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Old 07-24-2007, 03:14 PM
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383 with highway gears vs. 350

Although I've had fun building up the stock 307 in my '71 Chevelle, I'm feeling a need for more power. I was considering was a 383 with the factory highway gears. Some guys claim that a 383 with tall gears will outperform and out-mileage a 350 with a shorter gear. Any thoughts on this one?

I'm thinking something like this, but with vortec heads:

http://www.streetrodderweb.com/tech...erformance_383/


I currently have 2.73s and a TH 350. I've thought of converting to an 200 / 700 O/D, but could the 383 be a simpler solution?

Thanks guys.

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Old 07-24-2007, 03:22 PM
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Sorry, this is the link that should work.

http://www.streetrodderweb.com/tech/...rformance_383/
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Old 07-24-2007, 05:29 PM
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over on the 67-72 chevy trucks board (realy for all chevy trucks) there was a feller that had a 383 in a 76 iirc 2wd short bed automatic that got 21 on the highway .......less in town ....thinking something like 12 or 14
Shane
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Old 07-24-2007, 08:12 PM
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I won't argue with F-Bird about the 307 and Vortecs, I've never tried it but from my experience with 305's I bet it would get very good mileage and have plenty of power but I know of two different people with Vortec head 383's in full size pickups getting 21+ MPG. One has an '84 with a 700R4 and 2.73's and is running the old L-79 350 HP cam with a Quadra Jet on a Performer intake. The cam and 2.73's wouldn't be my first choice ( or 2nd or 3rd ) but it works for him. He says it will roast the tires any time he wants and averaged 21 MPG running 70 MPH on the interstate with an 800 Lb. load in the back. A good friend was with him on that trip and swears to it. The other is running the '395 Marine roller cam and 3.73's behind a 700R4 and says he gets 21 Hwy. MPG's no sweat in his '90 1/2 Ton. Put that combo in a much lighter Chevelle and you'd have a pretty nice ride.

If I can ever get out from under the daily drivers long enough I'm putting one together very similar to it for one of mine. I haven't decided if it will go in my Monte or my '89 C1500 Sportside yet. The Monte will have a 200-4R and 3.73's and the truck is a 5 speed with 3.42's. Wish I could build one for each of them..............
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Old 07-24-2007, 08:36 PM
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I have a '79 camaro with a 383 that has vortec heads, and a comp xe-262 camshaft, headers, and a performer rpm. It ran a 13.8 @ 106mph, with 2.41 gears in the differential and a wide ratio saginaw 4 speed, but I went through the traps in third. It is a very torquey motor! I suck at launching the car but I know I could run a much better time if I could control the traction.
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Old 07-25-2007, 10:01 AM
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Wow, thanks for the real-world examples. Looks like the 383 really can make up for a taller gear and still get good mpg! You think a 600 cfm carb will be enough on a mild setup?
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Old 07-25-2007, 03:08 PM
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On that engine in my example I'm running a 600cfm edelbrock (1406), it seems like its enough with that mild camshaft, but I havn't tried any other carb on it yet.

Also on that same engine I ran a 14.2 @ 95mph with exhaust manifolds and a single exhaust, I was able to launch it from 2000rpm and not spin the tires. Now I've added the headers and dual exhaust with an x-pipe, I can't get it to stop spinning the tires.
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Old 07-26-2007, 06:12 AM
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You might be surprised at what your 307 could do with a 200-4R and some 3.73's behind it.
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Old 07-26-2007, 12:10 PM
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Sounds nice, fiscus! I'd be that's fun on the street. Hippie, I've thought of the O/D option. I picked up a 7004R out of a 1990 Astro Van for $50 with like 200 miles on it (got it from my high school's auto teacher, he got the van donated for the kids to work on). I know I'll have to get the driveshaft cut and all that stuff, but you think it's worth all the hassle? Lockup or no lockup? How about a 7004R, 3.73s, and vortecs on the 307? Thanks again!
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Old 07-26-2007, 01:49 PM
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Quote:
Originally Posted by 307malibu
......O/D option. I picked up a 7004R out of a 1990 Astro Van for $50 with like 200 miles on it (got it from my high school's auto teacher, he got the van donated for the kids to work on). I know I'll have to get the driveshaft cut and all that stuff, but you think it's worth all the hassle? Lockup or no lockup? How about a 7004R, 3.73s, and vortecs on the 307? Thanks again!
Is it worth it? Absolutely!

Definitely lockup.

I like the gearing in the 200-4R better but if I got a deal like that on a 700 I'd sure use it, with the 3.73 gears and Vortec heads it should be a pretty decent runner and get good mileage too IF you keep your foot out of it. Later on you can build a 383 shortblock and use the Vortecs on it and you'll already have a good drivetrain behind it.
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Old 07-26-2007, 02:48 PM
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Will a stock 700R4 live behind a mild 383? Yeah, I know the 2004r has a better spread, but run what you brung in this case. With the short 1st gear of a 700 will 3.55s be a better choice? Thanks again!
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Old 07-26-2007, 08:34 PM
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A stock 700R4 or 4L60e will not live long behind a good 383. As for combinations I think the OD trans with 373's is a perfect combination.
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Old 07-26-2007, 08:48 PM
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a 700r4 doesnt hold upong behind a n/a 6.5 diesel
Shane
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Old 07-28-2007, 06:45 AM
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A 3.55 would work, you won't be in 1st very long either way.
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Old 08-04-2007, 04:58 PM
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I've got the 2004R, 3:73 and 305 Vortecs on my little 283. Its pretty fast, it keeps up with my buddy's Bel Air with a 350 in it. But the seat of the pants feeling isn't nearly the same. Both cars get about 20mpg highway, but his will do great burnouts, mine won't at all. His accelerates effortlessly from a stop while mine doesn't feel powerful at all. So I'm seriously considering replacing the nearly new 283 with a 350 or maybe even a 383. Maybe mine isn't tuned perfectly (too large 1 5/8 headers with too much exhaust duration cam causing over scavenging maybe, wasting gas?), but when I built this combo I expected to get better mileage than my buddy's Bel Air with the much bigger engine. Smaller engines aren't necessarily more fuel efficient in my experience.

Last month I got my very nice 55 Roadmaster (a very big car, much bigger and heavier than a Bel Air) on the road, with highway gears, TH350, no lockup, 350 SBC, old style heads, OEM intake and exhaust manifolds. This car also gets 20 mpg(!!) on the highway, fully loaded down with family and camping stuff to the max! Go figure...
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