d17 LPG overhaul

Hello, been lurking here for a year, now onsite...brought a '69 D17 last year
that was parked in pasture for 20 years with a homemade car bullet muffler on it and needless to say, engine full of water. Been soaking pistons for a year, but still frozen. It is a factory LPG engine, and I do not want to buy an overhaul kit that loses compression below the factory 8.25 to 1 ratio. AGCO prices the original kit above $1600 dollars. Most other kits are from 5 to 700 dollars, but do not tell you the ratio. OKtractor lists a high compression kit for about $800 but when I called them they did not know the compression ratio or the psi per cylinder. I would like to achieve about 210 lbs psi since
is

180 psi is what the actual compression testing would show.  180 psi is AC service book spec.  210 psi is a gauge that reads high. Any more than 180 psi you will have detonation issues and there isn't any higher test LPG that I am aware of.  The last series 4   D-17 was built in Spring of 1967.   1969 was the third year for the One-Seventy ( summer 67-68-69)

Should run fine with stock compression. I remember an old timer telling me they would convert engines in the early 70's to LP by putting hardened seats in the head and plumbing the LP equipment.

And the loss of horsepower is what concerns me as I read some of these previous threads, it appears that the kits I see are generic for wd, wd45, d17, and 170 tractors, and there are no lpg piston kit available except for Agco, which were $1600 dollars last year, I haven't checked this year to see if they are even available from them. I don't want to do a overhaul on a d17 and have less hp than a gas wd. That's what spurs my interest in the high compression piston kit.

I got A and I 8.25 compression over bore pistons for my WD45. Pistons had numbers on the inside of for compression ratio. Also check out high altitude sets as they are generally about the same as lp sets