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Old 09-13-2007, 10:13 PM
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small block 454

How can i build me a chevy small block 454. Do i have to have a small block 400 to do it or does it take a block special made for one

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Old 09-13-2007, 10:27 PM
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here you go my friend

http://theengineshop.com/prods_pages/101011.htm

http://theengineshop.com/prods_pages...3_techspcs.htm
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Old 09-13-2007, 11:02 PM
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The World Products Motown block can go out to 4.200" which is what you're gonna need to get there. An aluminum Brodix block would probably do it too but you're probably looking at $4000+ just for the block itself.

An aftermarket block like the Motown could potentially be the last block you'd ever have to buy, if you didn't take it out to its max bore right off the bat. Start with a 4.125 bore and 4.100 stroke and you'll get a 438, each subsequent overbore will get you slightly closer and you'll have years upon years of life in that block.
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Old 09-13-2007, 11:36 PM
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i read the specs on the motown block it says it has a max bore of 4.200 with a 4.0 stroke= 443 ci

but the 454 has a 4.250 bore x 4.0 stroke 453.96. i know i'm splitting hairs but anyways, as much as that block costs 2k. i would just go with a stock 4" bore and a 4" stroke=402 ci then go from there.
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Old 09-14-2007, 12:33 AM
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Use a Dart block with the raised cam tunnel and spread pan rails and stick in a 4.125 crank. Get your wallet out as I run a 454 small block and it isn't a cheap build.
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Old 09-14-2007, 03:00 PM
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This is actually something I've been thinking about recently: Is it really worth building a small-block 454? Or any size small-block in that range? It was my understanding that SBCs are already under-valved, and I seem to remember reading somewhere that the largest intake valve that you can machine into a set of SBC heads is about 2.100" or something. With the limited valve size, it just seems to me that the larger you went with the small-block, you'll see diminishing returns as the engine is more and more starved for air. An aggressive cam and valve train might help make up for this, but all things considered, wouldn't a 454 BBC outperform a 454 SBC given similar parts?

I know next to nothing about BBCs, so I'd like to learn more.
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Old 09-14-2007, 03:39 PM
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Valve sizes larger than 2.1 fit many heads that are appropriate for a 454 small block. Nobody I know that runs these big small blocks run a traditional 23 degree head. All are running 12 to 21 degree raised runner heads. There is no shortage of airflow with the correct cylinder head.

It's impossible to compare the big block versus small block as there really is no apples to apples way to do it. Can you build some type of big block to perform better than some type of big small block, of course. Of course in NMCA Chris U sure spanked a ton of big blocks over the years with his N/A 454 Dart small block. If I were to do a big buck engine again I'd be going aluminum big block.
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Old 09-15-2007, 12:19 AM
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Regarding the comparison between the SB and BB 454, I was thinking strictly in terms of the ratio of valve size to displacement - basically, given the same displacement, the engine with the ability to get more air past the valve will come out on top. But you're right, my thinking was restricted to 23 degree SBC heads. Thanks for the clarification.
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