L72 engine

[3macs1]

Hi Keith:
I'm suprised that the big engines would not make the rated HP. The dyno graphs Gm published for them at the time clearly show they did and if anything GM derated the actual HP.
I have only had one BB ever on a dyno a oval port 427 390 hp and it produced 431 Hp . I know it was bored 30 over and the engine rebuilder was told to do what they want inside to get the max HP but it has to stay original outside and not be decked to keep the vin. It did have headers installed but it's original reworked quadrajet and points.
Same time the brothers that built it are well known in Nova Scotia for their ability to produce HP. Those who know them will remember their 10 second white camaro with the 292 chevy 6 cylinder which they raced across canada and the US for years.
Great guys. I Really don't know what they did vs stock nor did I ask at the time.
Same time these guys could probally pull 50 hp out of a craftsman lawn tractor.