Guess this Lift and Duration n this mystery Camshaft!!!

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Slantsix64

Slantsix64

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What do you guys think? Bought this 340 used years ago no idea what camshaft is in it!

 
Slantsix64 said:
That’s the most the motor will take and like I got the mechanical at set at 10 degrees inside the distributor and initial at 18 degrees.
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Small blocks usually end up with around 34-36 degrees total. You're still low. UNLESS you're speaking in distributor degrees. I never do that. I always talk crank degrees. What's the total at the CRANK?
 
RustyRatRod said:
Idles too smooth.
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I know it is a Mopar purple camshaft that’s all the info I have, I had a picture of the part number when I pulled the motor apart to put a new timing chain on it, let me see if I can find it. The engine came out of a challenger, date code is 68 so probably was swapped in some time ago.
 
Slantsix64 said:
I know it is a Mopar purple camshaft that’s all the info I have, I had a picture of the part number when I pulled the motor apart to put a new timing chain on it, let me see if I can find it. The engine came out of a challenger, date code is 68 so probably was swapped in some time ago.
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I would guess it's either the 474 or the 484. The 508 idles ROUGH.
 
RustyRatRod said:
Small blocks usually end up with around 34-36 degrees total. You're still low. UNLESS you're speaking in distributor degrees. I never do that. I always talk crank degrees. What's the total at the CRANK?
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That’s the best I could get it with out pinging, running on 91 octane.
 
Pics

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Slantsix64 said:
Oh ahahah my bad I got too excited, 18 initial checked at the balancer, and 10 locked in the distributor with the limiter plate, 28 total no Vacuum advance.
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Ok, and this is measured at the CRANK with the timing light, correct? So it's 28 total at what RPM?
 
RustyRatRod said:
Ok, and this is measured at the CRANK with the timing light, correct? So it's 28 total at what RPM?
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Yeah with a timing light, the total I believe was set at 2600-2800 Rpms I have to find the curve specs, had it on a paper they gave me when I got the distributor recurved. I know it has a stock medium spring and a super light mr. Gasket spring. Some combo like this
 
Slantsix64 said:
Yeah with a timing light, the total I believe was set at 2600-2800 Rpms I have to find the curve specs, had it on a paper they gave me when I got the distributor recurved. I know it has a stock medium spring and a super light mr. Gasket spring. Some combo like this
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Evidently you have a lot of compression?
 
Slantsix64 said:
Yeah with a timing light, the total I believe was set at 2600-2800 Rpms I have to find the curve specs, had it on a paper they gave me when I got the distributor recurved. I know it has a stock medium spring and a super light mr. Gasket spring. Some combo like this
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That sounds about like my go to curve. A light and medium spring is what I normally start with and most times end up with.
 
Planning on putting some tube headers on it and a double pumper on it, currently has a 73 340 driver side manifold, and dakota passenger

And a 1405 600cfm edelbrock, the damn thing runs pretty good under carbed but I know I’m missing some top end though....
 
Slantsix64 said:
Planning on putting some tube headers on it and a double pumper on it, currently has a 73 340 driver side manifold, and dakota passenger

And a 1405 600cfm edelbrock, the damn thing runs pretty good under carbed but I know I’m missing some top end though....
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That could be some of it, if it's too lean. 185 is a good bit for sure.
 
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