MTI Iron Block 427 CI, is it really possible???
09-19-2005, 07:57 AM
#1
MTI Iron Block 427 CI, is it really possible??? I found this on Ebay.
http://cgi.ebay.com/ebaymotors/MTI-B...spagenameZWDVW
Is it safe to have a 4.080 Bore and 4.080 Stroke?
http://cgi.ebay.com/ebaymotors/MTI-B...spagenameZWDVW
Is it safe to have a 4.080 Bore and 4.080 Stroke?
09-19-2005, 08:17 AM
#2
Those bores are not even close to touching each other from what I can tell, so it should be safe as far as the bore. Now whether or not it's a 427 or not? I'd talk to MTI. I think something is fishy, I've never heard of a 427 without sleeves. Typical is 402-408
09-19-2005, 08:41 AM
#3
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i know the MTI iron block 427's were a different bore/stroke combo. it's a .060 over bore and a 4.125" stroke crank............... do the math. the 4.08 bore and 4.08 stroke don't even make 427 inches. it makes 423............. i have never even seen an ls-1 crank with that stroke.
to answer your question "is it possible?" YES. it is very possible. LOTS-O-TORQUE.
to answer your question "is it possible?" YES. it is very possible. LOTS-O-TORQUE.
09-19-2005, 11:58 AM
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It sounds off to me. I have a 4.06 bore with a 4.075 stroke and it is a really uncommon setup. The crank is a lunati 4" that I had offset ground to a 2" journal and got 4.075 stroke. I have only heard about a couple people doing a 4.080 bore, but it is a bad idea. The cylinder walls are too thin. Mostly sand rail racers that were all engine back a couple years ago. Something sounds fishy to me. That would give you a 426.7 displacement. MTI's iron block 427 was a 4.125 stroke with a 4.06 bore.
09-19-2005, 12:50 PM
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Originally Posted by 777
That doesn't look like it's even been bored out. The cylinder walls are still fairly thick. From what I can tell at least.
How can you tell how much a block os bored from only a pic? Trending Topics
09-19-2005, 04:45 PM
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Crank doesn't look like my lunati either. Neither of those pictures has been bored. Those are alluminum blocks. I would say the top one had a .005 hone done though.
09-19-2005, 05:24 PM
#14
Originally Posted by strokedls1
Neither of those pictures has been bored. Those are alluminum blocks.
09-19-2005, 06:10 PM
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Originally Posted by Beast96Z
Your kidding right? Look at the pictures again and look in between the cylinders. The top block has been dry sleeved and the sleeves touch. The bottom block is stock and has ample amounts of aluminum between the cylinders. The motor in questions seems kinda leary. The only way to get that stroke is to offset grind, and there is no way I would do a 4.080 bore on a iron block.
I was doing something else and didn't look close.
09-19-2005, 06:47 PM
#17
Originally Posted by Billiumss
I'm with you guys, doesn't "look" like a 427.
I always heard that you don't want to go over 4.060 cuz then you won't have a safe service bore for a rebuild
I always heard that you don't want to go over 4.060 cuz then you won't have a safe service bore for a rebuild
09-19-2005, 09:48 PM
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6.0 blocks sonic test out in between the cylinders at .09 thick at 4.00 bore. Sonic tested two different blocks and got the same result. The real secret that knowbody talks about is the 5.3 block. I have seen this block sonic test out to be bore to four inch (3.780). Do not go more than 4.00. It is not as thick at the top of the cylinders and bottom as the 6.0 (.300 +) but it is still .150 in the thin areas at the top and bottom. I think this would be enough when you compare an alum. block that has been resleeved with thin type sleeves such as the way people are doing the new LS2. Just a little info for the bugdet guy.
09-20-2005, 05:53 PM
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FYI: this is the real deal
https://ls1tech.com/forums/sponsor-sales-specials/383261-427-iron-block-only-best-components-ready-ship.html
https://ls1tech.com/forums/sponsor-sales-specials/383261-427-iron-block-only-best-components-ready-ship.html