does anyone make high compression pistons for a 170

andrew3408 said
It Will be for the street mainly with a 727 with a high stall and 355 gears and as far as the CR i would liketo have 10.5

That 727 is completely unnecessary, because a 904 will cost you far less parasitic drag and you'll likely NEVER break it with a 170.

Don't throw away all that horsepower for nothing...

Also, a 904 can be had with an OEM 2.74:1 first gear, something the 727 never had.
The 170 will like it...:D