From Ted Harbit: "The original R 1 and R 2 cam has about 224 degrees duration @ .050" with advertised or running duration of 260 degrees. The lobe lift is .2833" with gross valve lift of .425". Centerline installation is about 110 degrees. Lash is .024" hot. The R2+ (Harbit Grind) has about 229 degrees duration @ .050" and about 268 running. The lobe lift is .298" with gross valve lift of .447". You also gain some lift as the lash is set tighter (can be set as low as .010" but suggest starting at about .020" and if too much lifter noise, tighten a couple thousandths at a time until quiet enough to suit you. Most find .020" satisfactory. The .020" will give a little more idle vacuum." ------------------- r2 cam -. Intake opens BTDC 17, close ABDC 63, Duration 260, lift .400. Exhaust opens BTDC 56, closes ATDC 24, lift .400. Valve lash .025" ------------------ Another Studebaker cam spec for a CROWER E-32794 listed as a special Studebaker grind. 260 duration/.392 lift@.014 clearance intake opens 1.0 BTDC/closes at 33.0 ABDC exhaust opens 41.0 BBDC/closes at - 7.0 BTDC lobe separation 110 degrees (JDP -Nov 07) ------------------- See http://www.studebaker=info.org/Rseries/r3r4.html for R3/R4 Cam spec ------------------- The R3 and R4 had the same camshaft. If rump-rump is what is wanted, the R3 @ 278 degrees is the way to go I'll have to check some old catalogues to make sure there was not more than one Iskenderian E-4, but it was one of his milder street grinds, similar to Studebaker's R1 and certainly not "full-race." The specs I have are: Iskenderian E4 Rev-Master260 degrees advertised duration Hi-Rev series Hardenable iron lifters - #3002-H Intake opens 20 degrees BTC Intake closes 60 degrees ABC Exhaust opens 58 degrees BBC Exhaust closes 22 degrees ATC Net valve lift .410” Valve lash .022” (.015” for racing)