R2 vs R3 supercharger Performance

[R5335]

Is there a difference between a R2 supercharger vs an R3 supercharger as far as performance? The obvious is the air box on top of the carburetor so because of that, I was curious if therefore there is a difference between them. Also, where on the supercharge can I find the model number/part number? Only thing I've found is "MS 2380".  The air box on my car looks like an R3 and has a casting #/part # on the top of 1558946.  My car that I just purchased has been modified over the years. The block number is a standard 289 cu inch with the casting # of 1554641. The heads are from a "golden hawk" with a casting number of 535976. The intake manifold has a casting # of 1557144. I'm still going over the engine and transmission looking for casting #'s/part #'s. The transmission has been replaced with a chevy 700 4R. 

[mfg]

Same supercharger…. Performance pulleys we’re optional for higher impeller speeds.

[mfg]

“2380” is the serial or production number of supercharger… “MS” means it was destined to be installed on a Stude Avanti…ML indicated the supercharger was destined for installation on a Stude Lark or Hawk.

[mfg]

Only real differences between a type ‘MS’ and type ‘ML’ Paxton SN supercharger is position of the scroll housing (clocking), and the two different types of  supercharger drive pulleys….Also, the three drilled and tapped  supercharger mounting holes located in the bearing housing are in different positions.

[R5335]

Thank you for that quick reply. So to add to this question or next question. Is there a difference between a R2 intake manifold vs a R3 intake manifold? What I've noticed is that with the R3 air box, the air box is slightly rubbing up against the bottom of the hood. The insulation on the underside of the hood has already been removed, I presume because it wouldn't close with this air box. Even still, there is a slight rub.

[mfg]

49 minutes ago, R5335 said:

Thank you for that quick reply. So to add to this question or next question. Is there a difference between a R2 intake manifold vs a R3 intake manifold? What I've noticed is that with the R3 air box, the air box is slightly rubbing up against the bottom of the hood. The insulation on the underside of the hood has already been removed, I presume because it wouldn't close with this air box. Even still, there is a slight rub.

Well, besides being made out of aluminum as opposed to cast iron, the R3 manifold has much bigger intake ports which correspond to matching bigger ports in authentic R3 Stude V8 heads.

Thinner front engine mount biscuits, which may help your hood clearance issue, are available from Stude parts suppliers.

PS… I’m not sure if there is any overall height difference between the two intake manifolds.

[R5335]

Thank you mfg. I've been on the road so I hadn't had a chance to respond. Good info though and I was thinking about those engine mounts as a fix