4.250 crank factory 340 block

6pkScamp said

No!!!!!! I'm having to redo my short block because the original builder said I didn't need them a girdle or anything else. Do it right the first time and spring for some four bolt caps.

No need to spin it past 6k. Mine was faster short shifting at 5800 than 6 or above

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What happened to yours? Why do you 'need' 4 bolt caps?

Retrofitting 4 bolt caps to a 2 bolt block is probably not worth the time or money and will never be as strong as a block designed with them already. Think about all the machine work involved and you're only getting an extra angled bolt on either side. If you need that much strength in a block, just save your coin for an aftermarket block.

To the O.P., what are the performance goals? What type of application? Street? Drag race? Power adder?