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sup does anyone know whats the difference between the K20A2 and the K20A3 head? would i be alright buying an A3 head if i plan on changing the whole valvetrain? thanx alot
 

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You cannot turn an A3 head into an A or A2 head.The A3 heads(along with all of K24's except the TSX) does not have lma's or even a spot machined in the head for lma's,so there would be nothing to support the middle,vtec lobe rocker.

You can still build the A3 heads to flow well and make good power.
 
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