Video's (youtube etc..)

Charlie_es_cool said
I’ve had this thought for a while. I think it’s the ports. I bet if you analyzed one of those ports you’d find it has good speed and port energy. Plus the combustion chamber is 40 years advanced vs our old iron heads.

And they respond to cam swaps well because the factory cams are tiny! On non HP engines, they have duration in the 190’s @ 0.050. Lift is around the .470’s which ain’t too bad, but either way. They’re baby cams.

Put a good head on one of our dinosaur engines and watch it come close to an LS engine. It’s been done here:

Re-testing 318 (dyno) after changes on Tues

Wouldn’t be surprised if adding 1.7 rockers and using a roller cam on that same engine would put it within spitting distance of a 5.3 with a similar sized cam and compression.

I was thinking similar, but even still though the popular LS 706 is topping 230 cfm @ .700 getting 2 -2.4 hp per cfm with what most would consider fairly mild cams for the output.

Magnums are know to respond well to cams and don't flow that much worse, seems to make like a 100 hp less with similar cams on a 5.9l.

I imagine the ports are efficient but that seems super efficient.

But I do notice there exhaust ports flows really well was thinking that had a bunch to do with it too.