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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# Cam Card Dyno Shop Status
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
N/A In-Stock
USDM K20A3 (Base RSX/Civic) Stock 270°/276° 181°/173° .372"/.383" 9.45/9.73
USDM K24A (Accord/CR-V) Stock 270°/276° 181°/173° .372"/.383" 9.45/9.73
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 your stock keepers/locks may not fit the BC retainers properly causing potential damage.
619.749.9018 ph
619.749.9128 fx
Some products listed are not legal for sale or use on emission controlled motor vehicles, RPM ranges vary on application.Warranty Information Copyright © Brian Crower Inc. All rights reserved.   Follow runBC on Twitter     
WARNING: This product can expose you to chemicals, including Chromium (hexavalent compounds), lead and lead compounds, which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit