Ford Racing 347 Series Sealed Engine Handbook
Issue Date January 25, 2013 Revision #7
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Operating and Tune Up Information – D347SR – D347SR7 – S347JR
Recommended Timing 34° BTDC Total 4000 rpm
Maximum RPM 6100 rpm
Oil Pan 9 Quart plus filter/cooler w/ M-6675-D347SR Pan
Oil Filter M-6731-FL1A
Oil Pressure 60-70 psi @ 240° F/ 4000 rpm
Recommended Oil 15w-50 Mobil 1 or 20w-50 Brad Penn
Max Oil Temperature 280° F
Coolant Temperature 195° F Thermostat recommended
Spark Plugs AGSP-32C
Firing Order 1-3-7-2-6-5-4-8
Fuel Pressure (@ carburetor) 6-7 psi
Engine Service Information and Specifications
Standard Operating Specifications
Main Bearing Clearance .0020" -.0025"
Rod Bearing Clearance .0020" -.0025"
Crankshaft End Float .005"- .007"
Wrist Pin to Rod Clearance .0010"-.0012"
Wrist Pin to Piston Clearance .0010"-.0012"
Piston to Deck Distance .010" Below Deck
Piston to Bore Clearance (follow Piston mfg. recommendations)
Intake Valve to Guide Clearance .0014"-.0016"
Exhaust Valve to Guide Clearance .0018"-.0022"
Valve Lash 0 Lash plus ¼ turn Pre-load – ½ to ¾ turn maximum