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4 bolt main conversion.

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Old Feb 25, 2018 | 10:23 AM
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Default 4 bolt main conversion.

Well my 2 bolt is now a 4 bolt main. Next stop line hone. That was a fun project and fairly easy but my caps were almost a perfect fit so that helped tremendously. Before
all holes were drilled to .8950
Made a dead center on the lathe to use for drill placement. After I was centered I locked the table down and zeroed the readout just in case something shifted and we drilled and tapped and then unlocked the table and on to the next.
Used a center on the Bridgeport to keep tap aligned. Every hole was centered, drilled and tapped with the table locked down to keep everything as perfect as possible.
I got lucky with these caps.
All done.
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Old Feb 25, 2018 | 10:58 AM
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From: Randolph nj
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looks good
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Old Feb 25, 2018 | 11:05 AM
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Originally Posted by forman
looks good
Thanks Forman.
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Old Feb 25, 2018 | 11:19 AM
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From: altered state
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brave guy, tried that once and screwed it up good
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Old Feb 25, 2018 | 11:27 AM
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Originally Posted by cuisinartvette
brave guy, tried that once and screwed it up good
Well I got lucky I guess😜
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Old Feb 25, 2018 | 11:31 AM
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From: Randolph nj
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i just want to see the manifold on that thing already , what kind of rotating assembly did you agree on
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Old Feb 25, 2018 | 11:39 AM
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Originally Posted by forman
i just want to see the manifold on that thing already , what kind of rotating assembly did you agree on
scat forged everything with h beam rods and 20cc dome pistons, I’m getting it from mike Lewis of wolfplace and having him balance the crank. Also getting my fully cnc’d 265 afr’s from him set up for solid roller from cstraub.
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Old Feb 25, 2018 | 11:41 AM
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Originally Posted by Muzzyzx7rr


scat forged everything with h beam rods and 20cc dome pistons, I’m getting it from mike Lewis of wolfplace and having him balance the crank. Also getting my fully cnc’d 265 afr’s from him set up for solid roller from cstraub.
yes Forman your manifold is going to look beautiful on here👍
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Old Feb 25, 2018 | 12:27 PM
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How did the rear seal from cap to block line up, Sometimes that can be a PIA..............
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Old Feb 25, 2018 | 12:33 PM
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Originally Posted by BROKEN RODS
How did the rear seal from cap to block line up, Sometimes that can be a PIA..............
you know I got extremely lucky with these caps, it was maybe .001 off . Again I couldn’t believe how snug these caps fit in the registers and how close all the bores lined up.

Last edited by Muzzyzx7rr; Feb 25, 2018 at 12:39 PM.
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Old Feb 25, 2018 | 12:56 PM
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Originally Posted by Muzzyzx7rr


you know I got extremely lucky with these caps, it was maybe .001 off . Again I couldn’t believe how snug these caps fit in the registers and how close all the bores lined up.
You are very lucky I seem to get all the horror shows to machine. Good job !!!!
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Old Feb 25, 2018 | 12:58 PM
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Originally Posted by BROKEN RODS
You are very lucky I seem to get all the horror shows to machine. Good job !!!!

thanks BROKEN RODS👍
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Old Feb 25, 2018 | 01:11 PM
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Nice job, well done. See it wasn't that hard, just a little time consuming.
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Old Feb 25, 2018 | 01:14 PM
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Originally Posted by Pop Chevy
Nice job, well done. See it wasn't that hard, just a little time consuming.
yes just not getting too confident and taking time with evey step. It was a fun little project. Thanks Pop Chevy! You know it was a few of your posts that kept me confident in doing this conversion. Thanks for your positive feedback in my previous thread👍. You guys are 😎

Last edited by Muzzyzx7rr; Feb 25, 2018 at 01:18 PM.
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Old Feb 25, 2018 | 07:03 PM
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Yer welcome. NOW , make sure you remove ALL the plugs in the block to get all the metal chips cleaned out. I even polish the insides to get all the casting flash , you won't believe the casting sand and crud trapped in the cavities. Ya can't get em too clean.
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Old Feb 25, 2018 | 07:07 PM
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So I'm guessing that wasn't originally a corvette block because I thought all corvette blocks were already 4 bolt mains?
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Old Feb 25, 2018 | 07:13 PM
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Originally Posted by Tommy K 47
So I'm guessing that wasn't originally a corvette block because I thought all corvette blocks were already 4 bolt mains?
Nothing about this engine will be original anyways, and I’m not sure if ALL blocks were 4 bolt for corvettes.
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Old Feb 25, 2018 | 07:14 PM
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Originally Posted by Pop Chevy
Yer welcome. NOW , make sure you remove ALL the plugs in the block to get all the metal chips cleaned out. I even polish the insides to get all the casting flash , you won't believe the casting sand and crud trapped in the cavities. Ya can't get em too clean.
ill make sure to do that, that’s crazy still sand in there from the factory?
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Old Feb 25, 2018 | 09:42 PM
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not all corvette blocks are 4 bolt mains.
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Old Feb 26, 2018 | 12:52 AM
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Originally Posted by Tommy K 47
So I'm guessing that wasn't originally a corvette block because I thought all corvette blocks were already 4 bolt mains?
The vast majority of all L48s (and the 327 blocks they derived from) were 2 bolt, even in Corvettes. You'll find the occasional 4 bolt L48 which was supposedly due to inventory problems in which case the line would use an L82 4 bolt block.
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