POWER RECAP
For this dyno test we thought we could do a little better by installing a set of Vortec cylinder heads and trying COMP Cams Magnum roller tip rocker arms. Our 355-cid small-block clocked in at 422 peak hp and 452 lb/ft of torque. Average horsepower and torque were at 339 and 426, respectively.

MOTOR SPECS:
GM four-bolt, 355-cid, 9.4:1 compression, GM Vortec iron heads (SDPC PN SD8060A, 64cc chambers, 170cc intake runner volume, 1.94/1.50 valves), COMP Cams 1.6:1 Magnum roller tip rockers (PN 1418-16), Edelbrock RPM Air Gap Vortec intake manifold (PN 7516), Speed Demon 750 carb, 1-inch open carb spacer, COMP Cams XE262H cam (262/270 adv duration, 218/224 duration at .050, .462/.469 valve lift, 110 lobe separation) straight up, 1 /34-inch Hooker headers, 91-octane Shell Unleaded fuel

VORTEC POWER
RPMTQHP
2600399198
2800408218
3000421240
3200430262
3400436282
3600440302
3800444321
4000448341
4200451361
4400450377
4600443388
4800438401
5000431410
5200421416
5400409421
5600396422
5800373411
Max452422
Avg426339

355-cid VORTEC SPECS
Bore / Stroke / CID:4.030 / 3.48 / 355 cid
Compression:9.4:1
Block:GM factory four-bolt 350
Crank:SCAT cast-steel PN 1101-11133
Pistons:Probe forged (PN 130212334-030)
Rods:Probe (PN 1201-10062) 5.7"
Rings:Total Seal Moly
Bearings:Clevite
Gaskets:Mr. Gasket and GMPP
Cam:COMP Cams (XE262H) 218/224 at .050, .462/.469 lift, 110 LS
Lifters:COMP (PN 858-16)
Chain:COMP (PN 2100)
Pushrods:COMP (PN 7372-16)
Rockers:COMP 1.6:1 (PN 1418-16)
Heads:GMPP Vortec (Scoggin-Dickey PN SD8060A)
Manifold:Edelbrock Performer RPM Air Gap (PN 7516)
Carb:Demon (PN 1402010VE)
Distributor:Pertronix (PN D1000)
Spark Plugs:Autolite AR103
Oil System:Milodon HV (pan PN 31505)
SOURCE
Automotive Racing Products (ARP)
531 Spectrum Circle
Oxnard
CA  93030
805-278-7223
Summit Racing Equipment
P.O. Box 909
Akron
OH  44309
Pertronix
440 E. Arrow Hwy.
San Dimas
CA  91773
800-827-3758
www.pertronix.com
Milodon
2250 Agate Ct.
Simi Valley
CA  93065
805-577-5950
www.milodon.net
COMP Cams Autolite Allied Aftermarket Division
105 Pawtucket Ave., Dept. KC
Rockford
RI  02916
Mr. Gasket Company
10601 Memphis Ave., #12
Cleveland
OH  44144
216-688-8300
www.mr-gasket.com
Edelbrock
Dept. 5.0
2700 California St.
Torrance
CA  90503
310-781-2222
www.edelbrock.com
Scat Enterprises
3-10/-370-5501
scatenterprises.com
McKenzie's Cylinder Heads
Total Seal
Phoenix
AZ
800-874-2753
totalseal.com
Probe Racing
1650 W. 228th St., Dept. EM
Torrance
CA  90501
Scoggin-Dickey (SDPC)
5901 Spur 327
Lubbock
TX  79424