to bore......or not to bore? - Team Camaro Tech
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post #1 of 11 (permalink) Old Oct 7th, 03, 05:42 PM Thread Starter
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Question

i have a dz block that has the bore size 4.005 on one cylinder,which is the biggest out of the 8 cylinders.can i just hone the block and use standard rings and pistons or do i need to bore it and use oversize pistons?

[ 10-08-2003, 06:36 PM: Message edited by: 69z28rsbilly ]

69 rs/z28 <br />711 72 72<br />12c x33
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post #2 of 11 (permalink) Old Oct 7th, 03, 06:51 PM
 
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Heck, I swear my junk 301 had like .010" over on the old worn out 327 block that I used to make it out of!! I swear I pushed a .020" feeler gage down one side on her after I retired her!!!

But it mighta just seemed like it??

Sure the old cheap $39 W/JCW, 1/8" over with 1/8" half round domes cast pistons rattled and it did use alotta oil but it never missed a beat until either the plugs loaded up with oil or I was above the old point distributor's operating rpm range!!!

IMHO, I wouldn't give her a thought about throwing a ball hone shade-tree overhaul on her and then justa keep on stomping on her!!!

But you MAY want to file fit the rings???

pdq67



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post #3 of 11 (permalink) Old Oct 8th, 03, 10:39 AM
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Eric
 
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Nothing wrong with doing what PDQ suggests, but IMO if you have the money to do it up, just take the block to the machine shop and have them measure it out.

It should be a straight up quick answer from the machine shop - they cam measure the bore at its biggest point, taper, etc and tell you for sure. If they say the bores are true then maybe a coated piston would fit tight enough, but I bet once you have honed it out correctly the bores will be too big.

+.030" pistons are readily available, then you could probably get +.040 and +.060 . . . if the first built has lasted 35 years you still have another 2 rebuilds and 70 years worth of use left

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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle
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post #4 of 11 (permalink) Old Oct 8th, 03, 04:34 PM Thread Starter
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Question

thanks for the replies so far.
anyone else have a say so?

69 rs/z28 <br />711 72 72<br />12c x33
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post #5 of 11 (permalink) Old Oct 8th, 03, 08:45 PM
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I have thrown low $$$ engines together in the past that had ton's of bore wear and lived to tell about it, but never in anything with the rpm capability of a DZ. They all consumed a little oil and had some piston slap, but for a kid with no money I didn't have any options. What is more of a problem than just the bore size is the actual shape of the cylinder...chances are they are tapered and maybe even a little barrel shaped. Have a reputable machine shop check the bores for you and see what your options are.

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post #6 of 11 (permalink) Old Oct 9th, 03, 06:20 PM
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I am in somewhat the same position as billy. I have a standard bore DZ engine that is going back standard. But what about the deck? I know that I can't have it decked without losing the numbers, but what is the downside? A head gasket that may not seal?
Gary

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post #7 of 11 (permalink) Old Oct 9th, 03, 08:01 PM
 
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Here I go again!!!

I've mouthed off about my old junk 301 so much that everybody is probably getting sick of hearing about it but I'm here to tell you straight out the sucker flat got up amoungst them upstairs and just like the Energizer Bunny, kept right on a going and a going!!!

Sure I had trouble keeping a balancer on it at rpm'd b/c it wasn't balanced, but what the hey, I figure I had all of $150/175? in the junk parts sucker!!!

I retired her b/c I ate a stock rocker, bent a p/r and throwed a lifter and knowing now what I know, I shoulda put a new lifter, a junk rocker and used p/r in her and still kept beating on her instead of dropping the .060" over 409 "W" motor in her!!

Go ahead and spend your money AND I will bet a 6-pack of your favorite "barley-pop" that you won't beat on your original rebuilt Z- motor as bad as I beat on my junk 301 even with all the money you put into it!!!

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post #8 of 11 (permalink) Old Oct 10th, 03, 03:53 AM
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You can hone the glaze out, maybe knurl the skirts, throw on some new rings and bearings, quicky valve job, slap it back together, and it will run for a little while longer. It will not last long and you will be tearing it down again soon.

OR... You can bore it .030 over and build a "good as new" or better engine that will last you a VERY long time with proper maintenence.

If the deck is in good shape and clean, you do not need to have it surfaced. Many engines over many years have been done that way.

-Mark.
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post #9 of 11 (permalink) Old Oct 10th, 03, 08:43 AM
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"knurl" thats such a weird word, isn't it?

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post #10 of 11 (permalink) Old Oct 10th, 03, 12:01 PM
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Quote:
Originally posted by rolling-robert:
"knurl" thats such a weird word, isn't it?
not as weird as "waddinxveen" LOL (looking at your location)

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68 Camaro, E85 powered 427" small block. 9.96 @ 133 MPH, 1.319 sixty foot on motor. 5.92 eighth @ 116 with a 1.42 sixty breaking beams with back tire on the bottle
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post #11 of 11 (permalink) Old Oct 10th, 03, 12:48 PM
 
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I guess my idea of lasting a long time is different than others idea of it b/c if my motor isn't knocking, starts OK and run's without missing, even if it uses and leaks a little/lot of oil, I figure that it is lasting and will continue to last a whole lot longer!!!

I don't care if my oil pressure goes from 3 pounds to 40 pounds as long as it has oil pressure too..

I AM just darn sure to check it's oil every time I fill up if it is using/leaking that much b/c IF I don't, I darn sure will blow her up by dropping a rod at speed b/c of lack of oil!!!

And to me the price would be right, too...



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