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Mopar LA Rod vs. Stroke Chart

To use this Chart
1. From Table I: confirm original displacement. Block deck height should be 9.60".
2. From Table II: select crank-shaft type in Column 1.
3. Confirm stroke length in Column 2.
4. Connecting rod to stroke ratio appears in Column 3.
5. Column 4 gives nominal piston compression distance for ".000" (zero) deck height in the intersecting box.
6. Actual piston compression distance must be adjusted (+ or -) to allow for gasket thickness, quench distance, compression ratio, chamber volume, etc.
Table I·
Original Displacement Year
273 1964-67
318 (5.2 Ltr.) 1967-*
340 1967-72
360 (5.9 Ltr.) 1972-*
Table II·
Crankshaft Type Stroke Length Rod Ratio, Std. LA CD, Std. LA
Std. 273, 318, 340 3.31" 1.85-1 1.822"
Std. 360 3.58" 1.71-1 1.687"
Mopar stroker 3.79" 1.62-1 1.582"
Mopar stroker 4.00" 1.53-1 1.477"

Notes
1. 360 crank-shaft material is cast-iron only
2. Rod ratios assume use of std. LA connecting rods, 6.123" centers
3. 4.00" crank-shaft available for 340 & 360 mains

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