408 stroker rpm questions

PRH said
If it’s really falling on its face at 4900-5000, it’s more than likely a “problem” other than a combination issue.
Without knowing how the heads are set up, I’d lean towards floating the valves myself....... especially if it feels the same, at the same rpm point, in every gear.
Other possibilities are fuel or ignition woes.
Click to expand...
PRH said
If it’s really falling on its face at 4900-5000, it’s more than likely a “problem” other than a combination issue.
Without knowing how the heads are set up, I’d lean towards floating the valves myself....... especially if it feels the same, at the same rpm point, in every gear.
Other possibilities are fuel or ignition woes.
Click to expand...


valve springs sounds likely to me , lots of parts need upgrading as stated in other posts in order to get the most performance from your stroker . Also lifters could be a problem causing valves to float .