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Super Stock / Pro Street and Modified Discussion 55-56-57 Super Stock / Pro Street and Modified Discussion 55-56-57 Talk engines, race tracks , setup's etc

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Old 10-16-2019, 10:36 AM   #11
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So maybe better get cam and carb together? Cam does sound good.. I haven't paid attention to mileage.. Still working out some kinks..just Put in a 700r4... Slowly getting them worked out.. Thanks
So, what carburetor do you have on there now?
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Old 10-16-2019, 10:58 AM   #12
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If its a speeder get a 3310-1 Holley and a Duntov 30-30, no use for Thumper Cams.
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Old 10-16-2019, 11:13 AM   #13
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It's an Edelbrock 1406 do believe..Big stall converter.. It does cruise down road pretty good it seems.. Just re timed it..But haven't got out on road since have done that (road washed out and car sits lower) stock rears (was 6 cylinder car) re do rear end next year I think.. Thanks again for replys and questions.. I do like to research and opinions help a lot on where to start
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Old 10-16-2019, 11:38 AM   #14
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Like Pops suggested.Edelbrock AVS2.I just put one on and am very happy.Ran right out of the box and very easy to tune.Also buy the tuning kit and you will be set.
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Old 10-16-2019, 12:16 PM   #15
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The formula for calculating how much CFM (cubic feet per minute) your engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456. I'd use 85% on the VE.
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Old 10-16-2019, 01:48 PM   #16
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It's an Edelbrock 1406 do believe..Big stall converter.. It does cruise down road pretty good it seems.. Just re timed it..But haven't got out on road since have done that (road washed out and car sits lower) stock rears (was 6 cylinder car) re do rear end next year I think.. Thanks again for replys and questions.. I do like to research and opinions help a lot on where to start
It doesn't answer your question, but the factory rear end ratio was determined by the transmission, not the engine. Of course it could have been changed a few times since it was new.
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Old 10-16-2019, 07:17 PM   #17
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That's kinda why was asking.. I've used a formula found on line.. Which was quite a bit less than what's on car now.. Figured cam had something to do with that..On the web you get lot's of reading with different answers.. That's why asked here..More feedback...And yep.. Not sure what was thinking on rear gear ratio..Do believe a 3:55... But probably change at some point anyway
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Old 10-16-2019, 11:35 PM   #18
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Any 650-800 cfm carb if correctly set up will work with your combination.

The Edelbrock 1406 you have is as good a choice as any unless the one you have is defective in some way.

I had a 1406 on a similar engine with less cam and less converter and had to increase the accelerator pump nozzle size. A higher stall converter may decrease the need for that.

I have had problems with Holleys idling correctly in recent years but I don't know if they all do.

I read all this stuff about the Edelbrock AVS carbs being so much better but there is no good reason for them to be unless they are just screwing up their other offerings. A puzzle to me.
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Old 10-17-2019, 11:07 AM   #19
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"just Put in a 700r4".
A good choice w/ that loose converter. The lockup converter will help w/ trans fluid heat.
Cruise rpm, that's lower than stall speed, tends to create a lot of heat. BTDT.
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Old 10-17-2019, 11:50 AM   #20
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My pick would be a 650 Holley with vacuum secondaries. You could probably even get by with a 600. I'd also pick a different cam. I believe those thumpers are ground to sound radical but not really be radical. I'd want one that was ground to be the best match for my engine, car weight, cruise rpm, etc at let the sound fall wherever it may. Your car will be peppier and spend less time at a gas pump as a result.
Yes, that Thumper cam they claim the power range is 2000-5800 rpm. With overdrive you may not always get to that 2000 rpm. You might consider swapping out for a cam that has a starting power range in the 800-1200 rpm range. It won't sound cool, but it'll be more responsive at lower driving speeds. And get one with 112 degrees of lobe separation, you'll get better vacuum for power brakes.
This, of course is based on the assumption you're building a cruiser, not a 1/4 mile car.
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