
Installation Instructions
and Warranty Information
For ’67-’70 390/427/428 Mustang
Part# Application Notes
6656S 67-70 Mustang 390 GT 41, 42
6655S 67-70 Mustang 390/427/428/428CJ C6/C4 39, 41, 42
6654S 67-70 Mustang 390/427/428/428CJ 5spd 39, 41, 48, 49, 50
39 Will not t standard 390 cylinder head.Head ange is designed for 14 bolt 390 GT cylinder head only.
41 Fits most rack and pinion conversions.
42 Requires JBA power steering ram drop down bracket for use with factory power steering.
43 Not designed for 5 spd trans applications
48 Fits 5 spd w/aftermarket cross member
49 Will not t factory power steering.Fits manual steering.
50 Fits aluminum Shelby block
Read all instructions carefully before attempting installation.
Rev. 06/11
Corporate Ofce: PerTronix Inc. 440 E. Arrow Highway, San Dimas, California 91773 * Phone 909.599.5955 • FAX 909.599.6424
WARNING: The product accompanying this document is legal only for off-highway use (except in California or
states that have adopted California emission standards), racing use or for use on pre-emission-controlled motor
vehicles/motor vehicle engines (pre-1966 domestic vehicles certied to California standards, pre-1968 domestic
vehicles certied to federal standards and all pre-1968 foreign vehicles), per the manufacturer’s application guide.
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