they are dart iron eagle platinum 200 heads...got a good deal on them...practically brand new when i bought them before the engine let go....600.00 for the pair.....new thay are like 1400 for the pair....as to why i went turbo was the efficiency was alot better than the roots blower setup i used to run.......i run 14 lbs at the moment with no issues so far. im also at 8.5:1 for a compression ratio
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