.090 overbore on '65 383?

A '65 Satellite for sale has .090 overbore on rebuilt 383, I thought .060 was the safe max

I wouldn't run an engine on a regular bases at 0.90. If it was my matching number engine and I only took it to cruises and weekend driver, then that may be a different story.

Only a sonic check can answer this question for you

Sounds like something someone else should buy.

This is the real answer.

But, as stated, what is your REALISTIC goal? Weekend runs with the grandkids for ice cream? Sure, run forever that way.

Bracket racing ricers? You'll embarrass yourself.

FAST racing? Could work, how much you want to spend?

If you really like the car and the price is right, I'd go for it. What's the worst that could happen? That you'd need to get another 383? Or sleeve the engine you have if it went south? I'm not even going to ask where someone got a 0.090 over piston set.

400 B engine pistons? Might even be a 400 block, so a casting number check would be in order.

What I think too, 400 piston 4.34 is .090 over 4.25

Here is the link:

https://www.clasiq.com/buyitnow/1965-plymouth-satellite/

Looks like a decent deal. Not sure the .090" over would scare me. I've seen one run at .125" over.

Never thought about using a 400 piston. Looking at what's available, it seems you could find an equivalent compression height. Stock it looks like the 400 would be over 0.030 in the hole compared to the 383.

A BB stick car in great shape for $20k?

If it were an AC car you'd be complaining about how I bought it already.

"this Plymouth remains unaltered and all original." Except for this and that and the other thing.

It could be that someone just "fat-fingered" .060, I suppose.
Looks pretty decent for $20K in this market; wouldn't surprise me if a dealer buys it and re-lists closer to $30K.
Agree, "all original" is an exaggeration, but I'm not seeing any big issues.
Like every car, all depends on an in-person inspection.

Nope. If you go to the link the OP provided on page 1 and scroll to the bottom, someone asked the question. The seller clarified that it is indeed .090 over.
Regardless, it appears to be a nice car at a good price.

i wouldn't think a .090" over production block would last very long no matter the use. of course another way to look at is if the body and chassis are very good then putting together another short block is nothing. the factory didn't recommend anything over .040". i also think that .090" over may be some kind of error. surely no machine shop would do this,....would they?

Well if the walls were .250 thick now they’re .205 big deal

My guess would be that the qualified machine shop that would bore it .090 would probably do a core check, but then again, maybe not. If the car has been used in parades for many of those 1,000 miles, and there was a problem, I suspect it would have already shown up. The biggest issue would be overheating on a street driven motor, and doing parades would bring that out quick.

The local dirt track guys were boring brand new motors +.125 then running them hard on the dirt tracks. I'm not sure I would be too concerned, unless a life on the track is a future expected outcome. Then I would probably plan on a different motor at some point. I give you permission to start building one just after the purchase of the car.

That looks great. I'd probably buy it and worry about engine specs later.

^^^ Yup, if someone has the right butt for that saddle, it's a cool car.
A '65 block wouldn't have a VIN, so if need be, I suppose if there was a good '65 383 block out there, you'd have a back-up.
The reason I questioned whether the Seller meant .060 was, as others have mentioned, I'd expect a sonic test before going that far.
Last guy I used for block machining & recip balancing was Lee Sixt, who will sound familiar to older TF fans.
He sonic-checked before going less than that on a late '70s 440; two I had from that era had fairly significant core shift, and a few holes got sleeved on one of them.

Had a 470 cu with 11.6:1, solid roller and -1 heads, engine block was a -71 383 block with 4.375 bore. Raced that engine for a couple of season with out any issues.

So it's bored to 4.34 which 4.342" is a standard 400 B piston. so is it probably/presumably .092 over?

If it's an aftermarket KB piston it is probably near zero deck so it might be a snappy performer. If it's a stock low compression piston, probably not so much.

It's an odd-ball size (for that compression height) for anything other than a 400B, isn't it?

Have you talked to him? maybe he hit the 9 instead of 6 typing it in