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
9
Cylinder Heads
– S347JR
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Ford Racing Aluminum - M-6049-X306 or
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Ford Racing Aluminum - M-6049-X307
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Cast combistion chamber
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Chamber Volume – 58cc (nominal)
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Intake Valve – 1.94" diameter. Total length – 5.078"
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Exhaust Valve – 1.54" diameter. Total length – 5.078"
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Both intake and exhaust valves are stainless steel with
swirl polished heads with an undercut stem
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Both iron and bronze valve guides are used in the
production heads
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Valve seals on both intake and exhaust
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Uses self aligning roller rockers – 1.6:1 ratio