Ever have one of those moments when something you'd swear would work.... but... in the end you find out it won't?  I had one of those moments a few years back when I found that Mopar made two different versions of the same DOHC head.  One, a mirror image of the other, for the 2.4L 4 cylinder engine.  And I thought "Y'know, that just like a DOHC V8 setup".  So, IF they COULD be bolted to a block, what block would that be?  Well... after looking at the bore spacing of several different blocks, I found that they could ALMOST work on a Triumph Stag V8.  ALMOST....  It turned out the bore spacing of Stag blocks is not symmetric...

But hey, it almost worked!

Greg

Keep looking I guess. The Stag also has those damnable angled studs to deal with IIRC so that would have been a fairly major PITA to sort out. There are some web sites that list bore spacings of common engines. Good luck, it'd be a really cool motor if you can find the right block.

Jim

If you want 4 valve heads on a stag block the place to start would be the Triumph Dolimite Sprint head. The Triumph slant 4 was in effect half the V8. On the Sprint they used a single cam but 4 valve head. You will have the problem that you need a mirror image as well unless you mess around with the end of the head or have one banks exhaust in the valley! However as the head is from the same family the spacing should be correct and it used angled bolts.

With the stags short throw crank you could end up with a very revy engine.

Greg, your pic's are probably how the Volvo B230/234-end cylinders would look on a Rover. Considerable labors aside, the 907 appears to be a lot of bang-for-$. Fortunately there's other engines with very close bore spacing to BOPR. roverman.

Greg, What are those BC's for Stag? Maybe 4.25" and 4.125"? If so, Maybe easier to get Volvo B234's? roverman.

The Triumph Dolimite Sprint head would certainly be the easiest and most straight forward option but next in line would certainly be the 1986-199x Saab 2.0L, 2.1L, or 2.3L 16 valve DOHC head. The classic Saab 99/900/9000 block theses heads were used on was derived from the same 2.0L triumph block the that the stag engine was derived from, only Saab engineers fixed all the problems with it like the angled head studs, etc. This of course would make fitting them to the stag more difficult, but given their heritage the cylinder spacing, etc should be right on!
In fact I always wanted to build up a TR7 with a saab 9000 2.3L 16V DOHC turbo motor. In therory it should fit like it was meant to be there!

Gents,

I'm a new guy here, so hello and excuse me if this is all ready well-known info.

Somewhere on the internets (can't find it now), I read a story that Triumph once somehow fitted a pair of Dolomite Sprint heads  into a Stag and had great fun bombing around the test track for a day until it exploded "spectacularly". There was no mention of how they dealt with the left/right manifold issue, but I guess you could say it almost worked?

Krusty