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BBM bore size

February 12 2018 at 10:07 AM
chillymerc  (Login chillymerc)

Response to Re: I’ll be running BBMs

I checked my BBMs at lunch, right at 4.200" nominal, some a smidge smaller but that's a safe measure. The FelPro 1020s I had on hand had a minimum .060" clearance to the chamber. So, looks like a 4.250 at .075 smaller could be very tight.

I'm not completely sure what the ring hanging in the chamber hurts as far as flow and turbulence, or more as far as reliability? Not sure it's worth too much hassle, it's just a street combo with an ancient tech shortblock.

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  • Tight - Marc H on Feb 12, 2018, 10:20 AM