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Old 06-01-2005, 23:39   #1 (permalink)
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.060" over bore size 351C

What do you guys think about boring 351's to .060" over size for a 300 hp engine? Square block.

Mate's got to either chuck a GT block OR get 8 sleeves OR bore to 4.060".

What are your opinions??
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Old 06-01-2005, 23:50   #2 (permalink)
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Re: .060" over bore size 351C

Quote:
Originally Posted by jock
What do you guys think about boring 351's to .060" over size for a 300 hp engine? Square block.

Mate's got to either chuck a GT block OR get 8 sleeves OR bore to 4.060".

What are your opinions??
is it a GT? if it is, sleeve it to save the original block. if it's not a GT, just get a fresh standard bore block. GT block or not, they're all the same!
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Old 06-01-2005, 23:59   #3 (permalink)
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Re: .060" over bore size 351C

I would save the GT block, polish it, and have it sitting in my shed. as far as a 060 block, no way. Cleveos are bad for blocks without a bore like that. 300hp aint much but it doesnt leave room for over heating and things llike that.
I would prepare another block and save the GT block to sleeve and use later when selling the car.
Would never use the GT block as is though, only sleeved.
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Old 06-02-2005, 00:14   #4 (permalink)
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Re: .060" over bore size 351C

Quote:
Originally Posted by pracy
I would save the GT block, polish it, and have it sitting in my shed. as far as a 060 block, no way. Cleveos are bad for blocks without a bore like that. 300hp aint much but it doesnt leave room for over heating and things llike that.
I would prepare another block and save the GT block to sleeve and use later when selling the car.
Would never use the GT block as is though, only sleeved.

Id rebuild the original motor as is (30 over) but freshen eveything up so it will run fine and store it. Then build another motor to use in the car.
Should you ever sell the car you've still got the original motor to put back in and it will run fine to sell and you've got your good motor to keep!
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Old 06-02-2005, 00:31   #5 (permalink)
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Re: .060" over bore size 351C

It's a GT and motor is too badly damaged to bore .030 or .040 and had to be .060 or use sleeves.
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Old 06-02-2005, 00:33   #6 (permalink)
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Re: .060" over bore size 351C

Quote:
Originally Posted by jock
It's a GT and motor is too badly damaged to bore .030 or .040 and had to be .060 or use sleeves.
What model GT?
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Old 06-02-2005, 01:25   #7 (permalink)
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Re: .060" over bore size 351C

Quote:
Originally Posted by jock
It's a GT and motor is too badly damaged to bore .030 or .040 and had to be .060 or use sleeves.
Get the block sonic tested. It may go to 60 thou easy, with no problems. Workhorse i think has a 60th over, with nitrous, and brenx is 40thou. But on the other side, i had a 60thou block many years ago, and it split more than 1 cylinder, in a mild 302c. Being a GT block, get it checked.
EDIT: i have heard sleeving all 8 cylinders can weaken the block, unless doing it the old style brazing.
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Old 06-02-2005, 02:27   #8 (permalink)
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Re: .060" over bore size 351C

300hp is basically stock. At 60thou it'll cope fine.
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Old 06-02-2005, 04:39   #9 (permalink)
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Re: .060" over bore size 351C

It's an XA.
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Old 06-02-2005, 06:26   #10 (permalink)
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Re: .060" over bore size 351C

Quote:
Originally Posted by xdclevo
Get the block sonic tested. It may go to 60 thou easy, with no problems. Workhorse i think has a 60th over, with nitrous, and brenx is 40thou. But on the other side, i had a 60thou block many years ago, and it split more than 1 cylinder, in a mild 302c. Being a GT block, get it checked.
EDIT: i have heard sleeving all 8 cylinders can weaken the block, unless doing it the old style brazing.
I agree with xdclevo, get the block sonic tested for wall thickness and go from there. It may be cast straight in which case it should be fine. It may need a sleeve on one or two cylinders to go .060 over on all of them. It may be so thin in places you will put it in the shed on an engine stand and tip-toe around it for fear of cracking a bore!

I found my motor was .060 over when I went to give it a freshen up. I have worked and raced it alot and had no problems.
I have broken a piston on nitrous and rebuilt again. I have just blown a piston for the second time, still no water in the oil!
My block is quite impressive but the driver is obviously a fool
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