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HELP!!! 10.5 :1 Pistons

Posted: Wed Jun 25, 2025 11:28 am
by Koos
Hello All! Newbie here, excited to be part of the Toro family!

Early production 1967 Toro deluxe. 84K miles, 1st time bottom end has been opened.

My motor is getting a complete overhaul, balance, blueprint etc. Time to order pistons, nut I cant find any 10.5:1. Every call I've made I find myself explaining 66-67 Toro 425's had 10.5 to 1 compression ratio, which I find the person on the other end of the phone doesn't agree.

Can anyone point me in the direction to find some pistons? and a new flexplate. The ring gear is starting to show some signs of wear.

Re: HELP!!! 10.5 :1 Pistons

Posted: Sat Jun 28, 2025 7:49 pm
by Slick66
Try this place and call them https://egge.com/product/oldsmobile-425 ... -125-bore/
I have a 66. I'm looking for a factory replacement oil dipstick and I haven't had much luck on that. I would take chrome if I had to. Do you know a place?

Re: HELP!!! 10.5 :1 Pistons

Posted: Mon Aug 04, 2025 2:11 pm
by Koos
Hi Slick 66,

Thank you for the Egge suggestions, and sorry for the very late reply!

They (Egge) were only able to offer 10.25 to 1. I ended up going with ESS forged aluminum pistons. They arrived in 7 days and look fantastic! Everything is now being balanced. Except I have not been able to find a flexplate. If you have any ideas; please let me know.

I looked through Fusicks catalog for a dipstick. Nothing for 66-67 Toro.

I'll ask as I'm searching for a flexplate.