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Old 09-29-2012, 06:18 AM
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1970 cevelle 4 door

I have purchased a 70 chevelle 4 door.I plan on doing some basic mods including a H/C/I,shift kit and a Saturday night special converter in the power glide.I am trying to decide on either 3.42 or 3.73 gears.The cam I am going to use is the Crane 274 ho6.I plan on using a Holley 570 street avenger carb and a Weiand street warrior intake.Heads are going to be a set of 416 heads.Of course I will have headers and a 2.25 dual exhaust with an x pipe and flows.I feel this will be plenty for the 77,000 mile 307.I am not building a race car,just a cruiser.

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Old 09-29-2012, 09:25 AM
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I think putting a turbo 350 with stock converter(or small stall if budget allows) would be a better investment over a stall in a glide and gears. Nothing wrong with a 307. Dont be shy on the exhaust,2 1/2 is better.The only thing I didnt like about the 307 is they had a nylon gear on the camshaft.New timing set with the new cam will fix that. Other than that,just treat that engine likes its an under sized 327.
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Old 09-29-2012, 10:25 AM
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Yea,I know a th350 is better ,but I just wanna see what I can do with what I got rather than changing a whole lot.I need hardened seats for unleaded fuel hence the 416 heads.The cam is just for the lope and I figure the other parts will compliment it.
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Old 09-29-2012, 10:40 AM
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the 3 speed by itself will improve the car the most.A bigger cam in a glide car with near stock gears and it wont make much difference. Did the stock heads fail you already because of unleaded fuel?
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Old 09-29-2012, 11:50 AM
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No,but isn't it a given esp. with the crappy fuel they charge an arm and leg for these days!!?
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Old 09-29-2012, 11:53 AM
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first gear turbo 350 2.52x3.07=7.7:1 launch gear

power glide 1st gear- 1.72x3.73=6.4 launch gear

spending money on gears and high stall will just cut your fuel economy. might even slow the car down?
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Old 09-29-2012, 12:12 PM
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I'm gonna crawl under the car and check te numbers to see wat ratio is in the diff.This car as working R134 converted a/c and I was told that pg cars with air have 3.36 gears.
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Old 09-29-2012, 12:35 PM
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not all diffs are tagged with the ratio.Tou might have to do a gear oil change to find out.3.36 is not a terrible ratio couple with a 3 speed,and even better with a 4 speed auto as they have a 3:1 first gear ratio.
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