Any IQR 440 guys interested in a 440 HO bottom end converted to accept 600 cyl's? - HCS Snowmobile Forums

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Old 11-04-2017, 09:37 AM   #1 (permalink)
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Default Any IQR 440 guys interested in a 440 HO bottom end converted to accept 600 cyl's?

Add your cyl's and pistons. Piston skirts will need to be trimmed as this setup uses the 440HO short rod crank. I put a handful of these together and they run nice. Good durability for me as well.

I won't be using this. Or any other sled stuff soon. In Key Largo! Gone fishin soon for a stretch
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Old 07-27-2018, 06:38 PM   #2 (permalink)
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Originally Posted by moresnow View Post
Add your cyl's and pistons. Piston skirts will need to be trimmed as this setup uses the 440HO short rod crank. I put a handful of these together and they run nice. Good durability for me as well.

I won't be using this. Or any other sled stuff soon. In Key Largo! Gone fishin soon for a stretch<img src="https://www.hardcoresledder.com/forums/images/smilies/rolleyes.gif" border="0" alt="" title="" class="inlineimg" />
If you don't mind me asking how exactly is this done to the crank and what are the pros and cons I have a 05 Iqr 440 with a blown top end n just looking for ideas
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Old 07-30-2018, 11:17 AM   #3 (permalink)
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a look at the stickies above and you will find this from GOD AKA Tom


I'd like to confirm what others here are saying.

The 440 and 600 Small Block motors have the same stroke, even the earlier 440's and the 600HO have the same stroke. A 440 as early as '98 has the same stroke as an '07 600HO. During several model years from '98 to '07 the 440 shared the same crankshaft as other motors including the 440 and 550 Fan motors. The 440 and 600 never shared the same exact crankshaft. '04 through '07 440's share the same crank shaft.

The 440 has shorter connecting rods than the 600 SB, approximately 2.5mm shorter.

600HO and 600VES cylinders are not the same as each other, they are simular but not the same. The main difference is the HO Cyl has a wider Exhaust Valve Guillotine, a different transfer port design and different Cylinder Skirt design. I don't think it's possible to interchange an HO Cyl with a VES Cyl because of the different Cyl Skirt but with some modification it may work, its not something I have ever tried.

With proper machining 600 Cylinders (both HO and VES) will bolt on to a 440 case and work. The key is Proper Machining. Most Performance Shops do the machine work to the top of the case, that way if you damage a Cyl any stock 600 CYL will bolt on with no machining needed. The big shops like Carls Cycle, Larry Rugland MotorSports, Hot-to-Go, The Crank Shop, etc. have performed the 440 to 600 conversions many times and are very experienced at how much material to machine off the top of the upper case. The key is indexing the top of the piston to the bottom of the exhaust port for proper port timing. Approximately .100" needs to be removed from the upper case for proper port timing but every shop has their preferred specification so this varries from one shop to the next. Some shops take off more than .100" and some take off less.

Keep in mind when .100" is removed from the upper case the Exhaust port is lowered esentially .100" and a stock 600 exhaust pipe no longer fits perfectly.

When performed by one of the top engine builders a 440 to 600 converted motor can make lots of HP. Those shops have Dynos and the ability to have the CDI's reprogrammed, some even utilize the Variable Timing Selector Switch and the Solenoid Controlled Exhaust Valves for precise timing and EV control.

The biggest downfall to a 440 to 600 conversion is COST. This is usually not the cheapest way to get a 600 motor in your 440 chassis. By the time you have bought all the 600 Parts and paid for the machining you could have easily bought a used 600 motor in great condition.
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Old 07-30-2018, 12:10 PM   #4 (permalink)
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The wristpin diameter is also different on the 600 vs. 440.
The older 440s also use different reed valves.
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Old 01-19-2019, 06:04 PM   #5 (permalink)
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I've been gone a long time from this site. Interesting to see there were a few replies on my post. Altering the top case half on the '02 and newer 440 case is required to fit 600 ves or HO cylinders. The piston skirts will have to be trimmed as well. This case modification is really quite simple and any competent machinist can do it cheaply. No rocket science. I built several motors this way including 500 top ends, 600 top ends and the 660's. There really is no mystery in timing or fitting the original exhaust? Not sure where that info comes from! The wrist pin diameter is indeed the same as well. Another piece of confusing/incorrect info. These motors make good power and allow the continued use of the 440 ProX/HO bottom end. Really the only reason we started building them. I still have one of these based on a '03 440 ProX bottom with 600 ves cyl's. It runs very well. I have it in a Edge chassis with twin pipes as well. There is another one of these motors around the corner in a buddies sled. His is a 660 based on a '02 440 bottom end. It's been together since '03 or '04.
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Old 01-19-2019, 06:13 PM   #6 (permalink)
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So if I had a 440 iqr with a smoked top end. What exactly would be needed to do this job. And for it to fit in same chassis including what pipe , ignition, cyl , how much to machine off case top , how much to cut off piston skirts etc would be needed. Thanks

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Old 01-19-2019, 06:43 PM   #7 (permalink)
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Old 03-07-2019, 10:16 PM   #8 (permalink)
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moresnow, what do you do with the grease fitting on the pto end of the case, grease it or change to oil injection?
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