1988 block 4" to 4.125" overbore...hmmm

muh'stang · Dec 21, 2008

just check it out...this guy is a reputable poster on another forum I frequent more often than here. TMeyer Projects - 302 Overbore bored a 1988 block 0.125" over just for chits n giggles

jrichker · Dec 21, 2008

Can you be sure his sonic test gauge isn't wacko?

The small block Fords all used thin wall casting techniques and didn't take to large overbores. All the reports I have heard is that
.040 overbore is the max safe figure for street driven cars with stock blocks. Some guys have said they did .060 overbore with
stock blocks, but the reliability figures are doubtful

muh'stang · Dec 21, 2008

well he builds ford engines...im not sure if he has only one sonic guage....but im sure if it was wacko he would have run into some problems by now no?

I was with the same thought as you are...that is why i posted this, it threw me off.

muh'stang · Dec 21, 2008

I sent him a pm..we'll see what he says when i get home tonight if he answers.

5spd GT · Dec 21, 2008

TMeyer knows his stuff. I have dealt with him with some 351M/400 stuff.

muh'stang · Dec 23, 2008

here is what he said

That was not an aftermarket block. Just a late model block.
We were just playing around, we never did check it all the way around and up and down the bore.

I asked him if he still had it kickin around and if he wouldnt mind scopin over it a little more.

90lxcoupe · Dec 23, 2008

i wouldnt trust it...

FastDriver · Dec 23, 2008

If it's a stock block with no tricks, it's not possible. I've never hear of anyone going beyond 60 thousandths. Unlike aftermarket blocks that don't have water passages directly between the cylinders, if you took a stock block out to .125 over, I'm pretty sure you would hit a water jacket.

Chris

muh'stang · Dec 25, 2008

FastDriver said:
If it's a stock block with no tricks, it's not possible. I've never hear of anyone going beyond 60 thousandths.

Ive youve never heard of anyone going more than 60 thou then its impossible for you to say its impossible...as you have no direct personal experience.

I dont even know if he bored the whole block or just one cylinder. He said he didnt sonic check the whole thing, only a couple areas.

FastDriver · Dec 25, 2008

Oh... well I'm sorry for posting then. Since we're in the world of academia and theory then sure... you can bore it out to whatever you like.

muh'stang · Dec 26, 2008

dont take offence to it man....i remember a few years ago i was asking on another forum if the SHO 3.0/3.2L shared a BH with the RWD 3.0L. Everyone said they didnt, i took the peoples word for it and let a perfectly good running SHO write off pass me by and never bought the 3.0L ranger splash to swap it into. A couple years later I find out they do interchange and ford put one in a ranger once. Hence my bitterness.

maybe this was just a freak of nature block, and/or he only bored one cylinder and sonic'd one spot. Who knows, i asked him all this and havent got a response.

FastDriver · Dec 27, 2008

Ok, let's say you don't hit a waterjacket... Is there a point to it? Windsors, especially older ones, have notoriously thin cylinder walls. So you end up with a motor that has cylinder wall flex. You going to run into problems with ring seal, distortion, possibly cracking. You're likely to lose any power gains you make from the added displacement. What would be the point? The windsor block is a dime a dozen. Just get another one.

Maybe if you sleeved the block you could get away with it, but again why put that kind of money into a stock windsor block when you can practically get them for free.

Whatever floats your boat though man. If you decide to go for it, then by all means keep the forum advised of your progress. You'll be the first I've heard of to ever give that much overbore a shot. Until then, I'll continue to advise others to stick with less than .060"

Good luck in your quest,

Chris

1988 block 4" to 4.125" overbore...hmmm

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