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Old 05-24-2006, 11:04 AM
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403 olds in trans am

can a 403 olds in a trans am be made to have horsepower

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Old 05-24-2006, 11:07 AM
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Most definitely! There is plenty of aftermarket support for the low deck Rocket engines. IIRC the forged crank from a mid-60's 330 CID is a drop in and there are still plenty of those floating around.
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Old 05-24-2006, 11:45 AM
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Yup, forged crank, and I would say anything past about 400-450 hp I'd think about better rods, and anything past 500 hp I'd do a main girdle. The main webs are windowed on those engines and at higher RPMs/cylinder pressures they like to walk around a bit
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Old 05-25-2006, 01:21 PM
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look at these and, do a search on here for Olds 403


403 motor




olds 403?
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Old 05-28-2006, 12:47 PM
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http://en.wikipedia.org/wiki/Oldsmobile_V8_engine

The Olds 403 is related to the other "small-block" 64-up Olds V8 engines: 260, 307, 330, and 350. They all share a common 3.385 stroke. 403 has a standard deck and a huge bore, cylinders are siamesed together so make sure you've got good flow in your cooling system and radiator. Biggest bore of any small block ever!

400, 425, and 455 are considered "big-blocks"

I don't see any reason why you couldn't add a Caddy Seville PFI to it if you wanted fuel injection, just pick slightly larger injectors.
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Old 05-28-2006, 03:32 PM
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Hi!

We build a 403 for an customer at the Moment.

I take the New KB-Pistons for it, with a Edelbrock Intake and some other.

I will tell you how it goes..
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Old 05-28-2006, 03:33 PM
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2 weeks ago there was a long thread about the 403.

Biggest problem is getting compression over 8.0. Needs 350 heads. Compression is more important than big valves and humongous ports.

Can make real 375 hp easily at reasonable money. Beyond that gets expensive.
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Old 05-28-2006, 05:19 PM
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One of the tricks the stock class drag race Olds guys use is a TON of ignition advance to get more use of cylinder pressures..It's really a treat to see street driven Vista-Cruiser wagons carry the front wheels leaving the line.
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Old 05-28-2006, 07:06 PM
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since we are on the Olds subject, i have been told that a 455 will bolt right in place of a 307, is this true?
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Old 05-28-2006, 07:14 PM
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Quote:
Originally Posted by DougGass87
since we are on the Olds subject, i have been told that a 455 will bolt right in place of a 307, is this true?
Define "bolt right in place".

It should bolt to the tranny and mounts shouldn't be a problem, but whether it fits the engine compartment, clears steering shaft/linkages, firewall, etc. is another story. Get one complete with brackets as they can be different.
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Old 05-28-2006, 07:22 PM
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the guy i bought my 84 buick lesabre from told me he knew a guy that had a lesabre and bolted a 455 right into it with no problems.....but this dude also liked to make up "stories" so i dunno if he was telling the truth or not
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Old 05-28-2006, 07:28 PM
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LeSabre should have room and depending on the year may have had a 455 as an option. Still will probably be things that won't "bolt right up" without the proper 455 part.
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Old 05-28-2006, 07:31 PM
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i dont plan to do it, actually the lesabre is going to the crusher soon as i pull the parts i want off/out of it....

the 307/2004r is going in my 56 chevy pickup for the time being, was just wondering if i were to ever run across a 455 for a bargain if it would bolt into the 56 useing the mounts i will be fabbing to install the 307....
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Old 05-28-2006, 07:45 PM
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Quote:
Originally Posted by DougGass87
i dont plan to do it, actually the lesabre is going to the crusher soon as i pull the parts i want off/out of it....

the 307/2004r is going in my 56 chevy pickup for the time being, was just wondering if i were to ever run across a 455 for a bargain if it would bolt into the 56 useing the mounts i will be fabbing to install the 307....
Short answer, probably.

I have a friend who has a 455 Pontiac in an early 60s Dodge pickup.
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