Polaris SLP 654 - HCS Snowmobile Forums

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Old 02-15-2011, 09:52 AM   #1 (permalink)
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Default Polaris SLP 654

Picked up a 654 monoblock cylinder off ebay a month or so ago. Also found a set of powerdome heads, 0-5000 feet, for this cylinder.

Is SLP the only game in town for these pistons? They want about $140 a hole for pistons-rings-wrist pins. I was hoping to fill all three holes for less than $200.

Bore measures 68mm, with one oversize to 68.5.
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Old 02-16-2011, 09:56 AM   #2 (permalink)
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Not sure where you can find another source for pistons other than slp but if running that top end you really need to beef up the lower end for the extra hp. I think slp had a mod for beefing up the lower end. One of the guys here also had the crank pto pin welded also.
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Old 02-23-2011, 12:06 AM   #3 (permalink)
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All older 440 fans came stock with 68.25 with over bores, you can find the pistons on wiesco and SPI and iam pretty sure there the same or very simular as ive hear guys using the old fan cold pistons for cheap over bores. www.royaldistributing.com shows list on weisco and kimpex.
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Old 02-23-2011, 09:44 AM   #4 (permalink)
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Quote:
Originally Posted by firecat99 View Post
All older 440 fans came stock with 68.25 with over bores, you can find the pistons on wiesco and SPI and iam pretty sure there the same or very simular as ive hear guys using the old fan cold pistons for cheap over bores. www.royaldistributing.com shows list on weisco and kimpex.
Might be a chance ...you'd have to check if the wrist pin and bearings are the same size between the two.
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Old 02-23-2011, 04:34 PM   #5 (permalink)
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Look at the wrist pin location also. Distance from "top " of piston crown to wrist pin hole center line.
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Old 02-23-2011, 04:53 PM   #6 (permalink)
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Back in the day we use to build 440 and 660 motors out of the older fuji piston port 400 and 600 motors using the 432 single ring blower pistons. Pretty sure those pistons used bigger wrist pins and will not interchange with the newer piston port monoblock triples.
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Old 02-24-2011, 12:12 AM   #7 (permalink)
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Put up the triple wrist pin size i have a 488 pistons kicking around, I would tare my xlt motor apart but i just rebuilt it haha Ill find out the wrist pin size tho.
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Old 02-24-2011, 11:14 AM   #8 (permalink)
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Got my donor bottom end off ebay, 99 XLT motor. Off to a good start. I am either doing to take all this stuff over to IndySpecialty and have him figure it out, or send it to SLP. Definately going to 'big boy' the bottom, last thing I want is this thing giving me trouble out in ther middle of nowhere.
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Old 02-24-2011, 06:31 PM   #9 (permalink)
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Pretty penny for a guy that only wanted to spend $200 on the top end
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Old 02-25-2011, 09:54 AM   #10 (permalink)
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I spoke with our old motor builder last night and asked him a question about the wrist pins and bearings on those old mono block triples....he seems to remember the wrist pin rod bearings being the same but had to use different wrist pins for the larger pistons a 654 takes.
Told me also the oem cooling system on the xlt will not handle a 654 top end without some sort of aux cooler or additional nose cone rad.
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