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Message: <blockquote data-quote="pcmoddingmy" data-source="post: 1063949832" data-attributes="member: 25616">I believe the TS is currently using BT engine and plans to overhaul it. So, he's asking if using SVT head on his BT block and BT ITB.Well... I think it defeats the purpose of using SVT head as the cost involved to port match the SVT head to BT ITB and might end up with no significant power gains. Might as well send the current BT head for proper port polishing & matching (no need to enlarge the ports) and preferably do a flowbench as well. Usually on a BT engine, some guys will opt for SVT pistons as it will increase the compression a bit.Regarding 0.5mm head gasket, I think its quite risky because TRD & Toda only sells 0.8mm. Plus if you skim the head say 0.1mm or 0.2mm, then the compression is gonna be very high for street use especially if you plan to use RON95 fuel. Else, its gonna knock like crazy!As I know, when increasing compression it helps to gain power with proper tuning via piggyback or standalone, but with stock ECU it will worsen the performance because the ECU is going to retard the timing the moment it detects knocking. Also, compression increase and be accommodated with aftermarket cams that usually higher duration & lift which will improve flow into the head and reduce knocking. So with hi-cams and hi-comp, the tuner can tune the engine with more aggressive ignition hence making more power.Also, you can consider regrinding your stock camshafts at Matspeed Sunway. These guys are famous for regrinding camshafts but I never heard of anyone doing it for 20v though.Just my 2cents...</blockquote>

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