Blowsion 850 sleeve hpe 4 mil

T

te4250

Location
Western NY
I did alot of searching on this at one point, never ran it myself though. I think basically what people say is its a ton of work and in the end not worth it unless you can do all the machine work yourself and have the spare time. But you need a 62t/64x cylinder, you will have to bore then port match it to the sleeves, get a superbore headshell and domes, or modify a stock 62t head. I believe the pistons blowsion sells are actually cr500 pistons with a different compression height than the 701, so you need to space your cylinder/recess your head depending on the port timing you want. I think you also need to bore your cases for the big bore sleeve, and probably need to epoxy and port your cases to feed the bigger displacement. With a 4mm crank the cases shouldn't need to be trenched. blowsion says the porting works well up to a 6mm stroker, I dont remember if I found actual specs for the blowsion sleeve but between the cylinder, head, and apparently large flange on the top of the blowsion sleeve I think you can play around with timing quite a bit. There's probably no reason not to do the 4mm stroker if you do the 850 sleeves though because you need to move your cylinder around anyway so might as well go for the stroker crank. At this size bore though I think you start eating into your transfer ports alot and iirc theres not much room to bring them out. The consensus I kept finding was there's just better, cheaper options in the end.
 
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