some random high compression pistons,
to tell what piston exaxtly this is we will need to both sides of the piston.
definitly not oem honda
maybe some 12:1 cps or so

 

What motor are those in? Look like CTR's to me. The piston sits below the hole and just the dome is positive so its got to be a B16 or GSR stroke.

 

Yup looks like CTR's to me too, We need moar pics though.

 

Aftermarket forged pistons with ~7cc domes. Brand is xx, take off oil pan and look under the pistons. Cast piston tops are not that smooth.

 

damn only pics I have. was told it's 12 : 5 high comp will be doing headgasket again with new head studs this time will probably drop pan and snap more pics

 

also it's a b18c1

 

Trying to determine how you can tell they are smooth when they are topped with carbon.

Also some builders will sand the sharp edges off CTR pistons when they build a motor.

 

is the carbon excessive ? detailing any immediant problems ? sorry quite new to motor work

 

No that looks normal.

 

This is why...

Look at the OP's pistons...

Then look at this...



Specically the exhaust valve reliefs, different design, appearance, etc.

For sure, theyre not OEM cast pistons. Regardless of what could have been sounded down.

 

There is hardly carbon build up on those pistons the OP posted. Trust me I've seen so many forged pistons that are shaped like that for the Hondas.
Sanding will only get so far on hard cast pistons and wont get the curves on that piston to be uniform unless it's machined, but if that person spent the money and time machining cast pistons might as well bought some forged in the first place.

 

My computer must suck

 

Those look like my cp 12.5:1 compression pistons

 

clean them up and see if they are coated with anything.

supertech are grey color...

spray some carb cleaner and let it soak then clean with a rag

some pistons have a stamp on top also

 

I will be doing headgasket again along with rebuilding head here soon so we will find out with more pics . I'm pretty sure they are forged tho