Quote:
Originally Posted by autotechmotoring
Most available aftermarket performance parts are only available for the P11 heads. The P12 heads uses different valve springs, retainers, guides, seals, valves etc. The exhaust ports are exactly the same on both P11 and P12 vs the intake is slightly different in port dimensions and bolt on locations.
The main difference that would make the P12 head "flow" better is that it uses a smaller diameter valve stem 5.5mm vs most SR's that use 6mm.
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I didnt know you were on the forum !?! I know someone that upgraded to 6mm stem on is p12 and use p11 valve spring by machining the spring seat
Give a look to autotech motoring guys , they make killer parts for our engines !
