Harland Sharp High Performance Roller Rockers

All '68-'72 iron 429/460 engines have screw-in studs that must be upgraded to use adjustable roller rockers. The '73-and-later nonadjustable heads (like these fulcrum-style rockers) can be machined to accept adjustable roller rockers.

All '68-'72 iron 429/460 engines have screw-in studs that must be upgraded to use adjustab

Cam Specs
	Adv. Dur.	Duration @ 0.050	Lift	LSA
Performer-Plus flat-tappet hydraulic
Intake	272	194	0.460	110
Exhaust	282	204	0.480
Performer RPM flat-tappet hydraulic
Intake	290	234	0.556
Exhaust	300	244	0.581	108

Flow Testing
Big-block Ford 429/460 aluminum, Edelbrock PN 61649 2.19/1.76-inch valves 75cc chamber 310cc intake port (measured 313 cc) Intake-port cross-sectional area: 3.79 square inches Exhaust port cross-sectional area: 2.12 square inches
Lift (in)	INT	EXH (w/pipe)	E/I (%)
0.100	68	61	90
0.200	136	109	80
0.300	201	148	73
0.400	253	174	69
0.500	300	191	64
0.600	305	202	66
0.700	312	206	66
0.800	320	-	-
The E/I column represents the percentage of exhaust to intake (E/I) flow. Generally, anything around 70 percent or higher is considered good. The exhaust-flow numbers were generated with a flow pipe.

Cam Specs
Comp Cams Mechanical Roller 110-degree lobe separation angle Installed at 110 degrees Using 1.72 rocker ratio
	Adv. Dur.	Duration @ 0.050	Lift	LSA
Intake	296	260	0.726	(minus 0.028) = 0.698 net lift
Exhaust	304	268	0.726	(minus 0.030) = 0.696 net lift

Big Block Ford Engine Build Roller Rockers

Using the Edelbrock heads and roller rockers also requires slightly shorter hardened pushrods. Grubbs had a set of Pioneer pushrods in stock that are similar to the Cobra Jet units.

Using the Edelbrock heads and roller rockers also requires slightly shorter hardened pushr

Project 642
This test of The JGM 466ci Ford featured a Comp mechanical-roller cam and fully ported factory iron heads squeezing 12.2:1 compression. Grubbs tested the engine on 110-octane race gas using an Edelbrock Victor 460 single-plane intake and a 1,050-cfm Holley Dominator carb with biggie 2 1/8-inch headers.
RPM	TQ	HP
4,000	492	375
4,200	513	410
4,400	539	452
4,600	556	487
4,800	569	520
5,000	565	538
5,200	560	555
5,400	553	569
5,600	551	587
5,800	553	611
6,000	546	623
6,200	541	638
6,400	527	642

Avg	543.5	539.0
Peak	569	642
Power/ci	1.22	1.38

SOURCES
Automotive Racing Products 1863 Eastman Ave. Ventura CA 93003 800-826-3045 www.arp-bolts.com	Holley Performance Products (Holley, Hooker) Bowling Green KY holley.com
Edelbrock Dept. 5.0 2700 California St. Torrance CA 90503 310-781-2222 www.edelbrock.com	Jon Kaase Racing Engines 735 W. Winder Industrial Pkwy Winder GA 30680
Federal-Mogul 26555 Northwestern Hwy. Southfield MI 48034 248-354-7700 www.federal-mogul.com	Memory Lane 11311 Pendleton St. Sun Valley CA 91352 818-504-3341
Ford Racing Performance Parts 44050 N. Groesbeck Hwy. Clinton Township MI 48036 5-86/-468-1356 www.fordracingparts.com	Summit Racing Equipment P.O. Box 909 Akron OH 44309
Jim Grubbs Motorsports 28130 Crocker Ave. Unit 331 Valencia CA 91355 661-257-0101	Total Performance 10039 Prospect Ave. Santee CA 92071 619-562-9894
Harland Sharp Strongsville OH 440-238-3260 www.harlandsharp.com	Trick Flow Specialties 1248 Southeast Ave. Tallmadge OH 44278 330-630-1555