On the 7208 and wilder grinds we recommend having a slot cut down
the middle of the timing gear to create two rows of teeth.This helps reduce oil throw off and oil foaming at high rpms.
Lifters must always be reconditioned or replaced.Beware of aftermarket 914 lifters, some of them are of very poor
quality.
INTAKE
ROCKER ARM RATIO = 1.3:1 EXHAUST ROCKER ARM RATIO = 1.25:1
GRIND
NO.
SEAT
DURATION
CAM
LIFT
LASH
APPLICATION
64508-H
258
258
.294
.294
I
HYD.
E
HYD
HYDRAULIC
LIFTER.
WILL
WORK WITH F.I.
6508-H
260
260
.292
.292
I
HYD.
E
HYD
HYDRAULIC
LIFTER STREET GRIND A LITTLE ROUGH WITH F.I.
68508-H
274
274
.302
.302
I
HYD.
E
HYD
PERFORMANCE
HYDRAULIC, MORE COMP, & GOOD EXH. SYSTEM.
914
255
254
.296
.282
I
STD.
E
STD.
STOCK
SOLID LIFTER GRIND.
330-1
256
255
.296
.296
I
STD.
E
STD.
IMPROVED
STOCK. MORE LOBE AREA THAN STOCK. GOOD W/ F.I.
6408-18
256
256
.296
.296
I
STD.
E
STD.
WIDE
TORQUE BAND. A LITTLE ROUGH WITH FUEL INJECTION.
66508-19
266
266
.305
.305
I
STD.
E
STD.
CARBS
REQUIRED. SMOOTH IDLE, 1500-4500 RPM.
M6708-18
268
268
.314
.314
I
STD.
E
STD.
REQUIRES
CARB AND A GOOD EXHAUST SYSTEM.
7008-17
280
280
.333
.333
I
STD.
E
STD.
BIG
BORE KIT, CARBS, 9:1 AND HEADER, 2000-6000 RPM
7208-17
288
288
.333
.333
I
STD.
E
STD.
BIG
BORE KIT, 9.5:1, CARBS, AND HEADER 2500-6000 RPM
7207-19
288
288
.369
.369
I
STD.
E
STD.
HOT
STREET - AUTOCROSS. 9.5+:1, 2500-7000 RPM.
7508-18
300
300
.350
.350
I
STD.
E
STD.
AUTOCROSS.
10.5:1, 3800-7300 RPM.
7708-17
308
308
.369
.369
I
.008
E
.010
FULL
RACE.11.5:1,
3800-7300 RPM.
If you have a car in mind, which is not listed, please call us!
