fuhh...nowdays this kind of thingys also need 600 to 700... current market cylinder head how much ar ? during my times 4 to 5 years back if the lifter spoil we just changed the head as the cost is much cheaper..
Anyone know this : The exhaust housing from RB20 can be changed to match the RB25 unit? If so, theoritically, the RB20 exhaust + RB25 inlet housing match would spool faster? Thank you