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Well going off of what CNC blocks is saying . Its probably better to be safe then sorry. But, if i go and buy another block with a std bore. Will i have to get it sonic test also at .030 over? Thanks for all the info.
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I would agree with CNC I had my 327 362 block sonic checked before I even
thaught of machine work. all blocks are different the biggest issue is casting
shift. cylinders walls can differ in thickness do to casting process some blocks
may only take the 30 overbore and some make take 60 overbore as long you
have it checked out and you have good thickness on the thrust of all of the
cylinders. I personally do not run my set up on the, track you can buy on those
fancy dart blocks to beat on I think there are plenty of standard bore 350
blocks out there for a decent price. make sure you buy top end enternal
parts for your build. I spent $6000.00 on top notch parts and machine work
it is rare block and plan on keeping it that way
Well going off of what CNC blocks is saying . Its probably better to be safe then sorry. But, if i go and buy another block with a std bore. Will i have to get it sonic test also at .030 over? Thanks for all the info.
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Mine is .030 and I beat on it hard. Can't get it to use any oil, just have to tow a gas station behind it. Put a little over 2500 miles on it since I built it a year ago.
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72 Nova -383, AFR 195s, Lunati #60113, 11.70s, next pass will be an 11.50
Last edited by sbc1320; 9th-December-2012 at 06:18 PM.
You can see the coreshift in my freezeplug boss' and front cam area. I only had to clearance one side of the block's cylinders for my stroker.
I have blocks that sonic tested great but core shift was way off, I have alot of blocks that show no coreshift that have failed a sonic test mostly one cylinder will make them fail.
Well going off of what CNC blocks is saying . Its probably better to be safe then sorry. But, if i go and buy another block with a std bore. Will i have to get it sonic test also at .030 over? Thanks for all the info.
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I have alot of blocks that are not good for .030 over that have no core shift. Its best to check.
I sonic test first before anything is done, for 40.00 dollars its good insurance.
Is anybody running a .060 block? I plan on going the aluminum head and roller cam and lifters route. Once i get my car together, I plan to drive it like I stole it. With that being said i want it to be reliable at the same time. Im not trying to throw money down the drain.
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I pretty much had the same build, my last motor was a 388, 340 block .060 over with 3.75 stroke. It ran great, and held up well. As far as hp numbers I do not know what they were. But the come was sportsman II heads ported by dr j . Lunati voodoo solid flat rapper cam(257/265@ .050 560/580 on 108). Had a plenum ported hurricane intake, flat top piston etc. Well cam broke in 3 places. Motor was destroyed. I would do it all over again with better parts to make a long story short. So you should be fine
350 cylinder walls are plenty thick to handle .060 over
Quote:
I have alot of blocks that are not good for .030 over that have no core shift
I have a real mild .060" over 350 that runs well, but also runs hotter than my 600 h.p. 400.
I had a .030" over 350 block that looked great as far as core shift went, but it had a spot in one cylinder that was about .035" thick, and poured water into that cylinder; at first glance it looked OK, but a little stained area in the bore was thin enough to stick a screwdriver through! We sleeved that hole because it was a low buck build with a Chinese crank and KB hyper pistons, but it still ran 10.20's at 131 in a 71 Nova.
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69 Nova 410" small block-Driven to track
6.39 E.T./105 MPH--6.11/112.89 w/N2O bowtie0069.fotki.com/
A 350 bored .060 will run hot, A friend of mine bought a P.A.W. kit we assembled and it came with a .060 over block. Even with a 4 core radiator we had trouble keeping it cool in his 69 Nova but it ran good! 350 4 bolts are easy to find, I would do a .030 and that way you've got room for a .040 freshen up down the road.
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