Is a DOHC head legal on a V4 in a vintage roadster??

[V4F STR 60]

Is a DOHC head legal on a V4 in a vintage roadster??

This has come up before in on other posts, but I don't recall a definitive answer.

The key words here are vintage, DOHC, V4, and roadster.  I'm not asking about SOHC, XXO, special construction, VOT, or anything else.  

Vintage, DOHC, V4, and roadster...  that's all I want to know.  Anyone?  

I have discovered a modern aluminum DOHC 4V head with the exact same bore and bore spacing as our Dodge motors.

Gracias, Pedro  

[maguromic]

Yes, but you cant use an adapter plate to mount the head to the block. Tony

[Steve Walters]

At the bottom of the SCTA/BNI home page there is a link to PDF form strictly about the doe's and don'ts of the V4's.   

Steve

[V4F STR 60]

Steve,

I pretty much have the V4F addendum memorized, but as it says on the first page, "If you should have certain modifications to V4/V4F engine blocks in mind and they are not listed in this Guide, they are probably PROHIBITED!".  I have also found, from personal experience, that even though it's in print, it is still sometimes open to individual interpretation.

To further streamline my question, I want to ensure that a modern DOHC head can be used in a Vintage Roadster.  For instance, in blown V4F, a turbo may be used in Special Construction, but a vintage roadster must use a supercharger.  Just hoping for 100% clarity that this isn't the case with an aftermarket head.

Thanks, Pete

[panic]

I thought almost all of those ancients had staggered mains, where the bore pitch differs based on whether a pair of bores had a main between them (#2-3) or not (#1-2 & 3-4).

[V4F STR 60]

They do, and so does this head.  That's why I'm so excited!

[maguromic]

I want to ensure that a modern DOHC head can be used in a Vintage Roadster.  For instance, in blown V4F, a turbo may be used in Special Construction, but a vintage roadster must use a supercharger.  Just hoping for 100% clarity that this isn't the case with an aftermarket head.

Thanks, Pete

Cant be any different than building your own DOHC head like Pete Ardema did for the model A and running it in his roadster and vintage coupe.  But no plates are allowed to adapt the head to the block (that's why he doesn't run his Subaru DOHC conversion anymore). Tony

[NathanStewart]

I belive the general thought is that a head is a head.  Mechanically, what makes a "modern" head any different than a "vintage" head?  All the same basic vintage rules appy to all vintage engines.  You could run a Wayne/Fontana head on your Jimmy or you could weld together two aluminum Yates BBF heads.  Or if you're lucky enough, you find a stock DOHC head that "fits" like it sounds like you have. 

I think this is usually where DW says to contact the appropriate committee chair as listed in section 16 of the rule book. 

[dw230]

 

DW

[wobblywalrus]

That is an interesting project.  Can the short block be built to handle the power and high rpm potential the cyl head will provide?

[Stan Back]

Wobbly --

I think with the Vintage engines, they're looking for the breathing potential, even at subdued RPMs.

Stan

[Grant Borman]

What is the bore spacing of your 4 banger?

[Buickguy3]

   Nathan,
  Did I miss something here? I thought in a vintage engine the camshaft had to remain in the original location. A new can of worms here? Hmmm, twin cam OHC 4 valve straight 8. 
   Doug 

[johnneilson]

I am waiting to see Ardema put 5 valves in each hole.

Read the rule book, if a flathead motor, cam in the block along with the valves.

Lots of stuff to play with. The bottom ends can be built up to make some HP, it just takes money.

John

[Stainless1]

... Read the rule book, if a flathead motor, cam in the block along with the valves.

Lots of stuff to play with. The bottom ends can be built up to make some HP, it just takes money.

John

John, V4F reads that way... V4... not so much...