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Old 06-26-2004, 10:26 PM
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low rpm high torque

I want to build a low rpm high torque 350 for a Chevy 4x4.
Some daily diving and weekend mudding.
Ive got a 350 4 bolt main block bored 60 over, stock heads and crank.
Any suggestion. THANK YOU.

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Old 06-26-2004, 10:59 PM
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You could try the Edelbrock Performer cam since your useing stock heads, or maybee the EX262 from comp cams.
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Old 06-26-2004, 11:26 PM
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Get a cam with a wide lobe sep. 112o or 114o. Keep the duration under 230o @.050".

A 400 would be the best way to get what you are looking for. I would sell the 350 and get a 400 block.

You could also stroke it to a 383. Maybe just sell your crank.

If you aren't willing to sell anything, go with a set of Vortec heads, and an Vortec style RPM Air Gap manifold. Some people seem to want to believe that the Performer makes more low end torque. Every dyno test I have seen in magazines proves that the Air Gap makes more power and torque at lower RPMs and upper RPMs.
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Old 06-27-2004, 08:14 AM
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low rpm high torque

what piston should i uses
IF i want to stroke it can i use my stock rods and what kind of machine work will i have to have done.

thank you for the other information.
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Old 06-27-2004, 09:03 AM
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FOr the same duration a tight lobe seperation will make more torque but in a narrower band. The wider lobe seperation will extend the powerband a little higher for a wider band and give a better idle at the cost of some torque. Usually 110 degree lobe seperation is a happy medium between most torque and acceptable idle for the street.
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Old 07-05-2004, 03:29 PM
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Hello,
So would 106 lobe seperation be tight?

Thanks
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Old 07-05-2004, 08:17 PM
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Trust me I've built a 4x4 fullsize before, and you're going to want more than 360 cubes.

Get the 400, you'll be money ahead-

K
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Old 07-06-2004, 06:06 PM
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Id opt for as many cubes as you can get. The longer stroke of a 383/400 should make at least 30-40 ft.lbs over the same combo in a 350. But if you cant go bigger than a 350, it will still make decent torque.

I'd go with a cam in the 206-214 duration @ .050 range for a 350, up to a 220 @ .050 for a 383/400. Id want at least 9:1 CR too.

Combine that with a set of decent heads that have good velocity/swirl and a conservative intake runner size of around 165-170. Vortecs, Dart 165's, Edelbrock 170s, world torquers, etc would all be good choices. If you must use stock heads, hope they are one of the better castings.


Dual plane manifold with a good 600-650 carb and 1 5/8 headers and you should have a good, flat torque curve.

Hope this helps
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Old 07-07-2004, 12:41 AM
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I run a 400 with high compression and a cam with a 114o lobe sep.. It has a nice flat torque curve that stays above 400 ft./lbs. from 2,000 RPMs up. It gets about 13-15 mpg and idles very smooth.

Quote:
Originally posted by sb72elcamino350
Hello,
So would 106 lobe seperation be tight?

Thanks
If the lobes are 106o apart, it would be safe to say they are tighter than lobes that are 112o or 114o apart.
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Old 07-09-2004, 11:44 PM
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i'd say the easiest way to get low rpm torque would be by using a caddy 425-475-500. unbelievable stock numbers. there cheap, pretty easy to find and can be built cheaper up to around 500 horse than any chevy. if you could find a 1970 500 you would have all of the torque you need-over 500ft. lbs stock. you can use your chevy tranny with the help of an adapter. i'm new to the caddy swap game but i'm a believer. i'm putting a 472 into my '67 chevy short bed, should have it all done before the end of this summer. search around the net for caddy info if you're interested, there are a few aftermarket companies also. i'm not saying i'm an expert on caddy's, because , boy i'm far from it, but its worth a ponder. David Harroald
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