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
15
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 cent/- 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 cent/- 1°
Note 1
– valve spring installed height achieved by +/- 0.050” valve locks or valve spring shims