I have a head off of a b23 engine.

I have a 1980 volvo GL w/the B21 engine w/ K Jet Injection. The B21's head is cracked.

Can I use the head off the B23 w/ the K Jet injection? I read somewhere that the injection would have to be ugraded due to the B23 Head not having the holes for the K Jet. Is this true?

My son converted a B23 head to K-jet several years ago by having the existing casting "bosses" drilled & milled for the K-jet injectors. (This went back on the b23 block. Don't know about the b21 to b23 head issue.)

I can't quote a price as it was done at a semi-DIY shop. But my recollection is that it was a fairly simple job on a Bridgeport machine. I believe there are only 2 diameters plus a seal groove involved.

I'd try for a couple of machining estimates if it was mine.
--
Bruce Young,
'93 940-NA (current)
'80 GLE V8 (Sold 5/03)
'83 Turbo 245
'76 244 (lasted 255,000 miles)
73 142 (98K)
'71 144 (track modified--crusher bound)
New 144 from '67 to '78
Used '62 122 from '63 to '67

The B23 is almost certain to be an LH-Jet head, so will not work with your K-jet parts. The cost and hassle to convert to LH-Jet to suit the head would be more than your car is worth. Best to find a sound B21 K-Jet head.

Due to a stripped plug hole, I got a B21 head rebuilt at a big cylinder head specialist shop (Central Coast Cyl. Heads, Atascadero, CA). Cost was $250 including the welded and retapped plug hole, a complete valve job (3-angle), new seals and a slight skimming to true up the gasket surface. It looked like a new unit, and they even got the valve clearances right. This may give you a $ reference point in case a used head needs to be brought up to par.
--
Bob (81-244GL B21F, 83-244DL B23F, 94-944 B230FD plus grocery-getter Dodge minivan, MGB, and numerous old motorcycles)

If the B23 had K-jet, then it will work just fine. I believe there may be a small difference in compression due to a larger combustion chamber, but it won't be enough to notice.