575sci Head service
11-21-2009, 07:09 PM
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575sci Head service
Looking for info on the 300 hour head service... the hubby is curious what other people are doing... valve seals, springs? Or complete new valvetrain... any ideas?
11-21-2009, 09:02 PM
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I rebuilt a pair of 575SC's last winter with about 300 hours or so. I planned on replacing the springs, upgrade to 10* Titanium retainers and 10* locks. The surprise was the valves were starting to tulip, so ended up replacing all the valves. Before Crane went out of business, ended up replacing all the rockers as well.
11-21-2009, 10:48 PM
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At a minimum. replace the springs, retainers and locks(10* steel) and seals. I don't see a need to go to titanium retainers. The problem is the market is flooded with cheap import titanium retainers for around $200.Good titanium retainers will run $300+. You just won't see any benefit in a 575. It's just not worth the money. As far as the valves, that depends on how they look. As Vinny said, he replaced his because they were on their way out. Just wait to see what they look like. Hope this helps.
Eddie
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11-22-2009, 05:43 AM
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Eddie,
I agree, Titanium retainers on a hydraulic cam are not needed. However, after spending soooo much money on rebuilding everything else, I figured why not get Titanium. In any case, 10* locks are definately a good thing to add. Personally, I dont see why Merc ever used 7* locks.
I agree, Titanium retainers on a hydraulic cam are not needed. However, after spending soooo much money on rebuilding everything else, I figured why not get Titanium. In any case, 10* locks are definately a good thing to add. Personally, I dont see why Merc ever used 7* locks.
11-22-2009, 06:26 AM
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Thanks all for the info... thats what we are planning to do... plus blower service since they will be coming off... BTW, which are the better blowers...weiand or Holly? Our has holley stamped on the rear casing...
11-22-2009, 11:24 AM
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The earlier 575s had Wieands, which were slightly better than the B&M version. The difference being front and rear oil bath bearings. Only the front bearings are oil bath and the rear bearings are sealed on the B&M. Either way the bearings are prone to fail.
11-22-2009, 05:15 PM
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I could not agree more. You will never find 7* retainers in my shop. The point I was trying to make about the titanium retainers is to watch the imports. There are some cheap ones out there. It definitely can not hurt to go to titanium over steel, that's for sure.
Eddie
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