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Old 05-12-2010, 09:53 AM
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Is this 454 a "tall block"?

Just picked up a 454 from a 1991 GMC 3500 truck; it has fuel injection. Will this be considered a "tall" or "standard" block? Also, will a carburetor manifold fit this engine? I really don't want the complexity of a fuel injected engine.....it's going in my '67 Chevelle Malibu.
Thanks in advance!!

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Old 05-12-2010, 07:40 PM
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Should be a standard deck. And you can put a carb on it also.
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Old 05-12-2010, 08:04 PM
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Quick way to check. If the outer edge of upper bolt hole for the water pump is about 1/8" from deck surface. Short deck. If edge of bolt hole is just about 1/2" from deck. It is a tall deck.

3500 truck should be short deck. You should replace the heads (peanut port) for performance use.
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Old 05-14-2010, 05:57 AM
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Manifold/head replacement

Thanks guys! I'm hoping to pick up the engine this weekend. So I guess I can put any big block intake on it? Provided, the ports line up. I'm thinking of going with aftermarket heads; any suggestions? I'll be running a turbo 400, 3200 stall converter, 3.73 gears, in a full bodied '67 Chevelle. Intend on using it for street/bracket racing. Leaning towards aluminum big port heads to save some weight up front.
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Old 05-14-2010, 06:59 PM
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If its truly a 454, its not a tall deck. There were no factory 454 tall decks, only 366 and 427, and only in medium duty and up. Busses, dump trucks, step vans, etc. All the light duty trucks up to 1-ton got standard deck engines.
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Old 05-14-2010, 09:35 PM
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Quote:
Originally Posted by china-clipper
Thanks guys! I'm hoping to pick up the engine this weekend. So I guess I can put any big block intake on it? Provided, the ports line up. I'm thinking of going with aftermarket heads; any suggestions? I'll be running a turbo 400, 3200 stall converter, 3.73 gears, in a full bodied '67 Chevelle. Intend on using it for street/bracket racing. Leaning towards aluminum big port heads to save some weight up front.
This is a low compression 454 with a teeny weeny cam.The reason it makes decent low rpm torque for pulling power comes from them high velocity peanut ports over that displacement at low rpm,s.
Putting a tin big port head atop that combo would be a step backward even with the 75 lbs weight reduction.
A healthy 454 on the street usually has a 10/1 static cr..a camshaft with mid .500 lift,230ish* of duration @ .050" on a 110 lsa with oval port heads cleaned up.
Leave the rectangular ports on the shelf unless you have 500 cid or a 7k high winding 427.
The rovals that Eddy offers are a nice balance with the 110 cc chamber.Would raise your static cr and maintain good port velocity at lower rpm,s.Of course you will be changing the cam that compliments the heads and retains some semblance of effective cyl pressure.
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