Join Date: Jan 2019
Location: Sedgwick, Kansas
Yeah, Macstang, this is a nice dyno queen, but honestly, it's beyond what would be realistic for a car you drive a bunch. 500+ horses through a stock block, even with a girdle, is a ticking timebomb of fail.
Using good build practices, ensuring that everything's balanced, lightweight reciprocating parts, tolerances checked carefully, sharp edges chamfered, etc. etc. etc - all that stuff will help ANY engine last longer. However, the limit here is just how much force a stock 302/289 block can take. The beautiful but tiny Windsor smallblock is at the ragged edge at around 500 hp. After putting all that time and effort into a motor, I sure wouldn't want to find out how long it lasts, the hard way.
I think 400 is 'safe'. 450 is *probably* safe given careful attention to details. But 500+ can be expected to fail. There are a few guys who have made many passes on their 5.0 engines at this power level, and didn't blow up, but those engines are absolutely remarkable and any race builder would tell you the same. They were expected to blow up. It's a miracle, not the status quo.
"No matter what you are, be the best one you can." -Abraham Lincoln