adurso19@yahoo.com

I've got a 60 corvette with a 400 cu in small block. I also have a 1960 283 out of a full size Chevy. I want to build the 283 to the specs of the 270 horse motor of a 60 corvette and install it in my 60. I can't seem to get straight answers on building it. I have two WCFB carbs that came on a 60 vette also a 60 dual quad manifold. I'm trying to find out what cfm's the carbs need to be, What heads were used, and what cam was used.I also have a rebuilt set of stock 60 Vette heads # 3774692. Anything else I'm forgetting would be helpful. Thanks, Tony

JohnZ

WCFB's are 390 CFM. 1960 Corvettes all used the 692 heads, and the 270hp engine used the "097" Duntov cam.

rich5962

To add to John's info, you can get the AMA specs with lots of pertinent engine information. Download the 1960 spec and it may help.

https://www.gmheritagecenter.com/gm-...tion-kits.html

This is a '60 270 I did last year.

Rich

adurso19@yahoo.com

Thanks John, I should have gone to the forum first. Are 692 heads the ones I have ,#3774692 with 1.72/1.50 valves?

adurso19@yahoo.com

Thanks, John. I should have gone to the forum first. Are the heads I have #3774692 with 1.72/1.50 valves the same as 692's ?

MikeM

Not John, but yes. The same heads.

adurso19@yahoo.com

Thanks Rich I'll check out the site. That 60 Vette you did is fantastic.Mine is Roman Red , originally black but I knew I'd never get it as straight as your project is. Thanks again

adurso19@yahoo.com

Thanks, Rich I'll check out the site. The 60 Vette you did looks fantastic. My 60 Vette is Roman red, originally black but I knew I'd never get it as straight as the black 60 you did. Thanks again.

adurso19@yahoo.com

Thanks, Mike (I think) Another question. The 283 that I have has hydraulic cam and rockers. I'm assuming I will have to change the rockers If I put a 097 Duntov cam in. which has solids or will the hydraulic rockers work? I've done some stock rebuilds but modifying engines has me stumped. Again, thanks for the help. Tony

jim lockwood

There is no such thing as "solid rockers" or "hydraulic rockers". They were all the same.

The only issue you might have, and this is highly unlikely, would be if someone installed what are called "self aligning" rockers. These can not be used with a solid lifter cam. It's unlikely your engine has these as they are found on more recent production engines.

adurso19@yahoo.com

Jim, many thanks.I can get started on the rebuild now. Tony

rich5962

Those are 1960 only heads, meaning that's the ONLY head used in 1960, so cherish them.

Not that it's needed for the 270, but originally the 270 came with the special Top Tank radiator. Just a FYI.

You can get the Sealed Power brand equivalent of the 097 cam and solid lifters directly from NAPA and others.

Cam CS113R

Lifters AT992

Pistons should be flat top for the 270HP. I use Keith Black hypereutectic(sp?) You can search Summit, etc.

Your carburetors are the correct duals?? Make sure they're not Passenger car types with the thick bases. Correct 2x4's use a thin cast iron base, and the Primary(rear) carb uses a "high" mount choke. Also unique secondary counterweights and shafts. The carb air horns and main bodies have unique cast part numbers. You may want to record them and post here so you know what you have. The bases have numbers but can only be seen with the body removed. The stamped numbers on the base backside are not the correct identifiers.

Rich

MikeM

The "692" head was used on '60-'61 Corvettes and passenger car engines. Four barrel engines and bigger.

adurso19@yahoo.com

Thanks Rich, I think my carbs are passenger car carbs. air horn # 6-1396. base #1-1579 low mount choke. I ran these together on the 400 small block on the 1960 alum. snowflake manifold in the Vette. What is the problem running them in the 283? Is it correctness or won't they work on the 283? Thanks again, Tony

3310vette

The passenger car carb baseplate is thicker and by the time you install a Vette air cleaner, the air cleaner will interfere with the closing of the hood.

rich5962

Yes it could be a hood clearance issue, however, I had a '57 Corvette base WCFB as a Primary(rear) on my '59 2x4 setup a long time.

The primary issue is that if they are not original spec they may not match your overall build... performance wise. These old WCFB's can be any combination of jets and metering rods and major parts like bodies, air horns, chokes, secondary counterweight valves, bases etc, etc.

Just be cautious when you build your engine you might have a little trouble with those particular carbs. They may be made up of many unknown pieces.

....."air horn # 6-1396. base #1-1579"
A quick peek at some info tells me the........
6-1396 was used on the 59-61 1x4 engines
1-1579 was on the '62 1x4 engines

The '60 2x4's used the 0-049 or 0-1049 Main Body. 15/16" diameter venturi.

adurso19@yahoo.com

I ran these carbs in the Vette on a 400 small block and the hood was close enough for the wing nuts to scratch the underside of the hood. A little touch up paint hid it pretty well. I imagine the same thing is going to happen with the 283. Thanks for the help 3310vette.

adurso19@yahoo.com

Point well taken Rich. I had a tough time getting the two wcfb's to work on the Vette on the 400 cu in small block. Even with an Edelbrock performer plus cam it still ran rich and was hard starting after running it a while. Maybe I can re jet them and together with the 097 cam I might be ok. Thanks for the info.