Ions91Z28

Not because I'm getting one...but my automotive teacher says they don't exist. Is he right?

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91 Z28
Best Time Slip:
60' - 2.098
1/8 - 9.137 , MPH - 76.21
1/4 - 14.213, MPH - 97.55
Performace Mods: B&B Exhaust, few free mods.
Appearance Mods: SS wheels, 2.5" Cowl Hood... New 100% Black paint job, Clear Side Marker Lights
Stereo: Alpine 855, Infinity Kappas all around, Infinity 150x2 amp (POS), Infinity Perfect 10 in hatch.
Pictures at Here
ICQ: 1437212
AOL: normalmatt9

RB83L69

They exist.

Look for 71-72 Impalas, with "400" badges on the side. There were 2 versions of "400"s, known conveniently as "400 2-barrel" and "400 4-barrel". The "400 2-barrel" was a small block with 4-bolt mains, easily identifiable by having 3 freeze plugs in the side of the block, unlike all other small blocks that have 2; the car came with single exhaust. The "400 4-barrel" was a 402 big block, something else altogether of course; those cars came with dual exhaust.

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"So many Mustangs, so little time..."
ICON Motorsports

Engineboy

They exist, and if I had a digital cam, I would give you a pick to show your teacher...I have one sitting in my garage.

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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R
and 2 POS commuters...

R.I.P. #3
"He can see air"

jms

iTrader: (1)

Early '70s Impalas (especially wagons), Caprices, Monte Carlos, and trucks all were available with 400 small-blocks which were 4-bolt mains for the first couple of years of production. In the later years (mid-70s) I've seen 400s in Chevelles also.
jms

Vader

I suppose he doesn't acknowledge the existence of the 300CI and 340CI (yes, 340) Buick V-8s, the 164 Chevy six cylinder, 326 Pontiacs, the Olds 330 and 394 V-8s, and the 429 inch Cadillac V-8s.

Yes, those numbers are all correct, and were produced by the millions. I guess I AM old...

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Later,
Vader
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"Get UP - Drop the bombshell!"
Adobe Acrobat Reader

AlkyIROC

The most popular casting numbers for 400's is 3951509. This is a 2 bolt block. Finding a 3951511 casting can get you a 4 bolt main but not always. You could find them in 70-73 heavy duty trucks and full size cars.

Finding a 400 block with 3 freeze plugs on the side instead of 2 is usually a 4 bolt.

Personally I wouldn't go looking for a 4 bolt 400 block. The amount of metal in the webbing is less and won't take as much force as a 2 bolt. The most popular thing to do to a 2 bolt is to install a stud kit to increase the strength or to install splayed caps.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block

Best ET on a time slip: 11.242 altitude corrected to 10.89
Best MPH on a time slip: 121.52 altitude corrected to 125.89
Altitude corrected rear wheel HP: 497.9
Best 60 foot: 1.546

Racing at 3500 feet elevation with a typical race day over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley