Has anybody here sonic checked an LT1 block?
Has anybody here sonic checked an LT1 block?
05-13-2004, 05:03 PM
#4
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05-13-2004, 05:37 PM
#6
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did u look at this too???
http://shbox.com/1/engine_specs.jpg
http://shbox.com/1/engine_specs.jpg
05-13-2004, 08:37 PM
#7
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yes, but it doesn't show what I'm wanting to know.
again, I'm trying to find out how thick the cylinder walls are on a stock bore LT1. In order to find this out somebody would either have to sonic check the bores or cut the bores and measure.
I've got an LT1 block that I just picked up for cheap that I was considering cutting up, but if it can take a sleeve to fix it, then I'd rather use it.
again, I'm trying to find out how thick the cylinder walls are on a stock bore LT1. In order to find this out somebody would either have to sonic check the bores or cut the bores and measure.
I've got an LT1 block that I just picked up for cheap that I was considering cutting up, but if it can take a sleeve to fix it, then I'd rather use it.
05-13-2004, 08:39 PM
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That isn't shown on a spec chart..
05-14-2004, 06:24 AM
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Someone else's numbers won't do you much good. Production blocks are often fairly far off spec in terms of wall thickness. That's why people check them, to see if they have "core shift" and hence determine if a large overbore is feasible. Really sophisticated builders may do an "offset bore" where the bore centerline is offset away from the "thrust" side of the piston. This leaves a thicker wall on the thrust side, where the most stress is. In any case, for an NA application you want an absolute minimum wall thickness of ~0.140", more for a boosted application, at least 0.200" and as much as 0.240" for a really high-po setup. A partial block fill will help if the thickness is marginal. I wouldn't do an LT1 more than 0.030" over without having it checked. To be clear: you can't assume that YOUR block is suitable without actually checking it.
Rich Krause
Rich Krause
Last edited by rskrause; 05-14-2004 at 07:05 AM.
05-14-2004, 06:43 PM
#11
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Originally posted by rskrause
Someone else's numbers won't do you much good. Production blocks are often fairly far off spec in terms of wall thickness. That's why people check them, to see if they have "core shift" and hence determine if a large overbore is feasible. Really sophisticated builders may do an "offset bore" where the bore centerline is offset away from the "thrust" side of the piston. This leaves a thicker wall on the thrust side, where the most stress is. In any case, for an NA application you want an absolute minimum wall thickness of ~0.140", more for a boosted application, at least 0.200" and as much as 0.240" for a really high-po setup. A partial block fill will help if the thickness is marginal. I wouldn't do an LT1 more than 0.030" over without having it checked. To be clear: you can't assume that YOUR block is suitable without actually checking it.
Rich Krause
Someone else's numbers won't do you much good. Production blocks are often fairly far off spec in terms of wall thickness. That's why people check them, to see if they have "core shift" and hence determine if a large overbore is feasible. Really sophisticated builders may do an "offset bore" where the bore centerline is offset away from the "thrust" side of the piston. This leaves a thicker wall on the thrust side, where the most stress is. In any case, for an NA application you want an absolute minimum wall thickness of ~0.140", more for a boosted application, at least 0.200" and as much as 0.240" for a really high-po setup. A partial block fill will help if the thickness is marginal. I wouldn't do an LT1 more than 0.030" over without having it checked. To be clear: you can't assume that YOUR block is suitable without actually checking it.
Rich Krause
Although I agree with Rich, these aren't my numbers, I don't have sonic check equipment, they do however jive with my talks over the years with competent builders. Should be no different from standard SBC and the LTx motors.
-Mindgame
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