[ENTDOC]

I have had both engines. A 427R in a SPF Daytona Coupe and a 427SR in a SPF GT40 MK11. I would take the SR hands down over the R. Both of my cars were tuned well and both were very fast and even though the r made more power on the dyno, I could not really tell a difference when driving them. The R hated city traffic but the SR would cruise in all conditions. I would highly advise anyone to take the SR or comparably tuned motor over the high strung R types unless your driving is strictly high speed ( very few of us qualify ). If it is important to tell folks you have over 550hp, then just tell them that, they will not know the difference.