TripDeuces

Is there an easy way to tell if you have the high or low compression 330ci? It came with a Quadrajet and a Jetaway 2pd.

Thanks,
George

scubastever

i believe the 330 in 66 was high compression (10:25 : 1 ) on the 4 barrel intake applications...
2 barrel had a lower compression ratio (9:1)




V8 - 330 2-BBL250 @ 4800335 @ 2800 (bore x stroke) 49.63.938 x 3.385 CR 9:135
V8 - 330 4-BBL320 @ 5200360 @ 3600 (bore x stroke) 49.63.938 x 3.385 CR 10.25:135

stan 65 cutlass

im sure the heads were the same size, but the pistons are the difference,cam may be different as well i think

stan 65 cutlass

im sure the heads were the same size, but the pistons are the difference,cam may be different as well i think, by the way your avatar is creepy.

TripDeuces

Lol, I'm sure the old school guys can tell you what that avatar is from. This will be a good trivia question. Circa 1971

Thanks for the info all.

tonycpe

easy way to tell?
try to run it with low octane gas .
My '67 330 high compression cutlass only likes 93 octane.

stan 65 cutlass

o ive seen clockwork orange many years ago, twisted stanley kubrick. its still creepy looking lol

Warhead

Would you rather he replaced it with a Barney avatar?
THAT WOULD BE CREEPY HERE!!!
Jim

stan 65 cutlass

better yet run his avatar on barneys web site

joe_padavano

I've felt the same way ever since I saw that avatar. It was creepy then and it still is.

TripDeuces

Wow, tough crowd

67 Cutlass

Yea, I went to high school with a guy that looked just like your avatar. YES... he was creepy! I do remember Clockwork Orange... strange stuff for sure!

Sooo... back to the OP. There should be a W stamped on the head after the numbers. I think that's suppose to indicate a high compression 330?

TripDeuces

I know it doesn't like low octane fuel so I'll look for that 'W' tomorrow.

Oldsmaniac

HC would have an orange/red air cleaner and gas cap would say premium fuel only if the original ones are still there with car.

TripDeuces

Good to know, thanks. My AC is red/orange and I think gas cap is original. I'll check tomorrow. Out of curiosity what color AC is the low compression one?

Oldsmaniac

Low Compression would have come with a black air cleaner.

linear59look

The low compression ones were black, and if im not mistaken they use a different, smaller housing that has a longer, thinner and more rounded snorkel.

67 Cutlass

To correct myself... there should be a G at the end of the stamped pad on the passenger side head.

TripDeuces

Just checked the heads and they do indeed have a 'G' stamped on them. The gas cap also says 'Important Use Premium Fuel Only' I appreciate all the good information everyone. I'm happy I have the high compression engine but it just seems sluggish to me. I guess I'll have to fix that with the big block and the Tri-Carb setup

Thanks,
George

citcapp

Now your talking!!!!!!!!!!!

scubastever

theres also the forced induction option ...

Racing Palm Tree

So what does the W indicate? I have "W" and am curious if I have a High Compression engine

wmachine

Page 05 of the Chassis Service Manual tells you what the engine unit numbers mean. Available free of charge at Wild About Cars:
http://wildaboutcarsonline.com/cgi-b...aldisplayed=50

Wild About Cars. http://wildaboutcars.com. An information supersource, especially Oldsmobile. More Olds content than anywhere else on the internet and continuing to grow.
You'll find Chassis Service Manuals, Product Information Manuals (AKA Assembly Manuals), Inspector's Manuals, and other documents that will contain this and much much more.
Dealer Brochures, magazine ads and articles, and the Automotive History Preservation Society library growing daily.
Free to join, free to learn.

oldcutlass

Check and make sure the transmission switch pitch function is working correctly. If it's not it can be a real dog. Engine timing is also very important. Also ensure your throttle linkage is opening the carb all the way at WOT.

jag1886

I saw that movie when it first came out, it was weird and creepy then but compared to todays crap it's pretty mild, I have it in my DVD collection.
I always think of Clockwork when I hear Ludwig Van.

67cutlassguy

high compression heads for 66-67 will have a stamp starting with W, then production#, then end in G.

67cutlassguy

...no offense, that avatar/picture is kinda dumb! Lol get a nice picture of an olds, or a nice set of *****/butts

67cutlassguy

😃

67cutlassguy

[QUOTE=67cutlassguy;1055972]...no offense, that avatar/picture is kinda creepy Lol get a nice picture of an olds, or a nice set of *****/butts

brianbeez67

If your still following this thread, the "W" on the head stamp should mean its a 330 engine followed by numbers then a "G" or "L" (low compression) hope this helps you out.

TripDeuces

Yup, still following. The engine is sitting in my garage as I restore the car. It's for sale too.