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Old 02-05-2005, 10:26 AM
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highway RPM

I have a GM 350/350 combo in a 2300 lb car with 4:55 rear end gearing.

Is there some "rule of thumb" of what highway speed I can maintain with the above combo and not "fry" the engine.

The gearing is OK for Show n Shines around town but once in awhile I might want to venture 100 miles away.

Your imput greatly appreciated

Al

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Old 02-05-2005, 10:45 AM
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Do you have a transmission cooler(seperate from your radiator)?What kind of car do you have that weighs 2300 lbs?My little nova weighs 2900lbs.
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Old 02-05-2005, 10:48 AM
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Run synthetic oils With extra capacity pans!
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Old 02-05-2005, 11:34 AM
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engine rpm

Thanks for the replys.

Do have a separate trans oil cooler.

Also run two radiators. Have one under the trunk where the gas tank was mounted. Run a Lincoln two speed fan...2500 cfm and 4000 cfm

Car is a 58 Volvo 444

What would be max suggested rpm for highway travel?

Thanks again

Al
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Old 02-05-2005, 01:19 PM
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deffinitely want to keep it below 6000
and probably closer to 5500 for sustained runs, but it really all depends on the quality of the valve train, and con rod bolts
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Old 02-05-2005, 03:15 PM
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trans cooler

a transmission cooler probably wouldnt be a bad idea either. and even a trans. temp gauge.
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Old 02-05-2005, 03:17 PM
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Nice to see another Volvo man on the board... sure do miss mine
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Old 02-05-2005, 07:28 PM
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From my experience, at the RPM it would take to stay with traffic on the interstate with 455 gears the engine will not live very long.

4:11 in my elcamino 350 was too much, 4800 rpm. With the overdrive now it's not to bad.

Troy
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Old 02-05-2005, 10:54 PM
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you could put a 200-4r in there and it should fit right up
same drive shaft length and all
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Old 02-06-2005, 05:53 AM
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??? for highway have a second pair of as tall as possible rear wheels and tires. Swap to your show wheels when you get there.

mph/rpm/tire size calculators are in the hot rodding basics section.
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