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Old 03-18-2005, 06:25 PM
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454 ?

I found a great deal on a 454 4 bolt block, but it had a wristpin come out a put a groove in the cylinder wall the length of the stroke. How far can you over bore a 454 and is there such thing as a tall deck 454? Also if it cant be bored can it be sleeved, has anyone sleeved a block?

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Old 03-18-2005, 08:27 PM
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454

Yes their is a tall deck 454.
You can bore to at least .060
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Old 03-18-2005, 08:53 PM
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Just have the block sleeved. I have sleeved dozens of big blocks. A proper installation leaves you with a cylinder wall stronger than the block. The sleeve material is usually a better grade of iron.
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Old 03-18-2005, 09:12 PM
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depending on the use, you can bore a 454 to about .100 over, but you'll need at least a half fill on the block. for street, i wouldn't go over .060. as far as tall decks are concerned, gm never produced a 454 in the tall deck version. all the 454's were standard deck, or 9.8". the tall deck motors that were produced were truck motors, with a deck height of 10.2", and came in 366 ci and 427 ci. although the 427 had the same bore as the 454, it only came with the 3.76" stroke crank that the 366 had. the block was not factory clearanced for the 4.00" stroke crank that the 454 was, but can be made to fit with a bit of grinding. for performance use, you'd be better off with a 454. also, my experience with the tall deck truck motors is that they have thin cylinder walls to begin with. big overbores on them isn't a good idea. one other downside to them, is that they weigh more than standard deck blocks do. not a whole lot, but some. while they can be built up for performance use, i'd limit the overbore, keep a short stroke, and run a really long rod. i know someone will disagree with this, but i believe there are alot better blocks out there for racing/high performance use.
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Old 03-19-2005, 11:26 AM
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Quote:
Originally Posted by predator carb guru
......as far as tall decks are concerned, gm never produced a 454 in the tall deck version. all the 454's were standard deck....
This is incorrect. Chevrolet produced more than one tall deck 454. As an example, casting number 10134366 is a 454 4-bolt main Bowtie tall deck block as are casting numbers 14044807, 24502506. There are probably others as well that are of the 2 bolt main variety.

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Old 03-19-2005, 12:59 PM
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ok, got me on that one..............i was brain dead at the time of my last post. i didn't even think of the bowtie blocks. thanks for the correction. dang, i feel like an idiot now...................sheesh!!!
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Old 03-19-2005, 07:45 PM
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Thanks for the info guys especially clarifying the tall deck question. I've heard so many people say there wasnt a tall deck 454 and a few that say there is. I think I will purchase the block and have it bored and stroke to a 496, should be more than enough to a 502. Any good combos for a 496?
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Old 03-20-2005, 11:03 AM
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Quote:
Originally Posted by predator carb guru
ok, got me on that one..............i was brain dead at the time of my last post. i didn't even think of the bowtie blocks. thanks for the correction. dang, i feel like an idiot now...................sheesh!!!
Not to worry. With the myriad of parts available now days its hard to stay up to date.

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