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What is the best thing to do with tired 575's?

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Old 11-13-2007, 11:18 PM
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What hours are on these 575's?
300+ hard hours
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Old 11-13-2007, 11:28 PM
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I had mine rebuilt and loved the outcome. Bored them out to 509 blocks. Went with a hydraulic cam and Morel hydraulic lifters. Changed the fireing order.
Why did you change the firing order?

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Old 11-13-2007, 11:42 PM
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Two of the cylinders fire so close together that one of them is prone to run lean. Not a good thing for blower motors. The mechanic that rebuilt my engines recommened that I let him do this.
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Old 11-14-2007, 12:03 AM
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Why did you change the firing order?

Michael
7-4 swap on big blocks will amke bigger power. You need a cam designed for it.
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Old 11-14-2007, 01:17 AM
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Contact Dean Gellner at Gellner Engineering in Parma, Ohio he has done a lot of 575's upgrades and is a great Motor Builder.
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Old 11-14-2007, 07:31 AM
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[QUOTE=Quiet Storm;2334853]I had mine rebuilt and loved the outcome. Bored them out to 509 blocks. Went with a hydraulic cam and Morel hydraulic lifters. Changed the fireing order. Reworked the heads. Went with MSD ignition. Arizona Speed reprogramed the ECM's. The Blower Shop rebuilt the blowers. They can make the blowers stronger but I wouldn't run them for much more than 200 hours before rebuilding, depending on how you drive it. I picked up 150 hp without intercoolers. I could have got more hp out of them with the intercoolers but wanted reliability.

If you look up 10X he can tell you more about them. He helped rebuild them.[/

What was the firing order and what did you change it too. ?
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Old 11-14-2007, 07:42 AM
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I would think an intercooler adds reliability.
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Old 11-14-2007, 08:32 AM
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Send them to Gellner and tell him to do the same as he did to mine you'll be amazed at the diferance.
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Old 11-14-2007, 09:15 AM
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[QUOTE=JoeD;2335188]
Quote:
Originally Posted by Quiet Storm View Post
I had mine rebuilt and loved the outcome. Bored them out to 509 blocks. Went with a hydraulic cam and Morel hydraulic lifters. Changed the fireing order. Reworked the heads. Went with MSD ignition. Arizona Speed reprogramed the ECM's. The Blower Shop rebuilt the blowers. They can make the blowers stronger but I wouldn't run them for much more than 200 hours before rebuilding, depending on how you drive it. I picked up 150 hp without intercoolers. I could have got more hp out of them with the intercoolers but wanted reliability.

If you look up 10X he can tell you more about them. He helped rebuild them.[/

What was the firing order and what did you change it too. ?
1-8-4-3-6-5-7-2 is a standard Chevy firing order.

Last edited by Knot 4 Me; 11-14-2007 at 09:19 AM.
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Old 11-14-2007, 09:35 AM
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I got a friend with a 42 Lightning with "tired" 575's trying to figure out what to do with them. He has never been thrilled with them and is at a crossroads whether to rebuild or replace. Any ideas?
Deep Six! Fish Condo!!
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