ditchdigger650

Did all 1967 427's have an 80lb oil gauge, or just the 435 horse and L-88's. I've seen a few 390 horse cars with a 60lb gauge, just curious.

ktchir

I believe all BB mid years had the 80 psi gauge regardless of HP.

ktchir

My 66 390 HP, factory air had the 80 psi gauge, I was the third owner and I am fairly certain it was never changed. (I could be wrong, but....)

DansYellow66

I think you're right - I believe my 66 427/390 had an 80 lb gauge also. But, it was a long time ago and I couldn't swear to it.

Dan

'67 Mann

According to the NCRS judging guide only the 425 hp 427's received
the 80 lb oil pressure gauge.

RestoMike

Well now.....mine's a original 427/390 and has the 80lb. gauge....correct for the engine. Hate it when I trip over absoluteness :-o.

'67 Mann

Are you the original owner all these years ? If not could someone
have put an 80 lb. gauge in when they upgraded the oil pump or modified the car ?

Sorry even Noland Adams books says 60 lb. gauge for the 390/427.

66BlkBB

We've gone through this on prior threads. There are to many
427/390's out there with the 80# gauge to believe that all were replaced due to changed oil pumps, etc. This includes mine, which was parked from 1972 through 1979 when I bought it with the 80# unit in it.

Dicecal

Mech cam= 80 psi oil gauge
Hyd cam= 60 psi oil gauge

Always some variations...

knight37128

like beating a dead horse around here sometimes.

wmf62

or...


Bill

ditchdigger650

Sorry I brought it up.

ktchir

No need for an apology...it's a healthy discussion on the forum and realize that there are no absolutes when it comes to knowing everything about these cars.

DansYellow66

Sorry to be a skeptic - but just because someone might have replaced or upgraded an oil pump sometime way back when, I doubt changing out the gauge at the same time was also on their mind. The HD oil pumps were built, according to my Chevrolet Power Book for the the LS-6/L-88 and for the ZL-1 with 1.3 in gears versus the standard 1.14 inch gears. I think the L72 and L36 used the same oil pump and either would work fine with the either the 60 or 80 lb gauge. The 80 lb gauge was no doubt intended for the mechanical lifter BB motors, but that it would also end up in a lot of L36 clusters also wouldn't surpirse me at all. Either motor would probably peg a 60 lb gauge when cold and when a L72 was above 6000 rpm but my NOM does that with an 80lb gauge too. My 2cents.

66BlkBB

Nothing against your question. I believe that a lot of the original 427/390's came with the 80# gauge no matter what Nolan Adams or NCRS says. I am confident that mine is original as are other owners who have the 80# gauge in their cars.

63split63

My 66 L36 has an 80lb gauge . Noland Adams book was writen a long time ago .
Bill:

Skytop111

No engine runs at 80 pounds of oil pressure. Even with super high performance engine oil pumps, engine rarely run over 65 pounds and that is when they are cold and the oil is most viscous. So a 70 pound gauge is preferable since it shows most needle deflection per pound and is most easy to read accurate pressure.

65hihp

welcome to the Corvette Forum... You'll look far and wide amongst C1 and C2 Corvettes before you come across a 70 lb gauge..

66BBCoupe

My 1966 L36 427/390hp Coupe was built November 1965. I purchased this Corvette as an un-restored survivor with complete original interior including dash cluster and pad. All factory electrical harnesses were present. It has an 80lb oil pressure gauge. No I was not the original owner and no I can not claim to know if the gauge was changed. It does appear to be original with no indications whatsoever that it is not original.

DansYellow66

Thats not necessarily completely correct. My 66 427 (probably has a high pressure pump) keeps the gage pegged for around the 10 - 15 minutes upon starting with 15W-40. Even when warm I’m pretty sure it can peg the gage on acceleration but who looks at it at 6500 rpm? My 66 Hemi is pretty much the same.