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Old 04-30-2005, 08:03 AM
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orphan Cad

Wow,just scored a complete 1991 low mileage 4.9 ETC Caddy motor.I'm all stoked to build sumpin. All Aluminum 300 hp in a 425 lb package. Way cool. What to do. Maybe a single seat lakester? UHOH, gotta shift it. What am I going to use for a TRANSMISSION? Suppose there might be a 4 OR 5 SPD that will bolt up? Hey i know where there's a two spd axle .............

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Old 05-01-2005, 08:32 PM
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I know nothing about those engines, but the power to weight ratio gets my attention. Imagine the possibilities.
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Old 05-01-2005, 09:51 PM
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300HP from a 4.9? Sounds about 125HP too high to me. I'm no Caddy expert but perhaps you are thinking of the 4.6 Northstar engines? They are NOT the same as the 4.1/4.5/4.9 series of engines and have nothing in common with them. In the 90's different model Caddies could have either engine, the Northstars were an option. There were also low performance and high performance Northstars. The VIN of the car will denote which is which, hard to tell otherwise. The hi-po Northstar was indeed good for about 300HP. Not so the other engines.
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Old 05-02-2005, 05:39 PM
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From what I have seen and heard the 4.1 & 4.9 modular engines are not reliable enough to become much more than the stock engines they attepmted to be in the first place.

There were too many reliability issues once something went wrong, and it usually started with overheating, then individual cylinder sealing.

Building and rebuilding these can be a PITA from what I gather from the books I have. I have seen NO aftermerket hard parts, and no one specializing in them.
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Old 05-07-2005, 02:45 AM
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If that is a variation of the 4.1 or 4100 I would drop it like a hot potatoe. Not worth the trouble.
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Old 05-10-2005, 08:21 AM
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Quote:
Originally Posted by willowbilly3
If that is a variation of the 4.1 or 4100 I would drop it like a hot potatoe. Not worth the trouble.
Actually, the Caddy 4.9L V8 IS a variation of the 4.1\4.5L. It's a larger bore and stroke version that GM finally got right. But, it's no barn burner. It's got an aluminum block and intake with cast iron heads. Nobody makes performance parts for it that I know of. Fiero guys like them because they are an easy swap. Isuzu 4x4 guys are catching onto them as well because they put out a lot of torque and are fairly cheap. Otherwise, they are nothing to get excited about.

Greg
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