both are good places to buy the f-270. large scale would have shorter shipping time idly. they also have top end pull offs for about 40 bucks each. seems like the main bearings on not just the f-270, but lots of other engines do not last long, as they waste away, the evidence of this shows up as scraches on the cylinder walls. Running a stuffer crank will make the problen worse, less crankcase volume= less fuel mix to the bottom end bearings. I do not screw around with the stock bearings anymore. I run Nachi- C-6001 deep groove bearings, change the crank seals often. The Nachis are built to have some radial play. This is a +++ because of the less than perfectly aglined cranks we buy. These Nachies can be bought at VXB bearings in Califorina for about 5 bucks each. You can buy them most anywhere- but you will pay more $$.- Yep, the F-270 is a rev monster with pretty good midrange also due to tis 30mm rod. This engine has huge transfer ports. Ported jugs are spendy.- This piston you see could be worth a try- This is an e-bay seller with a 99.5% positive feedback, claims that if you break it- he will replace it. VXPerformance123. is the adress.- 49.95 = 9.00 shipping- additional items ship at the same cost in the same package-- up to a point- He is in Singapore.