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Title: ST4 heads on an S4? Post by: DTR on June 01, 2011, 08:55:44 PM Scratching my head trying to remember......the S4R has the ST4 (and ST4S) heads....right?
Title: Re: ST4 heads on an S4? Post by: Speeddog on June 01, 2011, 09:45:27 PM AFAIK:
S4R and ST4s are same heads, valves 36/30, short duration intake cams, std 4V exhaust cams. S4 and ST4 are same head, valves 33/29, short duration intake cams, std 4V exhaust cams. All of the above are the 'dropped cam' heads; exhaust cams are ~10mm closer to the deck than SBK heads. Title: Re: ST4 heads on an S4? Post by: DTR on June 02, 2011, 12:43:01 PM Thanks for the speedy reply.
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