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Old 09-03-2008, 12:25 AM
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403 rocket

Hey guys i got a 77 delta 88 with a 403 "small block" in it. I say its a Rocket because the car is all original and the valve covers say rocket across them. I'm not really sure what the difference is between the rocket block and the regular olds block. The motor prolly has over 200,000 miles on it now. I do plan on some day rebuilding the motor.

My question is, Could this Block be a canidate for any kind of high performance application? It has a HUGE bore and a pretty tight stroke standard. I think they were rated at 185hp from the factory.

Could i even find performance parts for it, like forged piston, crank, rods, big cam, aftermarket heads? does anyone make this stuff?

I'f i build it right what would be the most power this block could handle. do any of you have one that you've built, how did it turn out?

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Old 09-03-2008, 12:47 AM
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Just google "Olds performance parts" lots of web sites.

www.realoldspower.com www.442.com
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Old 09-03-2008, 02:13 AM
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4,000 and a motor
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Old 09-03-2008, 03:30 AM
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AFAK all rocket V8s are called īrocketsī because of the Oldsmobile Logo.

I donīt know how much power my 403 makes but it runs very strong and is a lot of fun in my 91 Caprice
(TH350, 3000rpm converter, 3.42:1 rearend with Eaton posi)

Stock crankshaft has revised oil bores,
Rods are stock, weight reduced
Pistons are TRW/Federal Mogul, compression ratio 11.70:1 (sorry, no part#)
Lunati 224/234 flat tappet camshaft (#00083)
Harland-Sharp 1.6 rockers
Ported Edelbrock performer rpm heads and intake #7111
QuickFuel 750cfm carb
Hooker Long tube headers #3901. 1 5/8" primaries and and 2,5" exhaust

Didnīt built it myself.

Last edited by knaagi; 09-03-2008 at 04:00 AM.
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Old 09-03-2008, 06:42 PM
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Quote:
Originally Posted by eatonde
Hey guys i got a 77 delta 88 with a 403 "small block" in it. I say its a Rocket because the car is all original and the valve covers say rocket across them. I'm not really sure what the difference is between the rocket block and the regular olds block. The motor prolly has over 200,000 miles on it now. I do plan on some day rebuilding the motor.

My question is, Could this Block be a canidate for any kind of high performance application? It has a HUGE bore and a pretty tight stroke standard. I think they were rated at 185hp from the factory.

Could i even find performance parts for it, like forged piston, crank, rods, big cam, aftermarket heads? does anyone make this stuff?

I'f i build it right what would be the most power this block could handle. do any of you have one that you've built, how did it turn out?
First, ALL Olds motors were called "rocket" (except for the aluminum 215 built in 1961-1963, which was called the "rockette" - I am not making that up). The term was a marketing term coined with the first Olds V8 in 1949 and means nothing as far as performance is concerned.

Note (to confuse things) that in the 1980s there was a "Rocket Block" sold by GM performance parts. This was actually a small block Chevy block sold by Olds (and with an Olds part number and logo cast in the side) that was intended for use in racing classes where "corporate" engine swaps were allowed. It was never offered as a production option.

You are correct, the 403 is considered a small block Olds. The Olds small and big blocks differ externally by the deck height. Most other key dimensions and parts are the same (though the bearing diameters on the crank are different). The 403 has a humongous bore and should have a lot of performance potential, however in the late 1970s weight savings the block has large "windows" in the main webs. This limits ultimate performance, but shouldn't cause a problem for most street builds.
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Old 09-03-2008, 09:15 PM
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power

So knaggi, how much HP would you rate your 403 set up at. Do you have any 1/8 or 1/4 mile ET's or MPH #'s for the car with that set up?
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Old 09-03-2008, 11:37 PM
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Quote:
Originally Posted by eatonde
So knaggi, how much HP would you rate your 403 set up at. Do you have any 1/8 or 1/4 mile ET's or MPH #'s for the car with that set up?
No representative numbers so far, because iīm a newbie to racing.
The rearend conversion from 2.56 to 3.42 was done just a few weeks ago and i raced it on the 1/4 mile two times since then.
The second run was the better one but still 15.21 seconds @ 87.98 mph
Messed up the launch on both runs and still have 235s.
I think with a little training and wider tires i could get into 13s.
I would rate the engine to 400 HP, maybe more.

Last edited by knaagi; 09-04-2008 at 02:00 AM.
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Old 09-03-2008, 11:45 PM
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403 rocket

Nice.... I dunno if you'll pick up a full 2 seconds but it should definitely improve.
Just for my own curiousity what kind of rmp range are you seeing. What RPM do you shift at for the 1/2 shift?
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Old 09-04-2008, 09:57 AM
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The 2/3 shift is at 5000rpm.
Donīt know for the 1/2 shift but i will watch that tach next time i drive it hard
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