| Originally posted by Monty |
SP4 has the same engine as SPS with the exception of the exhaust cam.
Sorry mate, no it doesn't. Internal engine detail defferences are too many to mention on here, lightweight Penkl rods for a start. The difference between the SPS engine and the pukka CORSA was that the SPS engine was detuned by fitting a 91 spec CORSA zorst cam and a different airbox.
There were a few so called SPS's knocking about very early on that were SP4'z that were tarted up by addition of some hotter cams, but they were definately NOT true SPS/SP4S's.
The SP5 had the same engine as the SPS supposedly. Funny how the SP5 made about 10 horse less though.