Car Craft Magazine

Cam Specs
Cam Description	Adv.	Dur @	Valve	Lobe
	Dur.	0.050	Lift	Sep.

Mech. Roller, 286R
Int.	276	246	0.635	110
Exh.	284	254	0.635

These specs are with a 1.6:1 rocker ratio
Lash: Int., 0.012-inch; Exh., 0.014-inch

Power Tests

Test 1 was our baseline run with a 750-cfm Holley HP carb on 91-octane pump gas with 10.5:1 compression

Test 2 added the Wilson Manifolds 1-inch tapered spacer. Note the overall increase in torque.

Test 3 added an 830-cfm Holley carb along with the 1-inch spacer. Note that the larger carburetor made more peak power, but also cost torque throughout all but the peak power area.

		TEST 1		TEST 2		TEST 3
RPM	TQ	HP	TQ	HP	TQ	HP
3,600	426	292	427	292	416	285
3,800	426	308	429	311	422	305
4,000	424	323	426	324	421	320
4,200	423	338	427	341	422	337
4,400	425	356	431	361	425	356
4,600	429	376	440	385	434	380
4,800	440	402	446	408	444	406
5,000	447	425	454	433	450	428
5,200	449	445	457	453	454	450
5,400	448	461	451	463	451	464
5,600	442	471	444	473	444	473
5,800	435	480	442	487	440	485
6,000	428	488	432	494	435	497
6,200	414	489	418	493	422	498
6,400	408	497	410	499	414	504
6,600	403	506	408	513	408	513
6,800	394	511	397	514	398	515

Parts List

Component	Manufacturer	Part Number
Production block	OEM	used
Stroker crank kit	Scat	1-347FHPS
Cam, mech. roller	Comp Cams	custom order
Heads, assembled	Trick Flow	TFS-52400100
Intake, Victor Jr.	Edelbrock	2921
Carburetor, 750 HP	Holley	0-80529-1
Carburetor, 830 HP	Holley	0-80509-1
Carb spacer, four-hole	Wilson	024110
Oil pan, Fox chassis	Moroso	20509
Oil pump pickup	Moroso	24517
Headers, 13/4-inch	Hooker	see catalog
Distributor, billet	MSD	8579
6AL box	MSD	6420
Plug wires, universal	MSD	3118

With a big heads and cam, a single-plane intake is the only logical choice, and Duttweiler's choice for this engine was an Edelbrock Victor Jr. He also tried both a 750-cfm Holley (shown) and a larger 850-cfm HP version. Overall, the 750 HP Holley offers a better power curve even though the 850 made more peak horsepower.
With a big heads and cam, a single-plane intake is the only logical choice, and Duttweiler
Experimenting with one of Wilson Manifold's trick 1-inch aluminum four-hole tapered spacers that improved mixture distribution and power. The spacer under the 750-cfm Holley was worth as much as 11 lb-ft of torque at 4,600 rpm while improving power throughout the entire power band.
Experimenting with one of Wilson Manifold's trick 1-inch aluminum four-hole tapered spacer
Given all this power potential, we had to ensure we didn't lose power to a weak ignition, so Duttweiler went with an MSD Billet distributor and MSD-6AL box to light the fire along with a set of MSD spiral-core plug wires.
Given all this power potential, we had to ensure we didn't lose power to a weak ignition,

On the dyno, Duttweiler also used a Moroso Fox-body Mustang style pan and pickup to simulate an engine in a later-model Mustang along with a set of Hooker headers. Keep in mind that the raised exhaust port on these heads may present header fitment problems.
On the dyno, Duttweiler also used a Moroso Fox-body Mustang style pan and pickup to simula

SOURCES
Autotronic Controls Corp. (MSD) El Paso TX 9-15/-857-5200 msdignition.com	Moroso Performance Products 203-453-6571 moroso.com
COMP Cams	Quaker State
CSI Performance Products 16936 County Road 252 McAlpin FL 32062	Scat Enterprises 3-10/-370-5501 scatenterprises.com
Edelbrock Dept. 5.0 2700 California St. Torrance CA 90503 310-781-2222 www.edelbrock.com	Trick Flow Specialties (TFS) 1248 Southeast Ave. Tallmadge OH 44278
Holley Performance Products (Hooker) www.holley.com	Wilson Manifolds 4700 NE 11th Ave. Ft. Lauderdale FL 33334 954-771-6216 www.wilsonmanifolds.com