Honda K20A / K20Z CAMSHAFTS
The newest engine in the Honda tuning community. The "K Series" is Honda's mass produced version of the roller rocker valve train assembly found in the S2000. Less friction, more rpm potential, faster action cam profiles...this engine has untapped potential. First introduced in the JDM Integra Type-R in 2001, this engine put out a respectable 220HP @ 8000 rpm straight from the factory (DC5). The K20A also sees service in the JDM Civic Type-R, using the same compression and cam profiles. The first USDM production model was the K20A2 found in the 02-04 RSX-S. Other engines featuring the same head configuration include the K24A2 (TSX) that features a 9.114" deck height, the K20Z1 in the 05-06 RSX-S that includes various JDM Type-R add-ons like cams, throttle bodies, higher compression and Honda's answer to the tuning crowd, the K20Z3 found in the 2006-up Civic Si.
| Stage | Description | Part# | Adv. Dur. | Dur @ .050 | Lift (in) | Lift (mm) | Kit# | Dyno | Price | Shop | Status |
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Forced Induction Specification Short duration profile builds cylinder pressure by reducing overlap, high lift for more air intake. Requires kit BC0040 or BC0040S. |
BC0041 | 296°/300° 248°/248° 245°/245° |
222°/224° 182°/182° 182°/182° |
.520"/.497" .367"/.367" .325"/.325" |
13.21/12.62 9.32/9.32 8.25/8.25 |
BC0040 | 
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$534 |
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SEE BELOW. | BC0042-2 | 304°/300° 252°/252° 246°/246° |
234°/228° 186°/186° 178°/178° |
.525"/.472" .357"/.357" .313"/.313" |
13.34/11.99 9.07/9.07 7.95/7.95 |
BC0040 | 
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$647.5 |
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SEE BELOW. | BC0043-2 | 314°/310° 256°/256° 250°/250° |
244°/240° 190°/190° 184°/184° |
.525"/.518" .369"/.369" .323"/.323" |
13.34/13.15 9.37/9.37 8.20/8.20 |
BC0040 | 
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$647.5 |
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Normally Aspirated Specification A step up from all previous stage cams, the Stage 4's are designed for high end all motor applications. Requires BC0040 and extensive tuning. |
BC0046 | 324°/320° | 255°/248° | .564"/.509" | 14.32/12.93 | BC0040T |
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SEE BELOW. | BC0047 | 330°/330° | 258°/258° | .570"/.516" | 14.50/13.11 | BC0040T |
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USDM K20A2 (RSX-S) | Stock | 302°/305° | 219°/215° | .483"/.431" | 12.27/10.95 |
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USDM K24A2 (TSX) | Stock | 310°/302° | 210°/212° | .451"/.453" | 11.45/11.50 |
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JDM K20A (DC5) | Stock | 320°/318° | 224°/219° | .483"/.424" | 12.27/10.77 |
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Honda K20A / K20Z 8620 Steel Billet CAMSHAFTS
After years of high end race and dyno testing, BC has released a line of 8620 steel billet camshafts that deliver the ultimate in high performance. Made from aerospace grade, 8620 steel billet material and CNC ground on state-of-the-art cam grinders, these BC cams deliver the utmost in rigidity at extended rpm range while reducing possible valve float. These are the best cams money can buy and are now available for all stages…including the popular Stage 2 all motor profile.
| Stage | Description | Part# | Adv. Dur. | Dur @ .050 | Lift (in) | Lift (mm) | Kit# | Dyno | Price | Shop | Status |
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Normally Aspirated Specification Hot street/strip or road race spec. Use with CAI, H, E, ECU, A/F mods. Excellent street manners and idle quality. Requires kit BC0040 or BC0040S. |
BC0042-2 | 304°/300° 252°/252° 246°/246° |
234°/228° 186°/186° 178°/178° |
.525"/.472" .357"/.357" .313"/.313" |
13.34/11.99 9.07/9.07 7.95/7.95 |
BC0040 |
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$647.5 | ||
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Normally Aspirated Specification Intended for fully built engine. Extensive modifications, high compression pistons. Also works on K24 all motor. Requires kit BC0040 or BC0040S. |
BC0043-2 | 314°/310° 256°/256° 250°/250° |
244°/240° 190°/190° 184°/184° |
.525"/.518" .369"/.369" .323"/.323" |
13.34/13.15 9.37/9.37 8.20/8.20 |
BC0040 |
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$647.5 | ||
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Normally Aspirated Specification The ultimate high performance camshafts for the Honda K Series head. These cams are the traditional VTEC (3 lobe). |
BC0047 | 330°/330° | 258°/258° | .570"/.516" | 14.50/13.11 | BC0040T | ||||
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Normally Aspirated Specification The ultimate high performance camshafts for the Honda K Series head. These cams are a single lobe format (1 lobe). |
BC0047-2 | 330°/330° | 258°/258° | .570"/.516" | 14.50/13.11 | BC0040T |
