Pre-Unit A Group
Part No | Description (C.R. = Compression Ratio) | Model | Years | |
| DO NOT FORGET TO STATE SIZE REQUIRED. Pre-unit A Group Standard bore sizes and piston to bore clearances are (Clearances in inches): -1947-51 long stroke A7 std bore = 62mm. Clearance, std compression piston .003/.005; high compression .004/.006.1952-62 A7 std bore = 66mm. Clearance .002/.004; split skirt pistons .0011/.0031; 8:1 C.R. after CA7SS 4501 .0035/.005.1951-63 A10 std bore = 70mm. Clearance .003/.0045; split skirt .0028/.0045; 8.5:1 C.R. in A10SR .004/.0055; 8.75 C.R. in RGS .001/.0025. | ||||
11094 | Piston, 6.6:1, STD / 20 / 40 / 60 / 80 | A7 | 1951-62 | |
11151 | Piston, 6.6:1, STD | A7 | 1947-50 | |
10030 | Piston, 7:1, STD, 20, 40, 60 | A7 | 1947-50 | |
11288 | Piston, 7.25:1, STD, 20, 40, 60 | A7 | 1951-62 | |
11603 | Piston, 8:1, STD, 20, 30, 40, 60 | A7 | 1951-62 | |
67-1558 | Piston, 8.5:1, std. Other sizes are 67-1560 +20; 67-1562 +40; 67-1558/60 +60 | A7SS | 1960-62 | |
12502 | Piston, 8.6:1, STD, 30 | A7 | 1947-50 | |
11016 | Piston, 6.5:1, STD, 20, 40, 60, 80 | A10 | 1950-62 | |
11062 | Piston, 7.25:1, STD, 20, 40, 60 | A10 | 1950-62 | |
67-0429 | Piston, 7.25:1 genuine Hepolite STD Other sizes are 67-0431 +20, 67-0433 +40, 67-0435 +60 | A10 | 1950-62 | |
11787 | Piston, 8.25:1, – STD, 20, 40, 60 | A10 | 1950-62 | |
67-1370 | Piston, 8.26:1 STD available only | A10 | 1950-62 | |
11412 | Piston, 9:1, STD, 20, 40, 60 | A10 | 1950-62 | |
15638 | Piston, 10.5:1, +30 available only | A10 | 1950-62 | |
R3630 | Ring set for original or Hepolite pistons. This set will fit if the oil ring groove depth is increased by .008” for the +.040” and +.060” sizes. The standard and+.020” sizes do not require any modification STD, 20, 40, 60 (per piston) | A7/ST | 1947-50 | |
R3570-90 | Ring set for GPM pistons. This set will fit if the compression ring grooves are increased in depth by .010” on standard and +.020” sizes only. STD , 20 , 40 , 60 | A7 | 1947-50 | |
R4550 | Ring set, STD, 20, 30, 40, 60 | A7/ST/SS | 1950-62 | |
R3650 | Ring set STD, 20, 40, 60 | A10 | 1950-62 | |
67-0100 | Gudgeon pin | A7 | 1947-50 | |
67-0392 | Gudgeon pin | A7 | 1951-62 | |
65-0440 | Gudgeon pin | A10 | 1950-62 | |
67-0101 | Circlip | A7/ST/SS | 1947-62 | |
67-0101A | Circlip for GPM pistons | A | ||
66-0954 | Circlip | A10 | 1950-62 | |
2012 | Cylinder liner, long stroke | A7 | 1947-50 | |
2207 | Cylinder liner, 66 mm bore | A7 | 1951-62 | |
2131 | Liner 70mm bore | A10 | 1950-62 | |
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