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chevy 454 block question
03-31-2005, 07:38 AM
Post: #1
 
i found this 454 bare block locally.
i ran the number thru Mortec, they said...
14044807...454T..............4-bolt, Bowtie, MkIV, CNC prep, Tall deck, 4.25" bore or 4.495" bores

the dude says it has a bore of 4.535

the questions now
1)now im a$$uming its bored 40 over, is that ok on a big block, i know its a little much on a SBC.

2)is this a decent block to start a build up on for my K5?

3)and finally, how do you think these heads would work?
http://cgi.ebay.com/ebaymotors/ws/eBayIS...7965188097




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03-31-2005, 10:17 AM
Post: #2
 
Dont quote me on this but I thoght the crate 502 cid motors were just 454 that were bored and had a longer stroke. Anywho I hear a 454 is safe to bore up to .60 over.




Skoal, It does a body good!!!
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03-31-2005, 10:35 AM
Post: #3
 
One of my friends back home just got putting a 454 bored to 468 in a 53 willy's. It is bad-a$$. Forgot how much it is over in terms of .10's though Sorry




Chad<BR>03 Dodge Ram 3500 SRW, auto, SO motor, 4.10 gears, crew cab/shortbed, black.<BR>\"We Aint the Baddest-Bad Don\'t Mess With Us\"-Grave Digger
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03-31-2005, 10:37 AM
Post: #4
 
I have heard that tall decks are something to stay away from. If it is actually a tall deck i dont think i would mess with it. Maybe someone that knows about them will chime in here and help u out Very Happy




1978 chevy 3/4 long box, 350/205/465, 4.10\'s, d44/14ff detroit locker,35x12.50x15 Mud Kings,15X8 Cragar Black Windows, 6\" tuff country ez ride springs<BR>SOLD!!! lookin for new project
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03-31-2005, 04:41 PM
Post: #5
 
neighbor has a 454 .040 over on a stand right now, it could go .060 not a problem. Heard the same thing about the tall blocks also. are you running a carb or FI? just my humble $.02
josh
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03-31-2005, 04:51 PM
Post: #6
 
no im getting rid of the TBI and going carb.

whats so bad about a tall deck block?
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04-01-2005, 06:25 AM
Post: #7
 
You have found a truely rightous block there my friend. A CNC prepped bowtie block is a factory race prepped block. It comes from the facorty in two bores, 4.250" and 4.495". It is safe to bore these blocks to 4.630". So you are very safe on the bore. You have the making of a monster motor. But don't be fooled, the rortating a$$embly< crank, rods and pistons> to complete the build can cost as much as a completely built 454. A 502 is a 4.500" bore with a stock 4 inch stroke crank. Go to a 4.250 stroke and you got yourself a 540 cuin. If it were me I would go ahead and bore the block to 4.560". Drop in a 4.250 stroke crank and VIOLA!! You got a 555" firebreather!
This engine would be rock solid in mild form and potential would be unlimited. Leave in the stock stroke crank and bore to 4.560" and you got a 509". Also a bulit proof combo!
I will gladly help you make a beast out of this thing.
By the way, that block would cost you around $2000 from chevy's hiperformance center. If you don't want it, I'll take it.
Rob
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04-01-2005, 06:34 AM
Post: #8
 
One more thing. A tall deck bowtie block is what is needed to build a large inch stroker. The production tall blocks were only used in heavy trucks. They are ok as long as you don't get too crazy, but the bore size is limited for a street engine. The BOWTIE blocks are cast specifically for race use and the block is stronger in all areas. To use a tall deck you have to run longer rods. And a specific intake manifold. The heads are the same. Those heads are not going to feed nearly enough air into this engine. You will need larger intake ports and open chamber style heads, for many reasons. Like I said, If you decide to go with this get with me and I will get specific for you on what to look for.
Good luck-Rob
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