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Old 05-19-2003, 06:17 AM
51'rodder's Avatar
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Post trying to get more torque

I have a chevy small block in my 51 Pontiac chieftain and a 308 rear end. I'm trying to get more torque and speed to help move the vessel. The thing is, is that I don't want to run the engine to high by putting a bigger gear in that is going to push the rpm's over the top.
With the exsisting gears in it now, I'm taching at about 2500 rpm at a highway speed of about 70mph.

I've been told two things. First, it was suggested that I put a 343 in it and that should give me plenty of push and tire smoking power. Second, I was told to put a 373 in to give me the same results... and then some, all without burning up my engine. It was stated to me that both would fit perfect with a chevy 350 small block.

Suggestion and comments very much appreciated. <img src="confused.gif" border="0">

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Old 05-19-2003, 06:41 AM
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With 3.43's you'll be running about 2800rpms at 70MPH, and that's plenty fine for a chevy 350. With 3.73's you'll still only be running just over 3000rpms which might start to hurt fuel economy a little if you do a lot of long runs, but still won't cause you any problems if the engine is in good condition and you keep up to date with your oil changes.

People run upto 4.11's on street chevy's but they are mainly weekend cars and drag racers.

That's my 2 cents.
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Old 05-19-2003, 03:23 PM
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Also, what kinda tranny your running? That seems like rather high rev's at highway speed for a set of 308 gears. And if your revs get too high, you could just add a taller set of tires...

heres a cool link to help you compute everything...

Good luck...<a href="http://www.mtv411.com/auto/Gear-Tire-Speed-Calculator.htm" target="_blank">Gear, Rear end calculator...</a>
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