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bore advice

 
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bigtizzles
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Joined: 17 Nov 2010
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PostPosted: Sun Dec 05, 2010 1:26 am    Post subject: bore advice Reply with quote

Its me again. I hope i'm not annoying anyone. I just figured out that my 68' 327 has already been bored out 030 over. It has 030 stamped in the piston top, after I cleaned them off i noticed it. The problem is the pecker head I got the motor from, left the heads off and it got rust in a couple of the cylinders. I think there is minor pitting from what I can see. I can only go 060 over max right? Is it true that the motor will run hotter at that big of a bore? What do you guys think about sleeving? Would that be expensive? I know you would have to see it to be sure, but do you think another 030 over would clean your average minor rust in a cylinder???
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robins44
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PostPosted: Sun Dec 05, 2010 1:28 am    Post subject: Reply with quote

i wouldnt worry about annoying anyone lol, topics are what keeps a forum alive.
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robins44
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PostPosted: Sun Dec 05, 2010 1:31 am    Post subject: Reply with quote

oh and to answer your question you should be alright at .060 over but you may want to consider sonic checking the block, and sleeving will not be worth the cost, at that point id get another block, maybe try a 350. If its just light rust you could just get away with a hone also.



Cody
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Sun Dec 05, 2010 1:32 am    Post subject: Reply with quote

you can only bore over what the cylinder walls will allow. a sonic test will tell you how much overbore the cylinders will take. if it were mine, i would try a ball hone first to see if the rust will clean up without boring. you still have to measure the cylinders to make sure they arent too big after honing but you may get lucky.
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It seems we can look at our magical Balls and come up with a fix?

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bigtizzles
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PostPosted: Sun Dec 05, 2010 5:20 am    Post subject: Reply with quote

Its been rusting for a while, i think he had it for about a year. it definitely has some pitting in the cylinders. Can't tell how bad it is. I rubbed it with some scotch brite and it seemed to clean up for the most part. I hope i can salvage this block, it is neat, and its my first motor. Do you think 30 thousanths will clean up your average rust?
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clay
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PostPosted: Sun Dec 05, 2010 11:56 am    Post subject: Reply with quote

Has the cylinder had water sitting in it or is just from condensation? From what you are describing it sounds minor and may clean up by going to 0.040" over. Doing this my save you some money also because my machinist hones only to go from 0.030" to 0.040" so you save the bore charge. Like robins44 said, that's why we're here, ask away. Clay
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bigtizzles
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PostPosted: Sun Dec 05, 2010 3:22 pm    Post subject: Reply with quote

it looks like water may have been sitting in one cylinder. It looks pretty crappy. I hope it cleans up.
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squeeezer
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PostPosted: Sun Dec 05, 2010 6:55 pm    Post subject: Reply with quote

where again are you located??
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bigtizzles
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PostPosted: Sun Dec 05, 2010 10:06 pm    Post subject: Reply with quote

new mexico
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Mr.T
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PostPosted: Wed Dec 29, 2010 9:50 am    Post subject: Reply with quote

Bore
Our present block had a badly pitted bore with many nicks. Lacking
funds we had to use it. First we used a very coarse hone for clean up and then fine honed it. The first inch looked ok but the rest was bad. Using a high quality moly ring it was put together
and fired up.That one side took 30min to start sealing but after 7 or 8 runs all was well.
After the race a compression test was given and all the cylinders were aprox. 145psi. Last season was our 3rd and our best time on a 3000lb Luv was 10.59 at 123mph. Moral-Its better to race it
with imperfections than look at a hangerqueen!
Mr.T
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jeep_406
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PostPosted: Wed Dec 29, 2010 1:54 pm    Post subject: Reply with quote

Have you had a machinist check over the block yet?
You mentioned in your first post about sleeving the block. I'd only do that if you had a ton of money & time in the block. Otherwise if you had a problem that required sleeving I'd go with another block.
If I remember correctly some of the guys putting serious horsepower to some Ford engines, 351 windsor I think, would sleeve them for strength.
Like Clay, my machinist hones .010
If you can get away with .040 that's how I'd go.
This is one of the best sites for information. Some guys are downright brilliant and SMOKE keeps it running well.
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Wed Dec 29, 2010 11:01 pm    Post subject: Reply with quote

bigtizzles wrote:
new mexico



reason i ask is i have many blocks/partial engines
but shipping would ruin any budget
but would be better than sleeving

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af2
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1933 Willys Coupe

PostPosted: Wed Dec 29, 2010 11:23 pm    Post subject: Reply with quote

Bore the worst hole to see where you are. Do the rest as the first.

Going .060 on a 327 is not going to bring up wife tails as people have mentioned.

If that was the case every 400 out there would be junk!!!!!!

Just my opinion after running many at .060
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bigtizzles
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PostPosted: Thu Dec 30, 2010 12:56 am    Post subject: Reply with quote

block and heads are at the shop right now. The old man says its worth a shot. He's gonna do the worst one first. Keeping my fingers crossed, i'm only attached to the block cause its my first build and I had such high hopes and dreams for it. If it doesn't clean up, i'm sure the local junkyards have some cool stuff. Thats where I got my Vortecs, heck they even had 2 sets of old camel humps laying around!
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