... and I see aluminum pulley should be cast... someone took alot of time to do this ...but to me it's a custom home project not a porsche factory engine....

[IN2VWS]

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Try looking on OMT PICTURES you will find pictures of his 36hp with later 356 heads just like your engine ..link below your engine would be great for the vintage speed fourm ... link below

https://www.thesamba.com/vw/forum/album_page.php?pic_id=63470

[Starbucket]

Where are the head bolts?

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What do you mean where are the head bolts ....on the 356 head the rocker arm stands mounting bolts built to the head stud nuts ..2 in 1 head bolts

[Starbucket]

So 2 bolt heads?

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Yes the head bolt nut is a 2 in 1 ..the head nut bolts has a hex for mouthing the head stud and has threads to bolt the rocker arm stand to .....

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[wagen19]

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[Starbucket]

I think that is a Porsche two cyl. air compressor note only the one carb.

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