440 JLO/Rockwell Cuyuna - Amphibious ATV Pictures

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440 JLO/Rockwell Cuyuna

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jpswift1 6x6 World Sponsor Registered: June 2007 Location: Buffalo, NY Posts: 6,442	Here's the power plant going in my Attex racer. It originally started out as a 400 JLO/Rockwell out of a Attex 400 Chief. I got some 440 5 port perfrormance cylinder jugs from Hydromike that bolted right onto the 400 bottom end. The engine has just been bored out and a pair of Wiseco performance pistons were installed.
	· Date: Fri October 19, 2007 · Views: 4,301 · Filesize: 160.7kb ·
	Additional Info
	Rating: 10.00
	Keywords: 440 JLO Rockwell Cuyuna
	Linked Thumbnail: <--Copy this code into your post to display the picture

Wed October 29, 2008 4:49pm

Rating: 10.00

jeffery9076

Master Mudder

Registered: September 2008
Location: woodland pa
Posts: 534

how many ponys is it cranking about 41 or more i guess

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Sat January 24, 2009 4:18pm

jpswift1

6x6 World Sponsor

Registered: June 2007
Location: Buffalo, NY
Posts: 6,442

I think you're right in the ballpark with that guess. When I saw a vintage AATV brochure with the statistics on the 440 JLO engine option (I believe it was Max) they were rated at 42 hp. I just put a slightly larger Mikuni carb on it, and had it bored out and put some Wiesco pistons so we'll see how it does. I'm hoping it should move my first generation Attex racer pretty well.

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