Hi,

Thanks for responding.Is engine configuration same for both the BUSCH cup and the Nextel Cup? When you say some use an over-bored 358 Cu. in, that is a good 600 cc increase in the capacity,which is quiet substantial, how are these cars allowed to run an 600cc + over the regulations? I have heard that the cast iron block used in the engines havent changed since 1968, is this true?

I mean no offence,but the technology aspect of the motorsports has always interested me more than anything else.F1 has been in the forefront of technology and not surprisingly its also been the most expensive form of motorsports ever.Are there any particular reason why an "open formula" is not used in NASCAR? Why is foreign manufacturer participation not encouraged? When the regulations and technology used doesnt change,how does this benefit in the R & D for the road cars?sorry for so many questions...but NASCAR is new to me..