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Cobrashoch made a good point about a stock block is all you need. My weight comparison was not between a stock block and an aluminum block. It was between a hi performance iron block (A460)

M-6010-A460* 10.322" Deck Height

Cast iron block with 4-bolt main caps on journals 2, 3, and 4

Nodular iron main caps

Can be bored/stroked to produce 598 cu. in.

Siamese cylinder bores

Bore range from 4.360-4.600"

Wet sump oiling design

3.000" main journal diameter

Weighs approximately 290 lbs.

High-strength block for professional competition (Circle Track, Drag Racing)


And an aluminum block with "almost" the same specs {can be bored out further)


M-6010-A96* 10.320" Deck Height
Heavy duty, light weight alternative to cast iron

356-T7 cast aluminum block with 4-bolt, steel billet main caps

4.625" maximum bore size

Siamese cylinder bores, 6.500" long

Finished main bores for standard 3.000" crankshaft journal bearings

Uses M-6261-A460 roller cam bearings

Weighs approximately 179 lbs.

Available from Raceparts Distribution, Inc. (704) 892-8688

NOTE: Siamese blocks are solid casting between the cylinder bores. There are no water passages between them.This is done to increase the strength of the block.


So if your comparing a stock 429/460 block with an aluminum, like Cobrashoch said, theres not much difference