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Old 02-23-2012, 01:15 PM   #1
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74 351w block

I found a 74 351w block bored .0040 over. I'm not sure if this is safe to use. I know it already has the roller cam swap done and I'd love to get it because its cheap. Any help?
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Old 02-23-2012, 01:21 PM   #2
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Quote:
Originally Posted by Redsteel
I found a 74 351w block bored .0040 over. I'm not sure if this is safe to use. I know it already has the roller cam swap done and I'd love to get it because its cheap. Any help?
I got a whole book on working with these babies. What's your concern?
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Old 02-23-2012, 02:36 PM   #3
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Is a 40 over bore too much to mess with?
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Old 02-23-2012, 03:01 PM   #4
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Originally Posted by Redsteel
Is a 40 over bore too much to mess with?
Are you wanting to counter at the bore? For example
You can have a standards bore 4.000 inch bore and overbore it by .030-inch to 4.030 inch, compression will increase by a fraction of a compression ratio point.
You can make a pretty nasty stroker with a 351 Windsor.
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Old 02-23-2012, 03:41 PM   #5
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Re: 74 351w block

or just throw a set of 40 over pistons in it ,think that makes it a 357 ci
and be on your way ...
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Old 02-23-2012, 04:11 PM   #6
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or just throw a set of 40 over pistons in it ,think that makes it a 357 ci
and be on your way ...
I think it's a 359ci with a 3.50 stroke
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Old 02-23-2012, 09:27 PM   #7
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Re: 74 351w block

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Is a 40 over bore too much to mess with?
.040 oversize bore is .010 past what the factory recommends for a stock 351W oversize bore.


However if the block experienced minimal or no core shift when it was cast then it should be ok.
Core shift can be "eyeball evaluated" by observing how well the freeze plug holes in the sides of the block are centered in the bosses cast for them. As long as they are pretty much centered, I wouldn't be overly concerned about the .040 over bore.


Just be sure the bore is square and the finish is correct as you don't have much room left for any corrective machine work.


P.S. I have tried up to a .060 bore in a SBF that exhibited no external evidence of core shift, but that left me with an engine that easily overheated due to the very thin cylinder walls and I doubt it could have withstood much abuse without disintegrating under the pressure. Driven granny style in an old Mercury Marquis, it did survive for just over another 150k miles though.
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Old 02-23-2012, 09:29 PM   #8
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Quote:
Originally Posted by Trojan Horse

.040 oversize bore is .010 past what the factory recommends for a stock 351W oversize bore.

However if the block experienced minimal or no core shift when it was cast then it should be ok.
Core shift can be "eyeball evaluated" by observing how well the freeze plug holes in the sides of the block are centered in the bosses cast for them. As long as they are pretty much centered, I wouldn't be overly concerned about the .040 over bore.

Just be sure the bore is square and the finish is correct as you don't have much room left for any corrective machine work.

P.S. I have tried up to a .060 bore in a SBF that exhibited no external evidence of core shift, but that left me with an engine that easily overheated due to the very thin cylinder walls and I doubt it could have withstood much abuse without disintegrating under the pressure. Driven granny style in an old Mercury Marquis, it did survive for just over another 150k miles though.
Well put my friend. ^ damn traveling Wikipedia here haha
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Old 02-23-2012, 10:01 PM   #9
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Re: 74 351w block

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Well put my friend. ^ damn traveling Wikipedia here haha
Thanks.
I read and surf the net voraciously, devouring any automotive information that interests me.
Luckily, I'm even able to retain some of it to share with my friends.
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Old 02-23-2012, 10:07 PM   #10
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Originally Posted by Trojan Horse

Thanks.
I read and surf the net voraciously, devouring any automotive information that interests me.
Luckily, I'm even able to retain some of it to share with my friends.
Haha I know I can see that. I feel like your Yoda.
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Old 02-23-2012, 10:23 PM   #11
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Re: 74 351w block

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Haha I know I can see that. I feel like your Yoda.
Hmmm, funny, that is.


I'm not quite that wrinkled or short though and I don't have large pointy ears.
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Old 02-23-2012, 10:26 PM   #12
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Originally Posted by Trojan Horse

Hmmm, funny, that is.

I'm not quite that wrinkled or short though and I don't have large pointy ears.
Hardy har har smartass! Literally haha. I think you would like the book I got. It's call " how to build big inch ford small blocks" but you prolly wouldn't need it by know the bore of that 351w off hand.
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Old 02-23-2012, 10:27 PM   #13
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i bet he has the book!
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Old 02-23-2012, 10:29 PM   #14
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i bet he has the book!
Shoot I would doubt it. I'm only 20 and its always by my chair and I still could tell you bore right off my head. Maybe stroke haha (big stroker guy) no homo
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Old 02-23-2012, 10:34 PM   #15
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i have no book and i do know my bore is 4.030 "and i think my stroke is 3". and dont say but i know its a small stroke.

---------- Post added at 10:34 PM ---------- Previous post was at 10:32 PM ----------

no seriously i purchased the book supertuning holleys that trojan recommended and it is very informative.that is my bathroom reading material.
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Old 02-23-2012, 10:48 PM   #16
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Re: 74 351w block

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i bet he has the book!
I actually think I may have a old version of it out in my garage.


At the moment I have 7 different Chilton's and Ford Performance books right here by my PC. Not sure exactly how many more in the garage, but there are several.
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Old 02-23-2012, 10:52 PM   #17
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i knew you liked to read so i figured u did.
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Old 02-24-2012, 10:17 AM   #18
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So if everythings good and straight in 2 weeks I should have the start of a nasty 351w to throw in Red Steel and Sex Appeal
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