A forged crankshaft And and 4 bolt block with heavy duty rods and forged pistons...all balanced and blueprinted. Forged pistons are arguably not a good choice for a street engine though since the expansion rates have been known to cause premature wear.

 

You can look for a heavy duty truck or performance motor that has the forged crank stock..... around here there's a local machine shop that sells 30 over 4 bolt blocks cleaned up and machined for 4-500.00 (I can't remember which) .

 

Id personaly never start by opting up a crate engine , i feel that the sense of accomplishment and ownership are greater when youve done the work your self, not every one has time skill(although most do and dont know it) or desire to build there own motor, which would be the case were i suggest a crate. True to the point that the scat 9000 series crank is better than cast, but if youd noticed the first question i asked was about budget, budget and goals dictate componets, which will dictate dependability right? If you build a 383 for 400 horse you could keep the rpms lower than that of a 350 built for 400 horse, right, wouldnt you agree? Next up, i drove my vette only about 20 miles today, but my wife and children say i drive everything as if ive stollen it on my last day on earth, living up to this, i was trying to drag race my 400 horse pickup truck the day i bought it, so in twenty miles i probably hit 6200 rpm 5 times and count in my mind 7 seperate burn outs, i know, you can say it, a teen age boy in a 40 year olds body. Now then to the roller cam subject, ive personaly never wiped a lobe, but have feared it, and it makes me cringe every time some one puts a higher than stock lift cam shaft in an Engine that the spent 40 or more houres labor and countless dollars, knowing that there is a possibility how ever remote we might think that it is, for not. So i dont dissagree, i just do things differently is all. Its been proven time and time again, that you dont have to go forged internals, high dollar heads and roller cam, but its alot harder to go wrong doing so. Truth of the matter comes down to how hard do you abuse your equipment, i really dont know the op from Adam and if hes anything at all like me he'll need forged internals...