1980 Olds Cutlass

gscott819 · February 3rd, 2009, 08:04 AM

I just recently bought a 80 model cutlass from a mechanic shop that had been sitting for some years.The engine was changed but I want to know how to determine the size of the engine.

joe_padavano · February 3rd, 2009, 08:24 AM

Quote:

Originally Posted by gscott819

I just recently bought a 80 model cutlass from a mechanic shop that had been sitting for some years.The engine was changed but I want to know how to determine the size of the engine.

The first question is, is it a V6 or V8? These cars were available with either Olds V8 motors or Chevy V8 motors (in addition to the Buick V6), and if it's been changed it could be almost anything. An Olds V8 will have an oil fill tube at the front of the engine above the water pump. A Chevy will usually have the oil fill cap on one of the valve covers. If it is an Olds motor, there is a casting number on the little shelf next to the oil fill tube. Post that number here and we can tell you what the block is.

gscott819 · February 3rd, 2009, 09:24 AM

these numbers came off the top of the block 4790 GM 5.0LG.Thanks Gene

Oldsguy · February 3rd, 2009, 10:19 AM

Gene,

Welcome to our site. 5 liter engine is a V8.

gscott819 · February 3rd, 2009, 11:16 AM

Yes I know it is a V8,how do I determine if it is a 305,307,350 etc.

citcapp · February 3rd, 2009, 01:37 PM

Its a 305. use the internet. Type in liters to cubic inche calculations. Several pop up

Oldsguy · February 3rd, 2009, 02:17 PM

I think that would mean it is a chevy engine.

dan2286 · February 3rd, 2009, 02:45 PM

Dont some of the 307s have those numbers? Where is the oil fill at, on the valve cover or above the waterpump?

joe_padavano · February 3rd, 2009, 03:19 PM

Quote:

Originally Posted by citcapp

Its a 305. use the internet. Type in liters to cubic inche calculations. Several pop up

Since there are a little more than 6 cubic inches in a tenth of a liter, displacements from 302 to 307 cu in round off to 5.0 liters. Heck, the LS1 version of the Chevy 5.7 liter engine is actually 345 cu in, not 350.

As for this particular engine, the casting numbers sound like an Olds 307.

February 3rd, 2009, 08:04 AM	#1 (permalink)
gscott819 Registered User Join Date: Feb 2009 Posts: 13	1980 Olds Cutlass I just recently bought a 80 model cutlass from a mechanic shop that had been sitting for some years.The engine was changed but I want to know how to determine the size of the engine.

February 3rd, 2009, 10:19 AM	#4 (permalink)
Oldsguy Hot Rodder at heart Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 5,360	Gene, Welcome to our site. 5 liter engine is a V8. __________________ Dan '77 Cutlass Supreme '46 2 door "The rocket 455.....it's a sledgehammer approach to a thumbtack world" LuxBlue of HAMB.

February 3rd, 2009, 01:37 PM	#6 (permalink)
citcapp Super Moderator Join Date: Nov 2007 Location: Bothell, WA Posts: 3,453	Its a 305. use the internet. Type in liters to cubic inche calculations. Several pop up __________________ Pat 1957 Super 88 with a 455 1948 2dr series 76 with a 455

February 3rd, 2009, 02:17 PM	#7 (permalink)
Oldsguy Hot Rodder at heart Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 5,360	I think that would mean it is a chevy engine. __________________ Dan '77 Cutlass Supreme '46 2 door "The rocket 455.....it's a sledgehammer approach to a thumbtack world" LuxBlue of HAMB.

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February 3rd, 2009, 09:24 AM	#3 (permalink)
gscott819 Registered User Join Date: Feb 2009 Posts: 13	these numbers came off the top of the block 4790 GM 5.0LG.Thanks Gene

February 3rd, 2009, 11:16 AM	#5 (permalink)
gscott819 Registered User Join Date: Feb 2009 Posts: 13	Yes I know it is a V8,how do I determine if it is a 305,307,350 etc.

February 3rd, 2009, 02:45 PM	#8 (permalink)
dan2286 Registered User Join Date: Mar 2008 Location: North Ridgeville, Ohio Posts: 338	Dont some of the 307s have those numbers? Where is the oil fill at, on the valve cover or above the waterpump?

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