Need some input. Having an engine built and money has become an issue (when is it not, I guess-- Sucks not winning the lotto again this week!). My Engine builder (obnoxious) wants me to pick between roller and Flat Tappet cams. The Flat T cam will save significant coin... No cam grind yet, as he hasn't put the heads together. He's trying to offer me ways to save money, which I REALLY REALLY appreciate! I'm coming here for input, because I feel bad for Barry. I'm burying him in questions and I don't want to piss him too far off.. Think I'm starting to annoy him. (Sorry Barry!)
I know roller has has steeper ramps and "more area under the curve" than Flat, but I'm wondering how critical it is w/ my motor, because I don't want to turn crazy rpm. Might I get similar power w/ flat Tappet?? Motor is good stuff. 565 NA motor. Single 1050 Dominiator. Dart Tall deck, Dart pro 1 heads etc., and it'll be pushing a Sanger 21 cruiser w/ 37's (currently) and a T-400 tranny. My goal 700 ish HP and want to turn max 6K rpm (when geared properly-- if not currently).
Also-- can someone shed light as when is the correct time to replace roller lifters? I guess, more correctly, how do I tell when the roller lifters need replacement. Do you hear it? Or does power go away? Or do you do it every x hundred hours to avoid catastrofic failure?
Prior to build, my heart was set on Roller Cam. Now I'm not so sure because of money and maintenance.
Thanks for your input!