Editing Chrysler B engine (section)

===426 Wedge===
[[File:1966 Dodge Charger (5184677542).jpg|thumb|1966 Dodge Charger engine bay]]
Not to be confused with the [[Chrysler Hemi engine|426 Hemi]], the {{cvt|426|cuin|L|1}} RB was a wedge-head RB block with a {{cvt|4.25|in|mm}} bore. The 426 Wedge served as Chrysler's main performance engine until the introduction of the 426 Hemi. It was initially offered as the "non-catalogued" option S42 in Chryslers (the number of such produced is uncertain), offered with {{cvt|373|or|385|hp|0}} via a single 4-barrel carburetor (11.0:1 or 12.0:1 [[compression ratio]], respectively), or {{cvt|413|or|421|hp|0}} via ram-inducted dual four-barrel carburetors (with the same compression ratios).<ref>{{cite journal|journal=Collectible Automobile |date=December 1994 |page=57 |title=1960-62 Chrysler "Positively No Jr. Editions" |first=Jeffrey I. |last=Godshall}}</ref> For 1963, horsepower ratings would slightly increase (see below), and it became optional in [[Chrysler B platform|B-bodied]] Dodges and Plymouths. After 1963, it would be used only in Dodges and Plymouths.<ref>{{cite book|last=Flory, Jr. |first=J. "Kelly" |title=American Cars 1960–1972 |publisher=McFarland & Coy |year=2004 |page=220}}</ref>

The Max Wedge was a race-only version of the 426 Wedge engine offered from the factory. Known as the Super Stock Plymouth and Ramcharger Dodge, the Max Wedge featured high-flow cylinder heads developed through then state-of-the-art airflow testing.<ref name="Atherton"/> It had {{cvt|1+7/8|in}} exhaust valves, which required the cylinder bores to be notched for clearance. The blocks were a special severe-duty casting with larger oil-feed passages than other RB engines, and were stress-relieved by the factory. Induction came by means of a cross-ram intake manifold tuned for peak power above 4000&nbsp;rpm and two Carter AFB-3447SA 4-barrel carburetors. The Max Wedge also included high-flow cast-iron [[exhaust manifold]]s that, on the later versions, resembled steel tube headers. The Max Wedge was factory rated at {{cvt|415|or|425|bhp|kW|0}} (depending on compression), and {{cvt|480|lbft|0}} at 4400&nbsp;rpm.

Before the end of the 1963 model year, Chrysler introduced the Stage II Max Wedge with improved combustion chamber design and an improved camshaft. The last performance year for the Max Wedge was the 1964 Stage III. The factory-advertised power rating never changed despite the Stage II and III improvements.

A ''426 Street Wedge'' engine was also available in 1964 and 1965. An increased-bore version of the standard [[Chrysler New Yorker|New Yorker]] 413 single 4-barrel engine, it bears little relation to the Max Wedge except for basic architecture and dimensions. It was available only in [[Chrysler B platform|B-body]] cars (Plymouth and Dodge) and light-duty [[Dodge D Series]] trucks.