Can you convert an aluminum Hemi block & make it fit wedge heads? Apart from the top row of Head stud holes, are the others the same as a wedge? If so, can you weld up the top holes, redrill for wedge & cut away the excess aluminum for pushrod clearance? I've got a lead on a near-new Indymaxx Hemi block, but I have Wedge stuff.

You don't have to do any of that, just plug off the drain holes in the corners of the block. The Wedge heads will bolt right on.

...or not. There is the whole inside row of head bolts (studs on a Hemi) and alternitive oil returns that need to be attended to. But for the most part the lifter location, spread and lifter bore size, cylinder spacing, oil feed holes and remainning Bolt locations are similar. Keep in mind it needs to be a Street Hemi type block. The raised cam blocks things start to move, Lifter bore size and spread.

Bah....... who needs the inner row of head bolts anyway.

I could of sworn the inner fasteners were relocated. Isn't there a version of the B-1 heads that have the Hemi bolt pattern?

Don't tempt fate or Murphy, get the correct block for the heads you want to use, or visa a versa

This is a pic of a hemi head gasket on a wedge head.

Bolt hole is off juuuuuuuust that >< much.

That big coolant hole/gasket situation also looks a little problematic.

Evidently I have some kind of ba5tard block then. I have a Hemi Mega Block, that has the upper row of bosses (inside the valley), and I am running it in my car right now, with 440-1 heads, using Fel-Pro 1105 gaskets. This block was still in the new in the Mopar crate when I got it from the original purchaser, who bought it from Indy Cylinder heads. I had to plug the drain holes in the corners of the block, otherwise no issues.

Sounds like a Wedge Megablock to me. It’s the same casting as the hemi, just machined different.
The hemi oil return holes get covered by the head gasket and head. I believe there are felpro gaskets just for mega blocks.

Years ago Tom Hemphill, RIP, offered to convert a hemi mega block I had into a wedge and made it sound simple.

This is felpro 1039

1039 is right, I bought the 1105 and it wouldn't work. They're sitting on the shelf. I just checked my receipts, but had 1105 on the brain earlier. I never knew they were the same block. I bought this one from Tom Benzenhoefer in OH and he told me the Wedge mega blocks didn't have the drains in the corner. He had bought two of these blocks from Indy and was supposed to build two motors for a customer, but only one ever got done. Now I'm wondering if Indy got the block as an unfinished casting, or ???

I have two other Hemi Mega Blocks, one I bought new (World) and an older one from an S/S car. I never tried mix matching pieces between the Wedge and them, so I learned something.

Funny you mention Hemphill, I just got done fitting a sheetmetal tunnel ram he built on this motor. Older piece, but nice, and certainly an upgrade over the 440-3. I have the receipt from when Tom built the intake, and he did a set of Max Wedge port 906's at the same time...so I can see why the Hemi to Wedge deal would be something he'd consider "simple".

I think B1TS heads have hemi pattern

Yea and the rest of that stuff too...including push rod clearance

I already have an Indymaxx wedge block & i can see it was cast as a Hemi block & has the inner head bolt area cut down to allow room for the pushrods. If its only a case of welding up the holes & retapping them in wedge position, maybe helicoil the threads, then Im thinking its do able. The block i'm looking at is very well priced for here down under.

Its do able and based on your location probably the most cost effective option. It is that they dont "Just Bolt on" . Make sure the differencs betwene a Hemi Block and Wedge block (relitive to cylinder heads) can be corrected and go for it.

Top outboard water holes are bigger on the Hemi, top studs holes will need to welded up and tapped

So as I see it, i only have to fill the extra oil return holes at the bottom & the 4 holes along the top on each side, deck the block & redrill the top holes & retap. Then cut the excess off & im done.

Lay a 440 gasket on the deck to check water holes

The oil return holes will be covered by head gasket/heads.
If you want you could tap and put in a 1/8 pipe plug or a set screw.
This is what I was told to plug and add new holes on cast iron block.
Tap the existing holes, make and install threaded plugs. - in your case
aluminum plugs. Drill and tap new holes - wedge pattern.

Looks to me , like on this wedge KB block, the stud bosses don’t need to be removed, in case you go hemi in the future
https://board.moparts.org/ubbthreads/ubbthreads.php/topics/2767505/all/508-kb-b1-build.html