I bought a Hemi - Project Lit'lphant

[oldeskewltoy]

(04-16-2020 07:52 AM)Bean Wrote:  Hope they fit. 10.35 sounds like your going for quite some dynamic compression or are the cams going to bring it down a lot?

The goal is a cam I can twist to 6000 rpm(makes peak hp about 5600) We anticipate a duration of 280+ [215-225(@ .050")], planned lift is to be about .450".

Once I know the current cam specs, I'll report them... but since the centerlines are 110, then they likely are short duration cams - likely around 195-205(@ .050"), that would limit overlap, and allow for a smooth idle, and would go along with the low compression - the original engine was 9:1. I do "know" (alleged) the specs on the original engine 162whp @4400, and 214#/ft @ 3600. That peak hp also tends to favor a shorter duration cam

* - It's tough to compare quad valve, with 2 valve when it comes to camshafts. Typically a 2 valve needs more "overall" duration then a quad valve engine. For example... stock 4AG cams are 240/232 [204/198(@.050")], and they pull to about 6600-6700. The same "overall" duration in a V8 may only pull to 4500. Now a big part of it has to do with ramps. 4AG ramp rates are much high/faster then a flat tappet V8.

For example... a Poncam is 264 total, and 222 @ .050". A V8 cam having 300 overall duration will "only" have 224" @ .050". The ramp rates in most V8s are softer.

I'm relying on my engine builders to help me get what I'm after... good power.. with just enough lope that you know there is a cammed Hemi under the hood....