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Chevy 350 HO Crate Engine Fuel?

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Old 05-07-2008, 09:48 PM
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Default Chevy 350 HO Crate Engine Fuel?

In 2000 I put a new 350HO in a 20' Imperial cuddy cabin. The engine has been flawless every season. It does call for 92 octane. I have used mostly 89 and some small amounts of 87 and really don't notice a big difference. With fuel cost at these levels, what would running 87 do to the engine? At this point I certainly don't want to compromise anything. I was just curious to hear from a good engine person out there.

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Tom
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Old 05-07-2008, 09:58 PM
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Boat motors run at maximum load coming on to plane and accelerating, the very small amount you save with 87 octane may well cost you a burnt or dropped valve or even a broken piston due to detonation.

I would stick with at least 89

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Old 05-07-2008, 10:12 PM
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Once I was filling up the scarab with premium and got a 4 hour dissertation on why I shouldn't use it. I'd go with what the mfgr says at the least.
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Old 05-07-2008, 10:57 PM
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Quote:
Originally Posted by hunster View Post
Once I was filling up the scarab with premium and got a 4 hour dissertation on why I shouldn't use it. I'd go with what the mfgr says at the least.
a 350HO isn't a boat motor, that I know of. Sounds like a GM crate motor
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Old 05-08-2008, 01:37 AM
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You will destroy that motor if you continue to run it under a load with 87 octane,it was built to run on 92. I had one in a 1/2 ton truck a few years ago,if a gas station lied about their octane it would spark knock and rattle hard. It would rattle on 89 also,your problem is you'll never hear the detonation in a boat,it will just crack one of its hyperutectic pistons and come apart. I broke a piston at 22,000 miles on mine,switched them to forged,luckily the skirt that broke just made a constant ratlle and moved up and down with the piston instead of ending up wrapped around the crankshaft,Smitty
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