Formula934

iTrader: (4)

Im trying to decide which cam to go with here i know they have similar specs with the lift being slightly higher on Gm847. Ill be running a 100 shot too with stock heads and a tune after the Cam. Im going with a heavy duty valvetrain dual springs, hardened rods, etc and a stage 5 spec. Im torn between the two cams and i was wondering if the 847 needs to be revved higher than the 306 to achieve more power. Thanks for any insight

slowmofo

iTrader: (6)

Recommended RPM range with matching components
Minimum RPM 2800
Maximum RPM 6800
Valve Float 7200


right off the cam card for the 847 I rev mine to 6300-6400. Havn't dynoed the car though, but it seems to pull right up that

rebersole2

I use a CC306 and shift it at 6200- 6500 rpm's (I've spun it up to 7 grand a few times, but to no avail with these heads). I use stock iron heads with spring only upgrades, and it hasn't failed me yet. I went 12.01 on motor in the heat last season and an 11.42 on a 100 shot in November (still a sticky heated day). Just put a tune up on her last weekend and I think it's about time to get at it again. I'll see if I can't turn up the nitrous jets a little bit and get some better numbers.

daniel6718

iTrader: (36)

6 sped...i vote for 847...spit it to about 7000...shift around 6800

TransAm6383

iTrader: (1)

i second the 847..i Just sold my 306 and bought an 847 I was told by LE that it would make more power than the 306