Which Mopar engines breathe well enough to make use of 7000+ RPM?
I think it goes without saying that Chrysler has provided many of the absolute best engines ever made, especially when talking about performance engines.
That said it seems like they're often designed to make their power down low in the RPM range...which is almost always more useful for street engines, can be put to excellent use on the drag strip too...but it is still a different experience than what you might get in something like a Boss 302 or a '69 Z/28 where you can zing the engine well past 6,000 RPM, keep making power and not punch a connecting rod through the side of the block.
Sure, having to wring an engine's neck to go fast is not always the fastest way to make power but it sure is a hell of a lot of fun.
Which Mopar engines do the best job of this kind of performance? The 340 4bbl and 340 Six Pack seem to be the best candidates but in stock form, both of these motors make their peak power in the mid 5000 RPM range. Still pretty damn good but it's a long way from being useful at 7k.
Has anyone build a Mopar engine to rev like this? Can it be done?
Are the Gen 3 Hemi engines candidates for high RPM build?
The way engines were delivered as stock and what can be done to them afterwards are 2! Totally different worlds. Some manufacturers made engines that were good power makers at 6K OOTB. Some don’t have to!
Getting a small block to rev safely past 6600 is minor oil mods and past 6900/7000K make requires a little more attention and effort.
Im not so sure about the Ford oiling system, but the Chevy can go very high in the rpm range as delivered and stock.
When it comes to making an engine make power at said rpm, the first things is attention to the oiling system so it will live and then the overall engine package. It boils down to getting the air in and out as effectively as possible without restriction.
Then it is camshaft specs and valve spring control.
If you get the valve springs to control the valve on that high lift long duration camshaft your in good shape.
MoPar engines have small ports vs there CID when you compare them not only to other stock engines but they show a massive deficit on the race side of what needs to be done.
Also, do so be reminded that just because you can rev an engine to engine 10,000, doesn’t mean your making any lower up that high. My Chevy friend tried to brag about spinning his small block to 10K ...... and I told him just what I typed above. Hey! I can’t help it if he got mad as hell at me. It was his *** he put on his shoulders. Not me.
Bottom line, it’s all about the package and a good balance of it coupled with quality parts and machine work with a great oiling system, yea, you’ll get there!
