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-   -   Tuning a Pontiac 455 motor (http://www.thechicagogarage.com/forum/automotive-discussions/157948-tuning-pontiac-455-motor.html)

Cobra99 01-04-2017 11:03 AM

Tuning a Pontiac 455 motor
 
I have a friend with a 1981 Firebird that has a 455 in it. It's tuned so it runs but he thinks it really need to be dialed in. The car is in Northern Illinois and he doesn't know where to take it to get it really running great. Anyone know of a good garage he could bring it to?

daturbosix 01-04-2017 11:08 AM

what ignition and carb is on it?
are you sure its a 455 poncho? they didnt come in a 81.

Cobra99 01-04-2017 11:15 AM

It was originally a V6 but a motor swap was done. Engine came from a 1974 Pontiac.
Don't know the ignition but it has an Edelbrock 750CFM carb and he says it seems to have run better with a 650 CFM.

daturbosix 01-04-2017 11:25 AM

if its a stock emissions motor the 650 should have been enough.
tuning a edelbrock carb is stupid simple. there are only 2 adjustments that can be made easily and most of the time run the best right out of the box before people try fucking with them.

ignition timing and idle mixture and engine vacuum is the 3 things that will be monitored/changed while tuning this this.

boostedguy05 01-04-2017 11:29 AM

@Outlaw

cap42 01-04-2017 12:15 PM

750 is too much carb if it's a stock 455, if he still has the 650 throw that back on there and take it to a shop that can dial it all in. If he doesn't have the 650 anymore he might need to jet down the 750

Honestly it's pretty easy to dial in a carb'd motor, a vacumn gage, timing light and a few other cheap tools is all you need to get them running like a top.

daturbosix 01-04-2017 12:36 PM

Quote:

Originally Posted by cap42 (Post 3514410)
750 is too much carb if it's a stock 455, if he still has the 650 throw that back on there and take it to a shop that can dial it all in. If he doesn't have the 650 anymore he might need to jet down the 750

Honestly it's pretty easy to dial in a carb'd motor, a vacumn gage, timing light and a few other cheap tools is all you need to get them running like a top.

i hate these carbs. lol

http://www.youtube.com/watch?v=hoXK9tm0bWk

Turbocharged400sbc 01-04-2017 02:33 PM

Fuck the Carter/afb

Holley or quadrapuke fo lyfe foo.

ilikemtb999 01-04-2017 02:34 PM

I prefer quadrajunk

cobra_spence 01-04-2017 03:57 PM

Check out Paul Knippen Muscle Motors out in Sandwich. He specializes in Pontiac engines and is real easy to deal with. He has a FB page.

Mr. SBF 01-04-2017 04:05 PM

1 Attachment(s)
For best results with jetting carburetors the Fast Wideband is where it's at to find all of the Power available!

The Beast 01-04-2017 05:33 PM

Trailer it to OKC and drop it off with big chief at Midwest streetcars automotive he makes Pontiacs run 3ssss.

Ti28 01-04-2017 07:54 PM

Car needs a wide band installed and dyno'd. To get the screw on! The only real way to tune IMO.

daturbosix 01-05-2017 12:45 AM

Wide band o2's... cmon, we never used those years ago and our carb'd junk ran just fine..
Yall gotta be able to read a vacuum gauge and timing light


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