455 torque convertor? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1000000to1 · 01-02-2014, 02:59 PM

I have a 455 bored .30 over with a 453/456 valve lift cam, air gap intake, slightly ported g heads with an 870 streetavenger. Block has been decked and line bored etc. I'm putting a th350 behind it with a shift kit and just wondering what stall I should run? The cam is 1000-5200 rpm. I ordered a 1800-2200 convertor because everyone always says to stay close to bottom of powerband but I talked to another company that figured I should run a 3200. Now I'm not sure. I'm putting it into a 58 gmc with a 3:90 rearend and am just using it as a Sunday driver and to melt some rubber when I feel the need. Thanks for your help.

NONHOG · 01-02-2014, 03:29 PM

I'm no expert but I'll assume G head and 455 you are talking Oldsmobile.
I'd stick with the 2200. Those 455's make plenty of torque. So your 3.90 gears are going to get to the 5000 RPM limit these engines like real fast.
Hurrying that along with a higher stall probably works great for a SBC but likely not needed for a 500 ft. lb. Olds.

my 2cent.

storm9c1 · 01-02-2014, 10:17 PM

A higher stall will make it a fun ride but a dangerous one with that much torque kicking in at 3200. I'd say go with the 2200. That sounds like a good match to your combo.

I'd also be curious how long that TH350 is going to hold up. The lower stall may help save it? ... good luck. It's a tough trans, but that engine is a torque monster.

cableguy0 · 01-02-2014, 10:25 PM

Big inch motors usually don't need a high stall especially when kept mild. With your powerband I would stick with that 2200 converter. That thing should liquify the tires at will with the amount of torque you will be making.

1000000to1 · 01-03-2014, 06:23 AM

Thanks guys, that's kinda what I thought but I haven't had a lot of experience with this so I was second guessing my research. This is an olds motor sorry I forgot to mention that. I can't wait to get it in the truck. Here's a pic of the motor.

NONHOG · 01-03-2014, 04:09 PM

Other than hurting my neck

that thing looks sweet!
Here is mine. (still waiting for me to degree the cam)

1000000to1 · 01-04-2014, 06:27 AM

Don't know what happened to that pic, ya like your valve covers. How old are those?

1000000to1 · 01-04-2014, 06:34 AM

Here's a better one.

NONHOG · 01-04-2014, 01:44 PM

Quote:

Originally Posted by 1000000to1

like your valve covers. How old are those?

? Not sure as they came with a package deal.... more info here
http://67-72chevytrucks.com/vboard/s...d.php?t=475824

Can't wait to see your engine installed!

storm9c1 · 01-04-2014, 07:29 PM

Nice!

1000000to1 · 01-05-2014, 05:22 AM

Sweet olds, I used to have a 72 cutlass S in mint condition with a 350 rocket. My dad bought it new and sold it about 18 yrs later. I asked the guy a few years later if he would sell it and he did, I paid a lot but it only had around 50000 original miles. A few years later I sold it being young and not having enough money to store it. Regretted it ever since. Wish I could find one to throw this motor in haha.

01-02-2014, 02:59 PM	#1
1000000to1 Registered User Join Date: Sep 2005 Location: Bienfait, Saskatchewan, Canada Posts: 308	455 torque convertor? I have a 455 bored .30 over with a 453/456 valve lift cam, air gap intake, slightly ported g heads with an 870 streetavenger. Block has been decked and line bored etc. I'm putting a th350 behind it with a shift kit and just wondering what stall I should run? The cam is 1000-5200 rpm. I ordered a 1800-2200 convertor because everyone always says to stay close to bottom of powerband but I talked to another company that figured I should run a 3200. Now I'm not sure. I'm putting it into a 58 gmc with a 3:90 rearend and am just using it as a Sunday driver and to melt some rubber when I feel the need. Thanks for your help. __________________ 2013 avalanche 5.3l 1971 Gmc 350 1958 Gmc fleetside

01-02-2014, 03:29 PM	#2
NONHOG Registered User Join Date: Feb 2007 Location: Marana, Arizona Posts: 3,459	Re: 455 torque convertor? I'm no expert but I'll assume G head and 455 you are talking Oldsmobile. I'd stick with the 2200. Those 455's make plenty of torque. So your 3.90 gears are going to get to the 5000 RPM limit these engines like real fast. Hurrying that along with a higher stall probably works great for a SBC but likely not needed for a 500 ft. lb. Olds. my 2cent. __________________ "I feel the need for speed!"... as soon as I am done with my nap.

01-02-2014, 10:17 PM	#3
storm9c1 * That's interesting * Join Date: Oct 2008 Location: Pittsburgh, PA Posts: 2,772	Re: 455 torque convertor? A higher stall will make it a fun ride but a dangerous one with that much torque kicking in at 3200. I'd say go with the 2200. That sounds like a good match to your combo. I'd also be curious how long that TH350 is going to hold up. The lower stall may help save it? ... good luck. It's a tough trans, but that engine is a torque monster. __________________ Tom Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others... Last edited by storm9c1; 01-02-2014 at 10:43 PM.

01-02-2014, 10:25 PM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: 455 torque convertor? Big inch motors usually don't need a high stall especially when kept mild. With your powerband I would stick with that 2200 converter. That thing should liquify the tires at will with the amount of torque you will be making. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

01-03-2014, 06:23 AM	#5
1000000to1 Registered User Join Date: Sep 2005 Location: Bienfait, Saskatchewan, Canada Posts: 308	Re: 455 torque convertor? Thanks guys, that's kinda what I thought but I haven't had a lot of experience with this so I was second guessing my research. This is an olds motor sorry I forgot to mention that. I can't wait to get it in the truck. Here's a pic of the motor. Attached Images __________________ 2013 avalanche 5.3l 1971 Gmc 350 1958 Gmc fleetside

01-03-2014, 04:09 PM	#6
NONHOG Registered User Join Date: Feb 2007 Location: Marana, Arizona Posts: 3,459	Re: 455 torque convertor? Other than hurting my neck that thing looks sweet! Here is mine. (still waiting for me to degree the cam) Attached Images __________________ "I feel the need for speed!"... as soon as I am done with my nap.

01-04-2014, 06:27 AM	#7
1000000to1 Registered User Join Date: Sep 2005 Location: Bienfait, Saskatchewan, Canada Posts: 308	Re: 455 torque convertor? Don't know what happened to that pic, ya like your valve covers. How old are those? __________________ 2013 avalanche 5.3l 1971 Gmc 350 1958 Gmc fleetside

01-04-2014, 06:34 AM	#8
1000000to1 Registered User Join Date: Sep 2005 Location: Bienfait, Saskatchewan, Canada Posts: 308	Re: 455 torque convertor? Here's a better one. Attached Images __________________ 2013 avalanche 5.3l 1971 Gmc 350 1958 Gmc fleetside

01-04-2014, 07:29 PM	#10
storm9c1 * That's interesting * Join Date: Oct 2008 Location: Pittsburgh, PA Posts: 2,772	Re: 455 torque convertor? Nice! __________________ Tom Chevy by day... 1969 Chevy C30 Rollback Tow Truck -- 383 stroker, 4L80E 2011 Chevy Caprice PPV 9C3 6.0L 1995 Chevy Caprice 9C1 1994 Chevy Caprice 9C1 #3 1995 Chevy Caprice Wagon #2 1995 Chevy Impala SS Mopar by night... 1969 Dodge Charger 1972 Chrysler Newport 2dr Hardtop (27K miles) Plus others...

01-05-2014, 05:22 AM	#11
1000000to1 Registered User Join Date: Sep 2005 Location: Bienfait, Saskatchewan, Canada Posts: 308	Re: 455 torque convertor? Sweet olds, I used to have a 72 cutlass S in mint condition with a 350 rocket. My dad bought it new and sold it about 18 yrs later. I asked the guy a few years later if he would sell it and he did, I paid a lot but it only had around 50000 original miles. A few years later I sold it being young and not having enough money to store it. Regretted it ever since. Wish I could find one to throw this motor in haha. __________________ 2013 avalanche 5.3l 1971 Gmc 350 1958 Gmc fleetside



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