when to change gen 6 chain?
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Well I have both sets of heads off on my 500efi,s, machine shop found only 1 broken inner spring with no damage done, I am having them make a surface cut, machine valves and seats and replace springs, my question is i have almost 200 hours on the motors when should I change the stock chain and gear set??
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Now would be the time, you have motor out. You can check for stretch in chain, but why not now, motor is out and its not much $$$. Do yourself a favor and degree your cam in.
Bawana
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the blocks are still in the boat, I pulled the heads for the valve job and was just going to reinstall them soon but was wondering about the chains, i know they are a single row chain on the gen6
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I would go with the Stock GM/ Mercruiser gear and chain set. No bother to degree the cam in on a stock 500EFI, no realized gains to be had. The stock set comes with the cam plate and new bolts as well. I have a GM part number of 12371053 for a Gen VI 502.
Dave
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there is not a big selection for the gen 6, i have a A Frame i can use to pull blocks out, was just wondering what everyone else was using for a chain and how much slack was in one with close to 200 hours
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At 200 hours, you'll probably have quite a bit of slack. Of course, if you had 20 hours you would have quite a bit of slack. The single rollers stretch quickly and then level out. I would recommend changing it to a double roller. Rollmaster has a true double roller with billet gears and a 9 keyway crank gear. It takes just a little clearancing of the cover while you have it off. There are some reinforcing ribs in the top half of the cover that have to be ground out. Not a big deal to do. The timing sets run a little over 100 bucks. The only other that I know of is Cloyes single roller. It is a 1/2" pitch chain, but still a single roller and is like $160. Give me a shout if you are interested in a couple sets. Hope this helps, Eddie.
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