Ford Racing 347 Series, S347JR, D347SR, D347SR7 Handbook
Ford Racing 347 Series Sealed Engine Handbook
347 Series Sealed Racing Engine
Sanctioning Body Specifications Handbook
S347JR D347SR/D347SR7
No part of this document may be reproduced without the prior agreement and written permission of Ford Racing
Issue Date January 25, 2013 Revision #7
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Ford Racing 347 Series Sealed Engine Handbook
Table of Contents
Page
Factory Seals 3-4
Block 5
Crankshaft 5-6
Connecting Rods 7
Piston 7
Timing Chain 7
Cylinder Heads 8-9
Rocker Arms 10
Lifters 10
D347SR Technical Specs 11-12
S347JR Technical Specs 12-13
Operating and Tune-Up Info 14
Service Info and Specs 14
D347SR Rebuild Specs 15
S347JR Rebuild Specs 15
Tech Inspection Information 16
Z304DA Head Tech Specs 17
7MM Valve Conversion Option 18
Torque Specifications 19
D347SR & D347SR7 Parts List 20-21
S347JR Parts List 22-23
Revision Summary 24-25
Ford Racing 347 Series Specs vs. GM Crates 26
Crankshaft Finishing Photos 27-28
Z304DA Head Identification 29-33
For more information on Ford Racing Sealed Racing engines, contact Mike Delahanty 313845-1995 or mdelaha3@ford.com
No part of this document may be reproduced without the prior agreement and written permission of Ford Racing
Issue Date January 25, 2013 Revision #7
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Ford Racing 347 Series Sealed Engine Handbook
Engine Sealing
Ford Racing Circle Track engines use a 1" (25.4 mm) diameter cap seal with FRT 6-digit
serial number. Factory built engines are sealed at the factory by 6 seals in 3 locations:
• Oil pan rail – left and right side
• Front cover – 2 on the top left and right of the front cover
• Intake Manifold – one on the drivers side front and one on the passenger side rear
No part of this document may be reproduced without the prior agreement and written permission of Ford Racing
Cap plug seals are a two piece design.
The base is secured by the bolt and
encapsulates the head of the bolt. This
base includes fingers that interlock with
the cap when installed. Any sign of
tampering or removal is easy to detect.
Issue Date January 25, 2013 Revision #7
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Ford Racing 347 Series Sealed Engine Handbook
Shown below is a close-up of the Ford racing factory seal with "FRT" and 6 digit seal number
with each seal having a unique number. Ford Racing maintains complete records of each
Factory Original seal number, its location and the engine to which it belongs.
Oil pan seal location – one on each side of the oil pan
Sanctioning Body Sealing – Each sanctioning body is encouraged to use the Ford Racing
Factory sealing process of cap seals should engine teardown or repairs be necessary. Note
that Ford Racing will not issue replacement cap seals.
No part of this document may be reproduced without the prior agreement and written permission of Ford Racing
Issue Date January 25, 2013 Revision #7
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Ford Racing 347 Series Sealed Engine Handbook
Engine Description
Block – D347SR – D347SR7– S347JR
Crankshaft – D347SR - D347SR7 – S347JR
• M-6303-C340
• Main journal size 2.250"
• Rod journal size 2.123"
• Stroke 3.400"
• Material Forged Steel
• Weight 49.00 lbs. (+/- 0.5 lbs)
• Balance offset Neutral balance
• SCAT Part number 432300105090
• Crankshaft manufacturer Scat
Block M-6010-BOSS302
• Bore diameter 4.030"
• Main bearing bore 2.248"
• Main cap torque 100 Inner 35 outer
• Main cap material Nodular Iron
• Bore spacing 4.380"
• Block deck height 8.200"
• Material Iron
• Weight 175 lbs
No part of this document may be reproduced without the prior agreement and written permission of Ford Racing
Issue Date January 25, 2013 Revision #7
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balance tuning
Crankshaft Identification
Ford Racing 347 Series Sealed Engine Handbook
The SCAT Part number is
located in the first counterweight
but is often partially hidden by
the balancing heavy metal and
the metal finishing of the area
There may be light
grinding on the side of
the rod throw for final
All of the rod throws have a lightening hole as shown
See page 27 for more Crankshaft identification photos
No part of this document may be reproduced without the prior agreement and written permission of Ford Racing
Issue Date January 25, 2013 Revision #7
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•
Ford Racing 347 Series Sealed Engine Handbook
Connecting Rod – D347SR- D347SR7 – S347JR
• Forged 4340 I-Beam manufactured by Scat (Scat PN 2-1CR5400-927)
• 5.400 Center to Center length
• 0.927" Pin
• Small end uses a bronze bushing
• Uses ARP 8740 3/8" Cap Screw Bolds
Piston – D347SR- D347SR7 – S347JR
Mahle Forged Aluminum Piston – PN SBF090030F06
• Bore - 4.030" Compression Height - 1.090" (with rail)
• Forced pin oiling and round wire locks
• Weight w/o pin - 395 grams
• 10.0 compression ratio
• 6cc piston dish volume
• Ring Pack - 1.5, 1.5, 3.0mm rings Mahle PN 4035MS-15
• Mahle 4.035” Service Piston PN SBF 090035F06
Timing Set – D347SR - D347SR7– S347JR
Timing set part number - M-6268-A302
• D347SR and S347JR - Factory installation is the 0
degree position on the crankshaft gear
No part of this document may be reproduced without the prior agreement and written permission of Ford Racing
Issue Date January 25, 2013 Revision #7
7
Cylinder Heads
– D347SR
V
alve Spring
– D347SR
–
D347SR7
–
S347JR
Ford Racing 347 Series Sealed Engine Handbook
• Ford Racing Aluminum - M-6049-Z304DA
• Service replacement head PN is M-6049-Z304D
• Fully machined combistion chamber
• Chamber Volume - 63cc (nominal)
• Intake Valve – 2.020" diameter. Total length – 5.340"
• Exhaust Valve – 1.600" diameter. Total length – 5.365"
• Both intake and exhaust valves are stainless steel with
swirl polished heads
• Valve seals on both intake and exhaust
• Rocker arm stud – ARP 334-7203
• Stamped guide plate – M-6566-Z304D
• NOTE: 0.110”- 0.130” flat washer is used under the
rocker arm stud in some production heads to achieve
the correct thread engagement
Cylinder Heads – D347SR7
• Ford Racing Aluminum - M-6049-Z304DA7
• Service replacement head PN is M-6049-Z304D
• Same as M-6049-Z304DA except for the 7MM valves:
o M-6507-D3047 Intake Valve
o M-6505-D3047 Exhaust Valve
• Beehive valve spring – M-6513-BH – Identified by silver
finish for the COMP 26918 Spring and Brown for PAC
1218 Spring
• Approved optional spring – COMP 26918 w/ enhanced
surface finish
• Valve spring locator .060" thick – M-6536-BH
• Retainer – M-6514-BH
• Valve Locks – 10 degree - M-6518-BH (STEEL) (11/32”)
• Valve Locks – 10 degree - 13171-8 (STEEL) (7MM)
• Valve spring installed height - 1.750" – 1.800"
• Valve spring closed pressure - 130 lbs. @1.800"
• Valve spring open pressure - 313 lbs. @ 1.175"
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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