WANTED: Oldsmobile 403 crank for 1979 Trans Am

[1968firebird455]

WANTED: Oldsmobile 403 crank for 1979 Trans Am. Part number: 556607

[74SDformula]

I believe the 350 and 403 share the same casting number crankshaft. However, they are balanced differently. From what I remember there is a visual identifier on the 403 crankshaft.

[ROCKETMAN269V]

I have a couple of 403 specific crankshafts. I can ship via Fastenal, unless you know someone coming down to our Winter racing paradise. I'm near Bradenton Motorsports Park, Orlando Speed World and can hear the cars at Sebring Raceway from my back yard. Please let me know if you're interested. Thanks, Bob. :usflag:
PS: The casting # that you referenced is actually a late model, lightweight crankshaft. I do have those also, if interested. Please let me know. Thanks, Bob.

[ROCKETMAN269V]

WANTED: Oldsmobile 403 crank for 1979 Trans Am. Part number: 556607

The casting # that you referenced is actually a late model, lightweight crankshaft. I do have those also, if interested. Please let me know. Thanks, Bob.

[1968firebird455]

I am interested! Please PM me a price and shipping to North Royalton, OH

[ROCKETMAN269V]

I am interested! Please PM me a price and shipping to North Royalton, OH

Are you interested in the casting # that you posted or a true 403 crank?

390275 403 '77 - '79 Balance hole in the 1st throw, nice 1/8" or so
groove cut into the circumference groove on the #1
counterweight. Most drilled for manual trans use.
556607 350 '77 Plain iron. No 'N' on front weight. No balance hole.
"C" notch 5/8" deep, 1" wide.
556607 307 '85 This might be wrong. '77 350 is positive.

[1968firebird455]

The correct 403 crank.

[1968firebird455]

I'm also interested in connecting rods if you have any.

[ROCKETMAN269V]

I'm also interested in connecting rods if you have any.

I should have both; have to check over the weekend. Thanks, Bob.

[ROCKETMAN269V]

Received your PM; however, your inbox is full. I'll call you when I verify all parts. Thanks, Bob.

[1968firebird455]

I cleared out some messages so there is room in my inbox. Feel free to call or text me.