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Going for walks, seeing some cool cars.

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I remember it being a big block. maybe more like a 400 , not a 396 I dont think.

This is a very good question.

The big-block Chevy series was the 396, 427 and 454.

The 400 Chevy was a stretched out small-block, which had siamesed cylinder walls, and was mainly offered as part of a towing package.

I could be wrong. ;)

Mike
 
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This is a very good question.

The big-block Chevy series was the 396, 427 and 454.

The 400 Chevy was a stretched out small-block, which had siamesed cylinder walls, and was mainly offered as part of a towing package.

I could be wrong. ;)

Mike

The Small Block 400 was plagued with overheating issues thanks to the siameased cylinders..... basically what that meant was there wasn't coolant flowing completely around each cylinder bore, and the middle cylinders on each bank ran incredibly hot due to the lack of cooling and also the valve layout in the heads..... both middle cylinders had exhaust valves right next to each other and that creates a hot spot all on it's own.

On to the Big Block..... 396, 427 & 454.

In 1970 the 396 became the 402, but was still called the 396 because it sounded so much cooler.

The reason it became a 402?? Well, in 1970 the EPA mandated stricter emission regulations on engines displacing less than 400 cubic inches. So, by increasing the bore of the 396 by .030" it changed the displacement to 402 cubic inches and not subject to the new regulations.