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Old 07-22-2008, 09:15 AM   #1 (permalink)
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bore size 302

i measured the bore size of my '84 5.0 and it is 4.039 Inch,

I thought a 5.0 is 4.00 inch.. overmate? mbe other crank 2?
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Old 07-23-2008, 09:12 AM   #2 (permalink)
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Re: bore size 302

Std. bore is 4.00. Yours measures like it has been over bored .030
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Old 07-23-2008, 09:16 AM   #3 (permalink)
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Re: bore size 302

Your's has been bored .040 over sir.

It's practically junk as far as going bigger is conserned...
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Old 07-26-2008, 07:21 PM   #4 (permalink)
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Re: bore size 302

check this bore size out
TMeyer Projects - 302 Overbore
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Old 07-26-2008, 10:25 PM   #5 (permalink)
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Re: bore size 302

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Originally Posted by steharz View Post
check this bore size out
TMeyer Projects - 302 Overbore
...And people give me a hard time for boring my 351W .060 over!
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Old 07-27-2008, 08:52 AM   #6 (permalink)
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Re: bore size 302

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...And people give me a hard time for boring my 351W .060 over!
my 351w is .040 over and still sonic .125. so when I need to, I'll be going .060
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Old 07-27-2008, 11:37 AM   #7 (permalink)
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Re: bore size 302

wow... .125 over bore.. geese..

Yes, people would frown when i told them my 302 was bored .060 over..
Never had a problem..

I would like to see a .120 over 302 motor run. Wonder what pistons you could use.
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Old 07-27-2008, 11:43 AM   #8 (permalink)
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Re: bore size 302

WOW!, 60 and 120 over???? Holy crud, I never seen it till now...

Well, I've seen 60 in a few but not many...
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Old 07-27-2008, 12:15 PM   #9 (permalink)
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Re: bore size 302

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WOW!, 60 and 120 over???? Holy crud, I never seen it till now...

Well, I've seen 60 in a few but not many...
I'm apparantly really living on the edge! I have a 4.10 stroke crank to go along with my 4.060 bore to make 424 cubic inches (some round it off to 425). Between the rod ratio and the "thin cylinder walls" some people think it will not last. So far, so good... I guess time will tell!
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Old 08-10-2008, 12:51 AM   #10 (permalink)
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Re: bore size 302

I would never run a .104 wall. Sure, it would run, but you'd never get the power you would otherwise have due to cylinder distortion. On a high PCP (Peak Cylinder Pressure) engine, like high compression N/A race engines, nitrous or boosted stuff, the thrust side would also crack or split in short order. You might support it with a full block fill if you didn't need a cooling system. Not the thing to do for 18 cubic inches.
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Old 08-10-2008, 01:03 AM   #11 (permalink)
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Re: bore size 302

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Originally Posted by kgordonl View Post
I'm apparantly really living on the edge! I have a 4.10 stroke crank to go along with my 4.060 bore to make 424 cubic inches (some round it off to 425). Between the rod ratio and the "thin cylinder walls" some people think it will not last. So far, so good... I guess time will tell!
Have your block sonic tested We did that when I built my 417 , I found one block that had more meat after boring .060" than the other blocks we tested standard bore . We found some blocks have tar able core shift . We tested 6 blocks one passed .060 bore 3 failed .030 bore and two were safe at .030.

Last edited by MY TWO STANGS; 08-10-2008 at 11:32 AM.
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Old 08-10-2008, 03:08 PM   #12 (permalink)
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Re: bore size 302

i got a .175 over bore W block, with a lot of wall left-- OK; its a CUP block
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Old 08-24-2008, 12:07 AM   #13 (permalink)
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Re: bore size 302

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Originally Posted by FEandGoingBroke View Post

It's practically junk as far as going bigger is conserned...
junk? the grooves on the sidewall of the cilinders are still there, and in the cilinders you can see the hone marks.

the cilinderwalls are thin, but not like lot of european cars.. are there anny steel head gaskets on the market? i bet they can handle it, even blown.
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Old 08-24-2008, 04:05 AM   #14 (permalink)
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Re: bore size 302

.040 over is pretty common place. I've done several .060 without any problems. They were street cars, and it's hot here in Florida. Never a problem.

I do prefer to stay at .030 and .040, just incase I run into a "thin wall" block.
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Old 08-29-2008, 12:27 AM   #15 (permalink)
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Re: bore size 302

Ok, i think i understand the problem. First i thought it was a problem for the cilinder head gaskets. Do the cilinder wall burst into the waterchannel? someone got a pic?

i am planning to blow it.. is there some experience with a .40 over?
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