You are offerding on a 1972

400ciSmall BlockChevy engine/long block.

It came out of my 1972 Impala.

The engine was never raced but it needs rebuilding.

I've saved this engine for my project Corvette for 20 or more years. Howeverafter a motorcycle wreck in1997 that left mewith a bad back and part of my foot missingI know I won't be rebuilding anything..

The castingnumber is GM3951511.

This was the most powerful of the 400ci small block engines.

It was only made from 1970 to 1972.

Plus only those years had 4 bolt mains.

The engine has everything but intake and carb.

Including heads,water pump,pushrods,

lifters, valve covers, flywheel, damper and pan.

I'll throw in the engine stand.

Plus I think I have a Chrome Oil pan.

If I can find it I'll throw it in too.

The engine can be turned from flywheel by hand without spark plugs.

The 400 CID Chevy small block engine was produced from 1970 until 1980 and was the largest displacement engine made in that platform. It was intended as a low performance, high-torque engine primarily used in Chevy's heavier passenger cars and light-duty trucks. The general design was the same as earlier small block Chevrolet engines and incorporated many similar external features and dimensions while being internally different. The 400 has gained notoriety -- with modifications -- as a powerful performance engine.

Physical Dimensions

• The 400 CID small block engine kept the same external dimensions as the other small block engines, but increased its displacement through internal modifications. The engine shares the same length, width and height as other SBCs at approximately 28 by 26 by 27 inches respectively. The identical external measurements made the 400 SBC readily interchangeable with other Chevy engines, such as the 350 CID small block engine, across many of the Chevy and GMC truck and Chevrolet car lines. Engine weight was also similar at about 575 pounds. This engine shared the same ignition system -- distributor, accessories and intake and exhaust systems as the smaller engines.

Internal Dimensions

• General Motors achieved the 400 SBC engine's displacement by increasing the bore to 4.125 inches and the crankshaft stroke to 3.75 inches -- actual displacement is just over 400.9 cubic inches. In contrast, the Chevy 350 CID engine uses a bore of 4.00 inches and a stroke of 3.48 inches. GM had to cast the block for the 400 CID engine differently to gain the extra displacement. To gain the extra 1/8-inch bore diameter, the cooling system water jackets between adjacent cylinders were eliminated on the 400 block. Additionally, GM designed the 400 crankshaft with larger main journals than the 350 -- 2.65 inches versus 2.45 inches. The connecting rods were also shorter than the others were -- 5.565 inches as opposed to 5.7 inches in the smaller engines. As a result of the short rod and 1/4 inch longer stroke, GM was required to use external crankshaft balancing on the flywheel/flexplate and harmonic balancer -- this is a shared characteristic of the 454 CID big block Chevy

Read more: Small Block Chevy 400 Specs | eHow.com

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