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Old 05-23-2014, 05:35 PM   #1
Bassman/NZ
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Default Two 94s on an Offy Regular Dual?

There is a whole truckload of info about this on the interweb, but about a gazillion different opinions on jet size, PV, and I'd kinda like to hear from folks who have done this exact setup. 59A has milled heads, 3/4 cam, headers, and is in a fairly light AV8. Trying to get a definitive answer, I guess.
Jet size? Stock 51s?
PV? Stock?
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Old 05-23-2014, 05:43 PM   #2
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Default Re: Two 94s on an Offy Regular Dual?

I go with stock jet sizes initially and usually a 3.5 or 4.5 power valve.
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Old 05-23-2014, 08:42 PM   #3
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Default Re: Two 94s on an Offy Regular Dual?

What 3/4 cam is it?
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Old 05-23-2014, 09:02 PM   #4
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Default Re: Two 94s on an Offy Regular Dual?

Quote:
Originally Posted by lonewolf View Post
What 3/4 cam is it?
My question may be off, but what is a "3/4" cam anyways?

Jut a term, or an actual grind?
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Old 05-23-2014, 10:15 PM   #5
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Default Re: Two 94s on an Offy Regular Dual?

I'd get a copy of JWL's "Flathead facts" He covers this in detail, with dyno runs an most popular carbs and combinations. You might also find that putting spacers under the carb improves drivability among other things.
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Old 05-23-2014, 11:38 PM   #6
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Default Re: Two 94s on an Offy Regular Dual?

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I have JWL's wonderful book, but it doesn't answer my question.
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Old 05-23-2014, 11:50 PM   #7
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Default Re: Two 94s on an Offy Regular Dual?

race
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Old 05-24-2014, 05:14 AM   #8
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Default Re: Two 94s on an Offy Regular Dual?

If you re-read my book you will find that starting with stock 051 jets is a good play. You will also read that best power under the available atmospheric conditions during testing was with .048 jets. And, finally, you will be able to read about why the PV vacuum number will need to be lowered.
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Old 05-24-2014, 08:48 AM   #9
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Default Re: Two 94s on an Offy Regular Dual?

Quote:
Originally Posted by Mike B View Post
My question may be off, but what is a "3/4" cam anyways?

Jut a term, or an actual grind?
Not an actual grind persay, a term used to describe a type of grind, if you catch my drift. Stock then mild or 1/2 (race), then 3/4 (race) then full race then you just keep bunging "super" on the end. Super race, super super race and so on.
One companies 3/4 often differs substantially from another. Same with all types.
In essence the terms like 3/4 and full don't meen Jack. Hence an earlier poster asking what 3/4 cam.
Martin
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Old 05-24-2014, 10:00 AM   #10
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Default Re: Two 94s on an Offy Regular Dual?

Thanks Martin.
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Old 05-24-2014, 11:53 AM   #11
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Default Re: Two 94s on an Offy Regular Dual?

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Originally Posted by scooder View Post
Not an actual grind persay, a term used to describe a type of grind, if you catch my drift. Stock then mild or 1/2 (race), then 3/4 (race) then full race then you just keep bunging "super" on the end. Super race, super super race and so on.
One companies 3/4 often differs substantially from another. Same with all types.
In essence the terms like 3/4 and full don't meen Jack. Hence an earlier poster asking what 3/4 cam.
Martin

Thats why i asked what cam. I have a cam that i was told was a 3/4 cam that has 280 duration and 375 lift. I had to run a 3.5 pv.
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Old 05-24-2014, 03:08 PM   #12
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Default Re: Two 94s on an Offy Regular Dual?

If I remember correctly, I used 49 jets and 4.5 power valves in this. Fellow who mounted it has a non-stock cam (don't recall the specs). For a starting point, seemed to be right. Idles fine, goes to high idle without a hiccup, no black smoke. Caveat, it is still on a stand. His '32 Gov't. Motors coupe isn't quite ready for it, yet.


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Old 05-24-2014, 03:52 PM   #13
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Default Re: Two 94s on an Offy Regular Dual?

Quote:
Originally Posted by lonewolf View Post
Thats why i asked what cam. I have a cam that i was told was a 3/4 cam that has 280 duration and 375 lift. I had to run a 3.5 pv.
Yep, that be some big numbers for a 3/4 right there.
Those numbers usually would dictate a "full race" in most cam catalogs, but compare that to an Isky full race, the 88. Your "3/4" makes that "full race" 88, seam fairly tame.
What grind is your cam, just out of interest?
Martin.
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Old 05-24-2014, 03:54 PM   #14
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Default Re: Two 94s on an Offy Regular Dual?

52 Henry, there some purdy work on that setup. Swishy linkages and everythang.
Nice.
Martin.
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Old 05-24-2014, 04:55 PM   #15
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Default Re: Two 94s on an Offy Regular Dual?

Thanks, a lot of work, but enjoyable. I don't care for off the shelf stuff. I was hoping I could find someone else who didn't, and I did!
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Old 05-26-2014, 01:10 PM   #16
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Default Re: Two 94s on an Offy Regular Dual?

Quote:
Originally Posted by scooder View Post
Yep, that be some big numbers for a 3/4 right there.
Those numbers usually would dictate a "full race" in most cam catalogs, but compare that to an Isky full race, the 88. Your "3/4" makes that "full race" 88, seam fairly tame.
What grind is your cam, just out of interest?
Martin.
Potvin 3/8
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