I read somewhere that GM "suggests" a 7200 rpm limit on 454 a.d 7400 limit on shorter stroked 396/427.Stock,production motors :shock: Intermittent,not constant.I used to take my 402 with stock CAST crank and rods to 7000+ all the time,no problems.But...when you're in high school and don't know any better seems like you could get away with more.If it is properly balanced and you have no valve control problems(which I imagine it is and I doubt you will)I'd think you'll be fine.But I wouldn't want to do it every weekend.But that's an opinion from a non-professional engine builder.Remember that !!!
