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Username Post: Casting #3956618 Engine        (Topic#194279)
Senior Member
Posts: 358

Loc: Ontario Canada
Reg: 12-26-02
07-15-08 06:29 PM - Post#1478515    

Hi everyone, I recently saw a add for a 1969 impala 327 motor for sale with the casting #3956618. I looked up the number and that is correct for a 327 impala that year but I also noticed the same number for a 307 and 350. The guy selling the motor bought it from someone else and he put it in a monte carlo so I am wondering if it really is a 327. How do I tell the difference between all 3 motors? Or what questions can I ask him over the phone to know for sure it is a 327? Thanks.

1962-C10 Truck Bodydropped,Bagged,Shaved ,Rollin on 15" 100 spoke player wire wheels
1963-Impala SS 327 4 speed (Needs total restoration) - progress has begun

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Posts: 305
Loc: ontario cda
Reg: 11-11-06
07-15-08 07:00 PM - Post#1478546    
    In response to PJ_STYLES_62chev

i think you meant 302, not 307. the 2 letter suffix code stamped in the front of the block behind the alternator will verify the engine size. all 3 sizes used this 4" bore block. the 302 and some of the 350 versions were 4 bolt mains.

Valued Contributor
Posts: 4066
Loc: Sweden
Reg: 08-23-07
07-16-08 03:49 PM - Post#1479137    
    In response to PJ_STYLES_62chev

Well are you deadset on a 327 or is it a healthy non smog engine you need?

Mortec - chevrolet casting numbers

info on Chevy stampings found here

If any of the 302, 350 or 327 is complete - i.e. unchanged - you will get a great engine.
I'm no expert but I think the 302 only came in z28 Camaros and they were nothing close to a 307. Underrated at 290hp I think. HP casting numbers like this tends to be used in HP whether it be 302 (rare) 327 or 350. Not likely the bread and butter engines, like 210hp 327. But read up on the links!

Use the links to find stampings to look for and heads casting numbers to look for. Date castings should be close if you want a pristine engine.

Have him state all casting numbers and date castings + the stamped numbers on the front pad.
He should be able to take good enough pics to verify whatever he says. Lifting the valve covers is definitely common courtesy! mp;fea...

Senior Member
Posts: 760

Loc: N. Muskegon, MI
Reg: 05-30-03
07-16-08 05:40 PM - Post#1479218    
    In response to Impala65SS

Yes, the 302 was a Camaro-only option. It needs a light car with steep gears and a four speed to realize its potential.

You won't find many original, unmolested 302s out there. If you do, they command $$$$$ and they were only factory made for three years.

'67 Biscayne
'72 El Camino
'86 El Camino

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