67CutlassNut

Am I nuts to want to build a moderate Street engine with my 330 I would like to see it around 500 hp.
Is being different going to empty my account LOL

67CutlassNut

Hi guys!!😁
picked up at 67 Oldsmobile cutlass butternut yellow numbers matching three 330?motor with a two speed powerglide I am currently installing a 12 bolt rear end with 410 gears my question to you all is should I keep the 330 and sync some money into it as it already has some performance parts or do I look for a bigger block? I would like to be around the 500 hp with a little bit of nitrous oxide to play with at the track.
I am not an Oldsmobile guru I have been a Chevy guy my whole life and any information would be greatly appreciate
Thank you for all of your support!!!

coppercutlass

Yup. You're nuts

Bfg

Please don’t bastardize this Olds with Chebby parts. I guess I’m just a purist! Just my opinion. Oldsmobile’s don’t have Powerglide transmissions. They are called Jetaways or turbine 300

JohnnyBs68S

Welcome to CO, you've come to the right place for info on Olds.

I've not seen any 330 builds eclipsing 400 HP N/A, I think it'd be hard to get to 500 HP even w/ NO2. 500 HP would be a cake walk w/ a 455, or if you want to stay w/ a SBO, cutlassefi can fix you up w/ a ~7L stroker that can hit that and then some.

And, yeah, just because its a 2-speed AT doesn't make it a Powerglide. BOPs used a ST300 (Super Turbine 300), aka "Jetaway" in Oldsmobiles. Different design than the Chevy Powerglide, and can't be built to handle high power engines like a Powerglide. With a 4.10 rear gear, unless you are OK w/ 4000 RPM on the highway, you may want to consider a (properly built) 200-4R swap.

bigrbandit

If you want those kinds of power numbers, you should start with a 455, and plan on about $5000. Or go LS, add cam and valvesprings.

67OAI

The 330 is often overlooked as a performance engine because of it's small bore. It can easily be bored to 4.00" and with a set of flat top pistons you end up with a good compression ratio. Larger valves and some pocket work along with a decent intake manifold and headers help. The 1967 version of the 330 should have the 39 degree lifter angle so camshaft selection would be easy. That type build could easily get you 350 to 400 horses. I helped a friend put together a 4" bore 330 many years ago. His was a 1966 version with the 45 degree lifter bank but at the time an inexpensive performance cam was available for the 425 motor and we used that. The heads remained stock with a good clean up and valve job; pistons were discarded from a stock bore 400 Olds. An Edelbrock intake and 750 Holly carb, big block headers which hung a little low, a 4speed trans and 4.88 rear gears in his Cutlass and he ran 12.70 in the quarter. I was impressed. Of course the 350 would be a better base to start with because of the larger bore.

oldcutlass

I merged your 2 threads, there is no need to ask the same question in multiple forums. Yes, there will be a great sucking sound coming from your account. Starting with a BBO would easier and less expensive. SBO headers are very expensive.

cjsdad

500 hp is doable with a sbo, I have one. It's even going into a '67 Cutlass (convertible). It's a bit spendy though. I, well, cutlassefi, started with a 350 block and that is the only thing that is original. Aftermarket crank, LS rods, Voodoo cam with roller valve trane, aluminum heads, etc. This is not a weekend garage build. Because I live on the side of a mountain and can go up or down as much as 5000 ft in elevation in less than an hour I opted for multiport EFI but the engine can be done with carb as well.

The less expensive Olds option is to start with a 455.

tmaleck

I have a 403 in my 67. 7a heads reworked, Voodoo flat tappet cam GoEFI and other stuff. About 400hp at the wheels. Lots of torque with those coffee can pistons lol. I have a modded 700R4 and a 4.10 rear gear. Plenty of power but as has been said, not cheap. I got a smokin (literally) deal but a strong running sbo is possible.
Tim