Dyno results before my Gen 4 upper swap by Dan Lesser- '97 GTS.

[heath1225]

'97 GTS with Hennessey headers and exhaust, and smooth tubes.

455hp/477tq on a Dynomite Dyno.

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About what I expected. Now lets see what it makes with the Gen 4 upper. I hope around 600/600!

 

[Roy]

Is this an easy swap or aren't the engines that much the same?

 

[heath1225]

Its not a simple "bolt on" upgrade.