What is Head-Quarters USA?
Head-Quarters began in 1969 with Doug Coffey and a vision. Since then, the demand for Doug's special blend of high performance and dependibility has been overwhelming. Head-Quarters USA was established in order to better serve the needs of retail customers in the US. Nothing else has changed...same great products by the same great company. Welcome to Head-Quarters USA.Piston Specifications
YOU WILL FIND THIS INFORMATION HANDY FOR CALCULATING COMPRESSION RATIOS.
|
TWIN CAM ENGINE | ||||
|
Brand |
Compression |
Engine Size |
Dome Volume |
Weight |
|
Harley-Davidson |
9:1 |
1450 |
-1.5 CC’s |
598 grams |
|
Harley-Davidson |
10:1 |
1450 |
|
|
|
Harley-Davidson |
9.25:1 |
1550 |
-1.5 CC’s |
601 grams |
|
Harley-Davidson |
10.25:1 |
1550 |
8 CC’s |
626.5 grams |
|
Harley-Davidson |
9.6:1 |
1550 (SE) |
3.5 CC’s |
602.8 grams |
|
Keith Black |
9.25:1 |
1550 |
-1.5 CC’s |
543 grams |
|
Keith Black |
10.5:1 |
1550 |
16.7 CC’s |
592.8 grams |
|
Wiseco |
9.3:1 |
1550 |
-1.5 CC’s |
513.5 grams |
|
Wiseco |
10.5:1 |
1550 |
10.6 CC’s |
533 grams |
|
EVOLUTION ENGINE | ||||
|
Brand |
Compression |
Engine Size |
Dome Volume |
Weight |
|
Harley-Davidson |
8.5:1 |
1340 |
-1.5 CC’s |
544.5 grams |
|
Harley-Davidson |
10:1 |
1340 |
12 CC’s |
|
|
Harley-Davidson |
10.2:1 |
1340 |
14.5 CC’s |
|
|
Harley-Davidson |
10.5:1 |
SE 1340 |
|
|
|
Harley-Davidson |
11.7:1 |
SE 1340 |
|
|
|
Head Quarters |
Angle Top |
89” S&S |
|
490 grams |
|
Keith Black |
8.5:1 |
1340 |
.1.5 CC’s |
492.5 grams |
|
Keith Black |
9.5:1 |
1340 |
6 CC’s |
581.2 grams |
|
Keith Black |
10.5:1 |
1340 |
14.5 CC’s |
512.5 grams |
|
Wiseco |
8.5:1 |
1340 |
-1.5 CC’s |
493 grams |
|
Wiseco |
10:1 |
1340 |
11.6 CC’s |
484.7 grams |
|
EVOLUTION SPORTSTER ENGINE | ||||
|
Brand |
Compression |
Engine Size |
Dome Volume |
Weight |
|
Harley-Davidson |
|
883 |
- 1.5 CC’s |
406 grams |
|
Harley-Davidson |
|
1200 |
- 1.5 CC’s |
520.5 grams |
|
Keith Black |
9:1 |
1200 |
- 1.5 CC’s |
491 grams |
|
Wiseco |
9.5:1 |
883-1200 |
|
430 grams |
|
Wiseco |
9:1 |
1200 |
- 1.5 CC’s |
461 grams |
|
Wiseco |
10.5:1 |
1200 |
6.4 CC’s |
474 grams |
|
Wiseco |
Thunderstorm |
1200 |
|
477 grams |