[torinostylz]

I found a guy in desmoines that has great price on engine machine work. He can bore my 302 60 over (resulting in 399 cubic inch displacement) for under $100. He told me that i wouldn't need larger pistons, just bigger rings. Is this safe? Will it work? Will the pistons twist? I ran the engine on my desktop dyno and found it producing 450 horses at the fly when combine with a big 4bbl camshaft, intake, and mild porting...so i'm definitely interested, what do you think? <img src="graemlins/drunk.gif" border="0" alt="[drunk]" />

[Studebaker]

Don't walk away, run away from this guy! Who ever told you this or gave you this advice is NUTS. A .060 thousands over bore on a 302 Ford will only increase C.I.D by about 3 C.I.D. You Must replace pistons with the overbore or you will have a major oil consumption problem just before the ring lands break and you have a major engine failure. Use a reputable machine shop!

[Halloweenking]

399ci from a bore job, you'd have to start with 396, listen to Studabaker, run as fast as your legs will carry you. 302-399ci that one deserves an award

Like the Avatar too

HK

[DoubleVision]

4.060 X 4.060 X 0.7854 X 3.000 X 8 = 310.7 cubic inches. You would have to have a 4.600 inch bore to get 96 more cubes out of a 302 which would make the bore bigger than a 460. if this guy told you this then he doesn`t know how to add cubic inches very good. sounds to me like he`s just trying to get you to spend more money on him. Cubic Inch Formula: bore X bore X 0.7854 X stroke X number of cylinders =
I`ve heard some good ones before, but this one takes the cake. maybe ask him how is a 4 inch piston gonna make up for 60 thousanths extra clearance? can you say Carnage? may also wanna tell him to stay off whatever he`s smoking.

[ December 14, 2002: Message edited by: DoubleVision ]</p>

[stonedchihuahua]

wait guys I want you to figure this out.. what if he did the 6 thousands overbore and then stroked it.. how much stroking is required... hehe this should be good

[KULTULZ]

[quote]You Must replace pistons with the overbore or you will have a major oil consumption problem<hr></blockquote>

Not really...A couple cans of compression will solve the problem...And the piston skirt would never overheat as it would have plenty of fresh coolant to keep it cool...

[4 Jaw Chuck]

Be afraid, very afraid.

[orangecrush]

Maybe you just misunderstood the guy. I here alot of ford guys talk about 309's and they are usually referring to a 60 over 302. Just a thought.

[BOBCRMAN@aol.com]

if you did understand the guy correctly, run don't walk away and never return, go to a competent machinest and have it done correctly, be aware that 302 ford motors are getting thin at .060" probably make more horsepower at .030 or .040", pistons must always be matched to the bore size.

[crshrmn3]

The machine shop I work with, requires that pistons be available when boring is to be done. They will not bore an engine block, at least not guarantee the work, without the pistons. Each piston is numbered 1-8 and each cylinder is bored to that piston. That way all tolerances are exact. They then went ahead and mounted each piston on the appropriate rod. Seemed to be a real professional working shop and price was reasonable.

[KULTULZ]

It would have to be an early 302 block or maybe Mexican to take it out that far. I have never heard of it. Too much material to remove for a thin casting. Even if sonic tested and done, it would still be very iffy.

Waste of time and money. 347 is the final solution.