โAug-15-2004 01:22 AM
โJul-28-2007 09:01 PM
โJul-28-2007 04:04 PM
Jarlaxle wrote:
The 440 is a better choice, carb to oil pan. There is no case where I would prefer a 413.
โJul-28-2007 03:38 PM
โJul-28-2007 02:57 PM
โJul-28-2007 02:48 PM
โJul-28-2007 02:47 PM
โJul-28-2007 02:45 PM
โJul-28-2007 02:35 PM
โJul-28-2007 01:14 PM
Jarlaxle wrote:
One major reason the 413 uses smaller valves is very basic: it has a smaller bore than the 440 (all RB's have the same stroke), and the larger ones simply do not fit easily. IIRC, most of the HD 413's & 440's (and most "dash-3" engines in general) are governed to under 4000RPM. There's no tach in my friend's class C (1974 B-300, 440-3), but the engine is certainly not a revver.
The best Mopar big-block heads are the later open-chamber ones, from the 1968-ish 906 to the last of the 400 & 440's in 1978. In fact, the later ones are BETTER, since they all have hardened exhaust seats for unleaded gas.
โJul-28-2007 10:46 AM
โJul-27-2007 08:43 PM
Big_John wrote:
In the industrial engine, yes, Chrysler did their homework and I'm sure the valve size is great for that application. A motorhome? I don't know. First you've got more cubic inches to feed. There's no getting around that. Then you're not running at a constant speed like you are with a stationary industrial engine. I think the small valve may narrow the power band. Under 3000 RPM may be fine for you, but for me, climbing steep hills and sometimes towing a car trailer, there are times were the RPM in my motorhome goes over 3000 RPM.
Honestly? It may work fine. Chrysler used the bigger valves in all the 440's they built though. They never saw the need to use a smaller valve.
Try it and report back. Its got me curious.
โJul-27-2007 12:54 PM
โJul-27-2007 12:48 PM
MasterBoondocker wrote:Big_John wrote:
Yes, I guess you're right that you wouldn't have to use that pump, but I thought that was the idea. ๐
Does the industrial engine have the removable valve seats? All the other big block Mopar heads I've ever seen don't have this.
I still think the valves are too small, even in the low RPM range, but that's only my opinion. It would be interesting to see how well they work in this application though.
That massive pump is not required to use the heads ... but under heavy load -- it does prove it's worth.
Those valve seats ARE removeable - indeed. But in the many sets I have seen ... I have never seen a "smoked seat". Now on the 440 heads ... I have seen heads that have had the valve sunk almost .200. Are you also aware that the exh valves had rotators on them? ...
How well they work in "this" application ? .... the proof is in the pudding. Chrysler really did their home-work on these heads.
You question the valve size ? ..... at under 3k rpm? ....why?
โJul-27-2007 12:20 PM
โJul-27-2007 11:31 AM
79powerwagon wrote:eyeteeth wrote:
I'm curious... what have others been doing about replacing/updating propane tanks for the opd valve regulation on these older units? Can they use "standard" 20-30-40 lb tanks?
My truck came new with 2-20 lb tanks. I simply went to the RV place and bought 2 new hoses with the new style connector and BINGO! All done! The previous owner was even nice enough to "forget" that he the new tanks there (probably for a grill since they wouldn't work on the rig), so my only expence was for the 2 new lines!!!! :B