Honda K20A3 / K24A CAMSHAFTS
A USDM only production engine, the K20A3 and similar cylinder head configurations were developed for a performance, yet economical mindset. Although VTEC, it is only featured on the intake camshaft. The K20A3 is found in the 01-03 Civic Si while the K24A1 is in the 01-03 CR-V. The K24A4 is the most popular of them all due to the fact that was used to service the 03-up Accord as well as the 02-03 Element. Because of it's tall deck height (9.114"), the trend will be to take these blocks and use the K20A/K20Z head found in the 06-up Civic, 01-06 RSX-S for more rpm potential and added tuning ability. However there will be plenty of tuners wanting to stay true and run the original K20A3 head.
| Stage | Description | Part# | Adv. Dur. | Dur @ .050 | Lift (in) | Lift (mm) | Kit# | Dyno | Price | Shop | Status |
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Forced Induction/NA Street Specification Short duration profile builds cylinder pressure by reducing overlap, high lift for more air intake. Requires kit BC0050. |
BC0051 | 284°/284° | 193°/193° | .410"/.410" | 10.41/10.41 | BC0050 or BC0040 |
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$508.75 |
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Normally Aspirated Specification Hot street/strip or road race specification. Use with CAI, H, E, ECU, A/F mods. Excellent street manners. Requires kit BC0050. |
BC0052 | 296°/284° | 206°/193° | .429"/.410" | 10.89/10.41 | BC0050 or BC0040 |
$508.75 |
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USDM K20A3 (Base RSX/Civic) | Stock | 270°/276° | 181°/173° | .372"/.383" | 9.45/9.73 |
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USDM K24A (Accord/CR-V) | Stock | 270°/276° | 181°/173° | .372"/.383" | 9.45/9.73 |
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Rocker Ratio: 1.75:1 mid, 1.7:1 sec, 1.7:1 pri
No valve timing events due to variable intake cam. WARNING: If running a late model cylinder head (after 2004), you may need to purchase BC2940 keepers to accommodate the BC2010 or BC2011 retainers. Honda changed the keeper groove angles, therefore y
