fastlane40

Will the following cam increase HP in a Gen V 502 465hp crate motor with a 871 blower or is it best left as is?Merc part 485-816709.Used in the 500 Bulldogs.
Intake lobe H240/329,
300*@.0042
240*@.050
148*@.200
.559"lift@ 1.7
Ex lobe H250/340
310*@.0042
250*@.050
158*@.200
.578"lift @ 1.7.
Also will a Gen IV 525 SC cam fit a Gen V?
Any help greatly greatly appreciated.

GPM

The cams will interchange, you will need adjustable rockers, and check the clearence between the retainers and guide. Probably a better spring to match the cam. I like the bigger cams, I would run a 112 lobe separation for blower application, I would degree it in at 108 center.

fastlane40

Do you think the 500 Bulldog cam would be a benefit?This cam was used between 1990-94.Is that Gen V?

GPM

I don't use any factory cams, I believe the Gen V motor was introduced in 1995. I would look for a cam with the biggest .200 numbers staying with your .050 numbers it would make the most power.

Brad

I had stock cams in two 465's put Weiand 177 blowers with 31/2 lbs on them and both camshafts broke!

Comanche3Six

Crane Part Number: 139741 Grind Number: HR-296-2S-12 IG
Engine Identification:
Start Yr. End Yr. Make Cyl Description
1967 Up CHEVROLET 8 ROUGH IDLE, PERFORMANCE USAGE, GOOD MID AND UPPER RPM TORQUE AND HP, MILD BRACKET RACING, AUTO TRANS W/ 3000+ CONVERTER, 3400-3800 CRUISE RPM, 10.0 TO 11.5 COMPRESSION RATIO ADVISED. BASIC RPM 3000-6500
Engine Size Configuration
396-454 C.I. V

Valve Setting: Intake .000 Exhaust .000 HOT

Lift: Intake @Cam 359 @Valve 610 All Lifts are based
on zero lash and theoretical rocker arm ratios.
Exhaust @ Cam 372 @Valve 632
Rocker Arm Ratio 1.70

Cam Timing: TAPPET @.004
Lift: Opens Closes ADV Duration
Intake 37 BTDC 79 ABDC 296 °
Exhaust 85 BBDC 39 ATDC 304 °

Spring Requirements: Triple Dual Outer Inner
Part Number 99896
Loads Closed 132 LBS @ 1.906 or 1 29/32
Open 414 LBS @ 1.306
Recommended RPM range with matching components
Minimum RPM 3000
Maximum RPM 6500
Valve Float 6800

Cam Timing: TAPPET @.050
Lift: Opens Closes Max Lift Duration
Intake 10 BTDC 44 ABDC 107 234 °
Exhaust 58 BBDC 4 ATDC 117 242 °

fastlane40

Holy shirt,you are the man Comanche.This won't work with my GenV unless i change my rockers.Is that correct?

fastlane40

GPM.Thanks for your advice.I don't want to muck with the rockers so can you suggest a cam that will go straight in and work better than stock with a blower?

Comanche3Six

direction

GPM

sorry, I misunderstood.