Need help with timing.

[jb666]

Does anyone know what the 472 Hemi timing should be set at??

[firefighter3931]

It really depends on the build ; cam profile, compression etc...



Ron

[jb666]

Ron -- To the best of my knowledge, nothing has changed from the crate specs:

The 472 Hemi® Crate Engine with increased displacement and power is an impressive step up from the familiar 426 Hemi. Mopar
Performance recommends the use of an 850 cfm Holley Carburetor and 2.00" Exhaust Headers (not available through Mopar).
472 HEMI® CRATE ENGINE — 525 HORSEPOWER
Specifications:
• Built with all-new components
• Heavy-Duty Cast Iron Block with cross-bolted mains
• Cast Iron Cylinder Heads
• Chrome Valve Covers
• Breathers
• Stainless Steel 2.25" Intake Valves and 1.94" Exhaust Valves
• Heavy-Duty Single Valve Springs with Dampers
• Premium Material Valve Stem Seals
• 292° Hydraulic Camshaft — 0.524"/0.507" lift
• Forged Pistons — 4.250" bore, 9.0:1 compression ratio
• Aluminum Dual-Plane M1® 4-bbl Intake Manifold
• Forged Steel Crankshaft — 4.150" stroke
• Premium Double Roller Timing Chain and Sprockets
• Front Timing Chain Cover
• 6-quart Rear Sump Oil Pan (1970–71 B- and E-body style)
• 7 mm Silicon Spark Plug Wires
• Spark Plugs
• High-Performance Electronic Distributor
• Heavy-Duty Engine Stand and Shipping Crate
Note: 9.0 :1 compression ratio allows the use of current high-octane premium pump gasoline. Crate
engines that change the emissions performance of the vehicle may not be legal for use on
vehicles regulated for highway use in California and other states. Horsepower and torque
rating based on test engine. Ratings may vary on individual engines.
*P5249666AC 472 Hemi Crate Engine — 525 Horsepower, 540 ft.-lbs. Torque.

[firefighter3931]

JB,

with that cam & compression i would start at 18* @ idle and 34-35* total all in by 2500-3000rpm. Hemi engines usually don't require as much "total" advance as a wedge. 



Ron