Anyone got experience with old Olds motors?

[wa2fastcamaro]

I just put a different 403 in my 79 Trans am, got it to run but needs tuning bad. I can do fuel injection but really suck at carbs. Anyone on here any good with them?

[weshole]

Rochesters are ez to tune. If I lived there, I'd definately help ya. I know, I'm not much help. Good luck man.

[z31]

Clean and rebuild the carb. :icon_bigsmurf:

[MisterCMK]

You should be able to find info on the Rochester carb as they are very plentiful and easy to tune. Whatever you do, don't buy a reman/rebuilt carb and give your original back as a core. When they rebuild the carbs the pieces are all taken out and mixed in with the rest of the carbs. When they put everything back it doesn't quite fit the same as the original parts did.

[wa2fastcamaro]

Its got a holley Reman carb on it, was just put on before I baught the car.

[z31]

Holley # and size?
If you have a wide band o2 sensor put it on the exhaust.

[wa2fastcamaro]

z31;229965 wrote:
Holley # and size?
If you have a wide band o2 sensor put it on the exhaust.

Its just a stock reman 750cfm carb.

What good would a o2 sensor do in the exhaust? Were talking about a carb'd car.

[wa2fastcamaro]

Heres more info on the car. My old motor and heads are eactly the same as the new ones I got.

The motor I baught was same year 79 Olds 403 with block# 557265 4B and Heads 4A 554717.

My old motor in the car that blew had the exact same casting numbers on the heads and block, so leads me to believe they are the exact same motor, so nothing should be changed.

I used the heads from my old motor as they were just rebuilt. Just a stock rebuild, as they had bad guides and seals.

My carb is a reman unit with 43100004 and 02273009 on the sticker on it.

Cam is stock grind for a 79 trans am and showed little to no wear when I put the motor together.

Other than that I have a MSD HEI distributor on it, Edlebrock Performenr Intake, Taylor 8mm Race wires, Stock AC plugs, dynomax coated long tube headers, dual 2.5" exhaust with flowmasters.

I set the timing at 18 degrees, it runs good, but if I advance it more the motor with smooth out even more. I have played with turning the distributor a bunch, runs rough at 0 degrees, runs diecent at 18 degrees and purrs at about 28 degrees. Thats with the advance unhooked also.

One other thing, which vacuum port should the vacuum advance be connected to on the carb? i forgot, and which one should the vacuum for the tranny be connected to on the carb?

I have all unnecessary stuff removed, no emissions, no egr. I wanted the motor to look as clean as possible