[steve25]

The 455 weighs in at 8 lbs more then the 350 and yet makes a easy 50 more ft lbs of torque in a far more street / strip frendly rpm range even if it's only at 8.2 compression!

If the 455 was a 4 bbl motor then it has better heads then the 350 also.

I gues you know what my pick would be!

[sdbob]

455 hands down. Only problem is handling the torque. Clutch,rear, suspension needs reinforced or at least checked for good welds,rust.

[David Jones]

The 73 455 I have in my car had 4X heads and appeared to be as mother GM built it when I got it. I sweated the pilot bushing thing too, since I had already installed a TKO in the car. It turned out the 455 was machined for a pilot.

[OCMDGTO]

455 all the way!

[JLuger]

It looks like it's a factory 4 barrel motor.

[Hammertime Mike]

I too needed a bushing fitted on my 455 build. Not a big deal.

[1965gp]

For 1200 I would jump on the 455. Then offer 500 for the 350

["QUICK-SILVER"]

Originally Posted by JLuger

It looks like it's a factory 4 barrel motor.

73' YC is a factory 4bbl.

Doesn't really matter, but I think you need to check P/N and date code on that intake. It is a factory intake but I don't think it's a 73'. Looks like I see an EGR valve. Don't recall seeing EGR on 'non' CA smog engines. Far as I know the YC wasn't CA smog rated.



IDK
Clay

[JLuger]

Ok gd info picking it up sat.

[Sirrotica]

Originally Posted by "QUICK-SILVER"

73' YC is a factory 4bbl.

Doesn't really matter, but I think you need to check P/N and date code on that intake. It is a factory intake but I don't think it's a 73'. Looks like I see an EGR valve. Don't recall seeing EGR on 'non' CA smog engines. Far as I know the YC wasn't CA smog rated.



IDK
Clay

FWIW, 1973 was first year for EGR valves on 49 state engines, I've owned a few of bone stock cars 400s and 455s and they all had EGR systems on them. Plus over the years have worked on many of my customer cars that all 1973 Stratostreak V8s came with EGRs on them.

[JLuger]

Took a couple of screenshots from video he sent, not sure if you can tell from them.

[steve25]

It looks like a AFB square Bore Carb on a adapter to mate it to the factory Qjet Intake.

That fuel filter sitting right onto of the very hot Exh crossover section of the heads needs to be relocated!

[carbking]

Originally Posted by ANDYA

A 350 can be made to run pretty strong, BUT I would never put one in a real GTO. For me it would have to be a 389 or larger. I think most GTO enthusiasts would feel the same way.

Real GTO's came with a 350 in 1974.

Jon.

[steve25]

Well if you want to get into detail about the last true GTO was in the A body line, not the relabled Chevy Nova body line .

[Will]

LOL, love these discussions.

But yeah, 455 all day long. Will feel much more powerful due to all the torque it'll make. Cubic inches is what makes torque. Build two engines with the same heads, cam, intake, exhaust, carbs and compression ratios but one is a 350 and one is a 455 and they'll make close to the same Horsepower on a dyno but the 350 will make it at much higher RPM and have less torque overall. The 455 will make a LOT more torque and at lower RPMs.

I have a bone stock '73 455 in my Formula currently. It doesn't want to run out past about 4500 RPMs but it absolutely shreds the tires from a stop or at low speeds. A 350 won't do that.

[David Jones]

Originally Posted by steve25

Well if you want to get into detail about the last true GTO was in the A body line, not the relabled Chevy Nova body line .

That makes no sense.

Based on that, the A body GTO was simply a relabeled Chevelle.

[JLuger]

[QUOTE=Will;6102314]LOL, love these discussions.

But yeah, 455 all day long. Will feel much more powerful due to all the torque it'll make. Cubic inches is what makes torque. Build two engines with the same heads, cam, intake, exhaust, carbs and compression ratios but one is a 350 and one is a 455 and they'll make close to the same Horsepower on a dyno but the 350 will make it at much higher RPM and have less torque overall. The 455 will make a LOT more torque and at lower RPMs.

I have a bone stock '73 455 in my Formula currently. It doesn't want to run out past about 4500 RPMs but it absolutely shreds the tires from a stop or at low speeds. A 350 won't do.

The GTO it's in has 60's out back and he said it just shreds the tires. LOL

[242177P]

Originally Posted by David Jones

That makes no sense.

Based on that, the A body GTO was simply a relabeled Chevelle.

That only works if you ignore almost all the A-body sheetmetal.
73+ X cars shared quarter panels, doors, fenders, trunk lids, etc.

Nova
Omega
Ventura
Apollo

[Will]

Originally Posted by JLuger

...

The GTO it's in has 60's out back and he said it just shreds the tires. LOL

Well, if you'd really rather have the 350, then go for it.

There's a reason Pontiac put 455s in their biggest, heaviest cars rather than 350s. There's a reason why guys who want to go as fast as possible build bigger engines too. If none of that's important, any old engine will do. Heck, you could always put a turbo on that 350.

[David Jones]

After looking at the photos, you can tell it’s not really a Pontiac.
Wrong color.