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Old 05-19-2005, 07:50 PM
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383 Red Line Opinions

I would like the opinion of experienced engine builders on this. I am just finishing my first 383 build using a 4-bolt, 5.7L/350, Vortec engine out of a '97 GM. Have used stock rods with an Eagle crankshaft and SpeedPro pistons. Rotating assembly balanced to 1/10 gram, competition valve job (valves radiused and unshrouded), Comp Cams (XE268H) with Comp Cams roller rockers, lifters and springs, etc.

Question is... with a properly balanced rotating assembly running stock rods... based upon user experiences with a 383... what is the safe operating red-line for this setup? Would 5,500 to 6,000 be an acceptable range.

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Old 05-19-2005, 08:02 PM
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6,000 redline with that setup? No sweat........
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Old 05-19-2005, 08:12 PM
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The Hyd. lifters are your limiting factor... but yeah you are safe.

Chris
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Old 05-21-2005, 02:35 PM
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Thanks guys. A little story on my build some of you may find amusing...

In anticipation of installing my new "high compression" engine several weeks before the engine swap I began filling up with 93 Octane gas. I completed the engine swap this week, had the engine set at 35 degrees advance total time. No ping in sight. Life was good.

Yesterday went to my local filling station (the only one in town that serves 93 octane) and found out that they had discontinued selling 93 octane due to the recent hikes in gasoline cost and the reduced demand for the more expensive 93 octane elixcer. Having no recouse I filled up with 91 octane and very shortly thereafter heard the tell tale signs of detonation.

After several hours of distributor adjustment with no luck in totally eliminating the pinging with a reasonalble amount of total advance, I comprimised by plugging of the distributor vacuum advance and the associated vacuum port on the Holley. Pinging is gone, engine feels right, and 91 octane is performing okay.

As I am not totally comfortable running the engine without any vacuum advance, I am considering ording an adjustable vacuum canister and retrofitting my new (Proform) distributor.

Anyone out there running straight mechanical on a SBC? If so, would appreciate your opinions on the timing/vacuum advance issue also.

Thanks in advance...

Will
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Old 05-21-2005, 03:29 PM
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Anyone out there running straight mechanical on a SBC?
all the time.
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