Ford Racing 347 Series Sealed Engine Handbook
Issue Date January 25, 2013 Revision #7
No part of this document may be reproduced without the prior agreement and written permission of Ford Racing
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D347SR – D347SR7 Engine Rebuild Specifications
Crankshaft weight 49.00 lbs - +/- 0.50 lbs
Piston to Deck Distance .010" Below Deck - +/- .0050"
Head gasket – minimum compressed thickness .038" (M-6051-CP331)
Maximum bore size 4.040" (.010" overbore)
Stroke 3.400" +/- .007"
Valve spring installed height 1.750" – 1.800" - see note 1 below
Valve spring pressure - seat 130 lbs @ 1.800"
Valve Spring Pressure – Open 313 lbs @ 1.175"
Valve Diameter - Intake 2.020" +/- 0.005"
Valve Diameter - Exhaust 1.600" +/- 0.005"
Combustion chamber volume 63.0 cc - +/- 2.0 cc
Compression ratio 10.0:1 Maximum
Camshaft Lift - int. and ex. 0.320" Lobe Lift - 0.528” at the valve
Camshaft installation – D347SR 0° position on crank gear
Camshaft timing – D347SR 109° degree intake centerline +/- 1°
Ground on 114° lobe separation angle
Note 1 – valve spring installed height achieved by +/- 0.050” valve locks or valve spring shims.
S347JR Engine Rebuild Specifications
Crankshaft weight 49.00 lbs - +/- 0.50 lbs
Piston to Deck Distance .010" Below Deck - +/- .0050"
Head gasket – minimum compressed thickness .038" (M-6051-CP331)
Maximum bore size 4.040" (.010" overbore)
Stroke 3.400" +/- .007"
Valve spring installed height 1.750" – 1.800" - see note 1 below
Valve spring pressure - seat 130 lbs @ 1.800"
Valve Spring Pressure – Open 313 lbs @ 1.175"
Valve Diameter - Intake 1.940" +/- 0.005"
Valve Diameter - Exhaust 1.540" +/- 0.005"
Combustion chamber volume 58.0 cc - +/- 2.0 cc
Compression ratio 10.0:1 +/- 0.2
Camshaft Lift - int. and ex. 0.323" Lobe Lift - 0.533” at the valve
Camshaft installation 0° position on crank gear
Camshaft timing 106° degree intake centerline +/- 1°
Note 1 – valve spring installed height achieved by +/- 0.050” valve locks or valve spring shims
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