2.0 cylinder heads with 44 & 38 mm valves, combustion chamber CC’d to 48cc’s.
Any cracks were properly repaired. I had these done by Mark Stephens High Performance years ago and they have been on a shelf in a box since. I’m selling my 30+ year collection of Porsche parts. I can take more pictures if you’re interested. $1700 plus actual shipping.
Click to view attachment

any port work, guides, springs? Seats likely done with the valves?

Yes, port blending, new guides and springs

Bump!

How long ago were the springs installed and sitting in storage?

Seems like a smoking deal.

Wow, just did a bit of searching regarding Mark Stephen's and you've had those sitting on a shelf for 25+ years!

Looks like there is a whole backstory behind his going out of business...

Who's "Norm"?
He appears universally disliked...

What was the application intended to be for these?

Have the chambers been welded up?

How much have they been flycut? (milled).

Looks like they should produce a flat top 2055 at 10.4/1 and a 2255 at 11.3+

I'd bet all new parts regarding guides, valves, springs, retainers, locks were used.
On something that nice they should be.

Do you know if they replaced the seats?

Never mind!

Removed non-sales discussion I had with sixaddict that added nothing to the for sale add.

Cleared the air with Six via PM.

No mod opinion needed.

Six was defending his friend as is proper...

I was NOT disparaging Perry (IronHillsRestoration) at all.

Head are nice looking!