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No Replacement – Altered Bore Space Engine Platforms With CFE Racing

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#1 Bob Riebe

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Posted 17 June 2022 - 17:14



These are the first gents I read of making these types of engines a long time ago.

Back then the 5.20 was the latest greatest.


“There are two primary advantages to running a billet block over the standard cast design, the first being durability,” explains Kieffer. “The billet aluminum material is actually very elastic, it has an elongation (stretch before ultimate failure) of 25 to 30 percent. This allows the block and heads to flex to an extent, where as a cast piece is very rigid, and when exposed to the same environment as a billet block will fracture or crack much more easily.”



Top: A 6061-T6 billet aluminum engine block with a window punched in the side of it by a failed connecting rod. Bottom: A patch that will be welded in place to return the block to service. Photos courtesy of Miller Welders.

Edited by Bob Riebe, 17 June 2022 - 17:16.


#2 Greg Locock

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Posted 17 June 2022 - 23:54

30% ductility is very high for Al. 6061 T6 is less than 20%, T4 is 25%. That's why billet suspension bits (no welds) should be T4.