557 '' Mopar Cam

[JOHNNY MOPAR]

CURRENTLY RUNNING THE 509 HYDRAULIC PURPLE CAM IN MY 360 , HAVE JUST PURCHASED THE 557 SOLID PURPLE CAM , ENGINE HASN'T DONE MUCH WORK , GOING TOO FRESHEN HER UP NEW RINGS AND BEARINGS , MAIN STUD KIT , MILODIN WIDAGE TRAY , MOPAR THIN SHIM GASKETS , WITH HYDRAULIC CAM ENGINE MADE 282 RWHP AND RAN A 13.05 @ 108 MPH IN A 3000 LB AUSSIE VALIANT , ENGINE SPECS ARE 30 THOU OVER , DECKED 20 THOU , UNPORTED EDELBROCK ALLOYS , MILIDON BAFFLED SUMP , MELLING HI VOLUME PUMP , M1 MANIFOLD , 750 DP HOLLEY , PROCOMP ELECTRONIC DISSY , BLOCK HUGGER HEADERS 1/58 , DONT MAKE BIG PIPES FOR PRE 67 CARS HERE IN AUSTRALIA , 904 STAGE 2 SHIFT KIT 3500 STALL AND 3.7;1 GEARS , PISTONS ARE DOWN THE HOLE A BIT , THINKING I WILL NEED A BIT MORE COMPRESSION , WANT TOO STAY WITH THE PISTONS I HAVE AS THEY HAVNT DONE MUCH WORK , SHOULD I DECK THE BLOCK A LITTLE MORE AND MAYBE SKIM THE HEADS ?, AND WHAT PUSHRODS SHOULD I RUN WITH THE SOLID CAM , WILL BE RUNNING ROLLER ROCKERS OBVIOUSLY 1.5 , ANY HELP WOULD BE GREATLY APPRECIATED , AND HOW MUCH HORSEPOWER DO YOU GUYS THINK I WILL PICK UP , CHEERS , JOHNNY MOPAR

 

[Bigdummy]

Get more port work on the heads

 

[JoeDust451]

Before you do anything, i would work on the suspention & get those ETs down in the mid 12s where they should be with that 108 trap speed, i've gone 12.4s at 108, i've seen 12.2s at 108, theres a good 3/4 second in that car, those 3.71s aren't the best gear for a SB thats modded, at least a 4.30, or even a 4.56, you can keep adding HP, but if the car doesn't 60ft., its all a waiste, just my opinion.

 

[1wild&crazyguy]

Good cam, better than the .509, broader torque curve, faster ramps, kinda idles the same or better and is only .521/.525 after lash with more rpm stability. jmo

as in if you can rev more you can=make more power, use more gear lower your ET

 

[JOHNNY MOPAR]

Thanks Joe Does Make Sense , Car Has Chassis Rail Connectors , 6 Cyl Torsion Bars , Good Shocks As Well , Car Has Done A Lot Of Slow 2.01 - 2.05, But It Has Done 1 - 1.9 60 F/t , Would Like To Go Down To 4:11 Gears Still Want Driveability . . .

 

[JoeDust451]

Thanks Joe Does Make Sense , Car Has Chassis Rail Connectors , 6 Cyl Torsion Bars , Good Shocks As Well , Car Has Done A Lot Of Slow 2.01 - 2.05, But It Has Done 1 - 1.9 60 F/t , Would Like To Go Down To 4:11 Gears Still Want Driveability . . .

2.0 is bad, but i understand driveability, it really comes down to what you want from the car, like wild said, the .557 solid will have better manners over the .509, but i don't think you'll see much ET gain to justify the aggravation of changing things over, if you keep working & dialing in the tune, that .509 will have decent street manners as well, i've run a few of em & really liked them, even though there an older design.