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

-
Slantsix64

Slantsix64

Well-Known Member
Joined
May 11, 2014
Messages
3,790
Reaction score
1,756
Location
Los Angeles
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.
Click to expand...
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.
Click to expand...
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.
Click to expand...
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?
Click to expand...
That’s the best I could get it with out pinging, running on 91 octane.
 
Pics

53BBD55B-78D4-4202-9E34-4372880CFC4E.jpeg


B68C989A-C169-43D3-9C8C-5D810ABDC777.jpeg
 
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.
Click to expand...
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?
Click to expand...
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
Click to expand...
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
Click to expand...
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....
Click to expand...
That could be some of it, if it's too lean. 185 is a good bit for sure.
 
You must log in or register to reply here.
-

Back
Top