THE CORVETTE 235 AND THE 261 USE THE SAME SOLID LIFTER CAMSHAFT. IT IS THE LARGEST CAMSHAFT CHEVY USED IN THESE ENGINES PERIOD.
THE M4F IS SLIGHTLY LARGER THAN THAT CAM, SO THAT MAKES IT AN UPGRADE TO ANY OTHER 235 OR 216 BY SIMPLE ARITHMATIC. PUTTING IT INTO A 'VETTE 235 OR A 261 WOULD BE A WASH, BUT NOT IN ANY OF THE OTHER ENGINES. IT WOULD BE LIKE BRINGING THE OTHERS UP TO 'VETTE SPECS, RIGHT?
GOING ANY LARGER THAN 260 DEGREES IN THESE ENGINES WILL REQUIRE ATTENTION TO TRANNY AND REAREND GEARING, AS THESE CAMSHAFTS LOOSE SOME OFF THE LINE TORQUE. ACTUALLY TALKING TO SOMEBODY WHO HAS USED THESE CAMSHAFTS AND WHAT THEY USED FOR GEARING, ETC... AND FINDING OUT HOW WELL IT PERFORMS IS THE ONLY SURE WAY TO GET AN IDEA IF THAT COMBINATION IS RIGHT FOR YOU INSTEAD OF LISTENING TO SOMEONE GUESS ABOUT SOMETHING THEY HAVE NEVER DEALT WITH.
SO, IF BY YOUR OWN ADMISSION THE F-290 AND F-298 ARE TOO BIG FOR THE APPLICATION, THEN WHAT DO YOU SUGGEST? HMMM, LETS SEE... I GUESS THAT LEAVES US WITH THE M4F OR SIMILAR CAMSHAFT PROFILE, DOESN'T IT?
