piano top pistons ok to use with 121 head?

[Son of Marty]

Please post pictures of pistons and head cause this should not work with out mods.

[Conserv]

3 hours ago, Djthom said:

I recently purchased a 73tii and pulled the head today.  I was very surprised to see it had  121 head with Piano top pistons.   Doesn't look like any modifications have been done.  The engine block, injection pump and plenum are from a 74 so this can't be the original head.  I dont see any signs of conflict 

 

Maybe as echappe suggested above there were 2 types of Piano top pistons?

 

I have the original engine to rebuild but need this one to last me a bit longer. S

Yes, how about some photos? Are you certain they’re piano tops and not bathtubs?
 

Regards,

 

Steve

 

Edited December 15, 2019 by Conserv

[Djthom]

Here are the photos.  I took engine apart due to leak in front cover but was otherwise seemingly running fine.  

 

I'm dealing with Frankenmotor here.  I have the original block and will do a full optimal build  but I'd like this current engine to keep going until I get some other projects completed 

[Djthom]

I measured the dome height of the piano. It's around 4.5mm.  The previous owner told me today he had driven the car like this over 4 years estimate 7000 miles.   I don't understand why I don't have any signs of contact. All the threads I've found on the FAQ state this combo won't work.  

 

Is it possible they put a different crank into this frankenengine?  Could I tell by just measuring the stroke?  I'm not ready to pull the bottom end

[tech71]

26 minutes ago, Djthom said:

 I'm not ready to pull the bottom end

Are you sure about that?

Is that corrosion/pitting there in the bore?

Whats it look like with a piston at TDC? Flush? sticking out? Recessed?