1 engine modifications for o-ring distributors installation instructions form 1361 (rev. b) 02/03 general information some distributors for chevrolet engines have two o-ring grooves on the lower shank. these distributors require the engine blocks distributor hole and oil gallery holes chamfered approximately 0.060 x 30. this is to remove the sharp (cutting) edges of the distributor hole and oil gallery holes. do not use o-rings if the engine is not modified. the o-rings will be damaged during the installation of the distributor and debris from the o-rings will fall into the crankcase or lodge in the oil gallery. if the engine is not modified install the distributor without o-rings. engine block distributor hole oil galley oil galley chamfer, 3 places approx. 0.060" x oil galley oil galley intake manifold intake manifold distributor engine block nitrile o-rings, 2 places id: 1.114 0.010 thickness: 0.070 0.003 mallory is a division of the mr. gasket performance group 10601 memphis ave. #12, cleveland, oh 44144 216.688.8300 fax 216.688.8306 www.mrgasket.com form 1361 (rev. b) 02/03 made in u.s.a. printed in u.s.a.
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