pulled the engine and the cam broke just before the distributer gear.pain in the butt getting that little piece out of the end of the block.now i'm wondering if i should put my old flat tappet cam back in?the only thing is the valve springs are set-up for the roller.rooler closed seat pressure 132 lbs,flat tap 130,open flat 338 lbs,roller 414.just wondering if would hurt anything having 76 more lbs of seat pressure than is recommended?the flat tappet cam is the one b&m says to use with there blowers and the boat was faster with that one in.dave

they changed the part # on the 139741 now to a 139021 on the new cam spec card now they changed the spring pressure and changed the rpm range,do ya think they know they have a problem ?cam is going in today.

Apparently not, because I ordered the 021 and still got a black one! ....it went back - no thanks. As long as you got copper, you're ok it seems.

That cam is now part of thier "Z" series cams---supposed to have more area under the curve for more average power. I think they've just done a little marketing to capitalize on the latest needs of engine builders (that more avg power "under the curve" makes a stronger engine thatn a big dyno max hp #) by grabbing thier grinds that fit this bill and renaming them part of the Z-series. The grind # is basically the same.....soo.... me thinks it's just marketing...........

i'm going to put mine in anyway,over the winter i'll pull the engine again and go up one size bigger to the 139651 cause the 139741 just don't seem like it's any better than the flat tappet that b&m recommends for there supercharger's,cause i lost 2 mph going to the 741.dave

did anybody put there new 139741 cams in ???i found out today that the new 741 i put in is falling off over 5500 rpm's.just wondering if anybody else had this yet,the old 741 i could bring it up to 6000 rpm's and it still be pulling.thanks,dave

Wonder if that would be the result of diff timing on the cam??, were they both installed at the same degree, --"straight up" or 4 degrees ret/adv etc??...............................

I have a pair of 651 cams. Maybe 40 hrs or running time. Great condition and they are not black. I'll sell them real cheap.

both cams were installed straight-up.nothin different what so ever on my end.

PatriYacht,i would only need one cam,that's what i was going to do over the winter was put one of them in.what kinda rpm's do you run them at?how much is real cheap?

I know this is an old thread... but I'm looking for two 168731 CAMS if anyone knows where to find one. Need it ASAP. 8620 Copper Dipped Steel.

There is one guy that I know that maybe able to get you what you want you want. Send me an e-mail and I will forward it to him. If he can't get them then you won't get them because of what is going on.

[email protected]