All the reading I've ever seen on this forum said that .30 over is max bore on a 289. Have you ever heard of .60 over on these? Would there be any meat left?

 

4.060 on a small block = no good, for a 289/302 the general rule is 4.030 i know people with 351w's that go witha 4.040 bore and that is the absolute limit, is the block already bored over, if not why not just use the standard bore and make some power the old fashioned way, its more expensive but thats what i do with my engines...

 

Alright, here's what I know:

Just got back from my mechanic. He's very trustowrth and has owned many classic Mustangs, including his current 70 Mach 1 since 1974.He uses a local speed shop friend of his to do all his rebuilds. I sent him my car that I've owned for just 1 year, 67 289. I was always under the impression that the motor was the original. Come to find out, the machine shop noticed something strange: He seems to believe the motor is a factory reman from way back, like when the car was almost new. Can't remember what part (cank, flywheel, something....) was gold in color, indicating to him that it is a factory reman engine. He said it is already bored .60 over and swears its fine, plenty of meat. I've been driving it this way for some time and the previous owner has as well. I already bought my new heads (AFR 165cc) and Cam (Comp XE262), so there's no turning back now really....I asked "Are you sure the .60 over is going to be okay" and he said "Absolutely". What I don;t know is if its sleeved or what, but he definitely said the factory remans were usually bored .60 over....

Kinda threw my day off here. The more I peel layers off this old car, the moresurprises. Trying to remain positive and think it really doesn't matter...since I'm not racing it, its just a cruiser, I should be fine. any thoughts? Should I geet an aluminum radiator?

 

No such thing as a factory remanufactured engine, and certainly not one that has been bored .060 over. That is insane. Good luck with it.

 

I believe these products are considered "factory remanufactured" : http://www.fordpowerproducts.com/pow...ts.do?item=1_5
They are the productsForddealers use for warranty replacements. I have no hand's-on experience with a sixty over 289 but I've always heard going that far over creates cooling problems at the very least.

 

theresno way the car is 60 over and fine espp if its a street car the ford v8 small block etc are thin wall cast which literally means thin cylinder walls the mechanic has no idea what hes talking about[&:]

 

Yes, they are remanufactured, but there is nothing that says they are FACTORY remanufacuted. That would lean one to believe that FOMOCO remanufactured the engine which is not the case. 60 over is insane on a 289. 40 over is the most, and 30 is what is recommended.

 

Here is some interesting information on 289 engine building. :http://www.mustangsandmore.com/ubb/B...mallBlock.html
He says you can go to seventy over.

 

We go .070 over on 289/302 blocks all of the time on our race motors.

i know i wouldnt take a chance on a motor that was 60 over

 

What "Factory" are you talking about? These products are distributed solely by Fomoco. Are you insinuating that Ford goes to somebody like Jasper for waranty engines? Have you ever seen these engines delivered to the dealer in a truck that says "Ford Motor Company authorized remanufacturer" or purchased one? I have.