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Old 01-04-2017, 11:03 AM   #1
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Default 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?
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Old 01-04-2017, 11:08 AM   #2
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what ignition and carb is on it?
are you sure its a 455 poncho? they didnt come in a 81.
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Old 01-04-2017, 11:15 AM   #3
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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.
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Old 01-04-2017, 11:25 AM   #4
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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.
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Old 01-04-2017, 11:29 AM   #5
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Old 01-04-2017, 12:15 PM   #6
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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.
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Old 01-04-2017, 12:36 PM   #7
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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

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Old 01-04-2017, 02:33 PM   #8
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Old 01-04-2017, 02:34 PM   #9
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I prefer quadrajunk
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Old 01-04-2017, 03:57 PM   #10
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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.
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Old 01-04-2017, 04:05 PM   #11
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For best results with jetting carburetors the Fast Wideband is where it's at to find all of the Power available!
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Old 01-04-2017, 05:33 PM   #12
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Trailer it to OKC and drop it off with big chief at Midwest streetcars automotive he makes Pontiacs run 3ssss.
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Old 01-04-2017, 07:54 PM   #13
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Car needs a wide band installed and dyno'd. To get the screw on! The only real way to tune IMO.
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Old 01-05-2017, 12:45 AM   #14
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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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