Which TKO, .82 or .64? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-11-2010, 07:24 PM
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Which TKO, .82 or .64?

I'm planning on getting a TKO-600 for my '58 pickup project, & I'm deciding between the 2 final OD drive options. I'm looking for the best possible cruise MPG.

Here are the details of my truck:

* 58 Chev pickup, 3600 lbs
* 327 SBC, 10:1 c/r, Dart 180cc Pro1 heads, aprox 375 hp est
* Isky Mega 270 hyd cam, 221, dual plane, 1 5/8 headers, Edelbrock 600 carb
* 28" tires, 3.54 rear gears

O.D. Ratios:

0.82 = 2600 RPM @ 75 mph
0.64 = 2000 RPM @ 75 mph

I'm thinking the .64 OD may be too much for the 327. What do you guys think?

Thanks!

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Old 07-11-2010, 11:59 PM
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With that projected hp level I would go with the .82 and let the 327 breath a little out on the road. That '58 is a "barn door" going down the road at 75 so no reason to possibly lug the engine. That Isky is not a real fat cam but the engine will be near it's sweet spot at 2600, don't think you'll see too much more gas consumption with a 600 rpm difference.

My 331" sbc, Comp XE 262H. 218/224 dur. with a 700R4 (0.70) and a 3.89 rear will be at 2366 rpm @ 75......perfect.....I hope, good luck.
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Old 07-12-2010, 12:12 AM
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Thanks, I'm leaning toward the .82, I'm also thinking about putting a hyd roller cam in it, around 225* at 050
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Old 07-12-2010, 08:28 AM
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Thank God.

I get an awful lot of people who think they can run 3.08s and an OD...most times you just can't.

I recommend the .8 OD this will keep you from lugging the engine too hard, especially if you don't live in Kansas or FL.
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