History the 427 Mystery, mystery

Yep, them is the two...

 

the bores on the Mark IV gaskets are notched for valve clearance.

 

Neither look to have round bores..

 

Yes, I noticed that too.

 

I had a big block 402, and it was out of an early 70s 1/2 ton. I don't know for certain, but back in the day, I was told that, in some models, if you ordered the 400 2bbl, you got the small block. If you ordered the 4bbl, you got the big block. I didn't much care, because I was only interested in big block engines.

 

I saw one in Vancouver in 1963. It was listed as a 427/435 horse and it was fast. I had no idea how special it was at the time. Couldn't have been that expensive, a longshoreman owned it

 

That's funny.... In 1963 the guys I knew with the most $$$$ in the pockets were Longshoremen. Like was stated some actually showed up a dealerships. The guy could just walked in at the right time wanting a 63 409 and bought a true Z11.... If it just could have been a Biscayne with no back seat or operating rear windows....

 

It is too long ago to remember the exact model of the car, I only saw it and talked to the guy a few times while I was working as a gas jockey.
I was in love with the W engines because one of my buddies had a 409/409, and it went like stink.

 

The base price of a 1963 Impala was $2774.00. Adding the price of the R.P.O. Z-11 option of $1240.00 to that brings the total price just over $4000.00 not including destination charges, taxes, etc. http://www.348-409.com/z11.html

• Produced only in 1963
• The R.P.O. Z-11 option was an additional $1240.00
• Shipping weight-3245 lbs.
• Curb weight-3405 lbs.
• 57 Z-11 Impala's were produced
• Modified 409 engine rated at 430hp@6000 RPM's. (Actual horsepower was 480-525)
• Block casting #3830814. Code "QM"
• Block part number #3838253
• Cylinder Heads #3837731 2.19 intake/1.72 exhaust
• Valve Covers #3837739 (left), #3837740 (right)
• Oil pan (deep sump) #3816322
• 2 piece Intake manifold #3830623 (top)-#3837733 (bottom)
• Waterpump #3837691 (aluminum)
• Cam #3837736 .556 intake/.556 exhaust lift with 325 duration
• Crankshaft #3837472
• Distributor #1111023
• Coil #1115107
• Generator #1100628
• Starter #1107274
• 3.65" piston stroke
• 4.3125" bore (same as 409)
• 13.5:1 compression ratio
• Special cowl induction air cleaner #6418986, #3839764 (duct)
• Tach (redlined at 6200 rpm's)
• Borg Warner T-10 4 speed transmission (close ratio)
• Special posi rear with 4.11:1 rear gear ratio
• Sintered metallic brake shoes
• Screened rear brake backing plates with air scoops
• 15 X 5.5 wheels with 6.70 X 15 bias ply tires
• Front coil springs #3824693
• Rear coil springs #3824694
• Deleted front sway bar
• Optional sound proofing and insulation delete on most
• Optional heater delete on most
• Hood #3837710 (aluminum)
• Hood catch #3837718 (aluminum)
• Grill filler panel #3837750 (aluminum)
• Left fender #3837765 (aluminum)
• Right fender #3837766 (aluminum)
• Front bumper center #3837751 (aluminum)
• Front bumper LH #3837755 (aluminum)
• Front bumper RH #3837756 (aluminum)
• Rear bumper center #3837752 (aluminum)
• Rear bumper LH #3837753 (aluminum)
• Rear bumper RH #3837754 (aluminum)
• Front bumper bracket LH #3837763 (aluminum)
• Front bumper bracket RH #3837764 (aluminum)
• Rear bumper bracket LH #3837757 (aluminum)
• Rear bumper bracket RH #3837758 (aluminum)
• Rear frame to bumper brace LH #3837759 (aluminum)
• Rear frame to bumper brace RH #3837760 (aluminum)

 

It was more than that in Canada because of the import duty. I don't know know how much duty, but I think it was 25 %