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The argument was that going up and down the hills it would be a cooler head. I tend to think that professional who designed the engine for my car were probably more knowledgeable about what was best than my machinist friend. I also suspect he may have had a set of motor home heads he wanted to sell! Mike Moore On Mar 2, 2015, at 2:37 PM, Rich Barber <c300@xxxxxxx> wrote: I read somewhere that it is risky to machine the heads in my ram K engine for hard seat inserts as there is not much “meat” under the lip and one might cut into the coolant passage. Any truth in that? The RV/truck engine would have a much different cam/carb/distributor advance configuration for high torque at low RPM and might be more susceptible to higher operating temperatures for long periods of time. Most of the heat from the valve heads can only flow to the coolant while the valve is closed and sitting on the seat. Testing in the engine lab helped define the need for different construction and coolant flow for different conditions. Nowadaze, this is all modeled on a computer which tends to produce pretty good results, I believe. C300K’ly, Rich Barber Brentwood, CA From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Michael Moore mmoore8425@xxxxxxx [Chrysler300] Sent: Monday, March 02, 2015 1:57 PM To: Robert Merritt Cc: John Nowosacki; Rick Vitek; christopher; <Chrysler300@xxxxxxxxxxxxxxx> Subject: Re: [Chrysler300] 413 motor I/d help Years ago when I experience my valve recession problem on my 300H with a fresh engine, the machine shop in Portland Oregon who put hgardened seats in my heads tried to convince me that I needed motorhome engine heads because they were cooled much better . I resistedbut have always wondered what THAT story was. Mike Moore 300H On Mar 2, 2015, at 1:08 PM, Robert Merritt okbobwynmer@xxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote: Caution!!!!!!!!!!!!!!!! 413 Truck engines are not the same as 413 car engines. At least in the larger trucks, they have timing gears instead of chain, which means the cam and distributor turn backwards to car engines, and there are also oth er differences in push-rods, etc.. I once knew a shop that tried to install a car short block in a 2-ton farm truck, and couldn't get it to run. I shared both a car and truck shop manual with them and we finally got it figured out. I believe we ended up using a set of adjustable push-rods and a car distributor, but that has been 20+ years ago, so I may be wrong. It was just before harvest, and the farmer having the work done was frantic to get it going. Bob Merritt North central Oklahoma !965 barn-stored 300-L and parts car
On Monday, March 2, 2015 12:04 PM, "John Nowosacki jsnowosacki@xxxxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:
I think there were also differences in the water pump/cooling/intake/heads on the motor home engines. The heads look like big block heads, but have slanted spark plugs like a 318 or 340. Water pump housing on front of motor was different, too. I used to have a set of heads, but couldn't even give them away at Carlisle.
__._,_.___ Posted by: Michael Moore <mmoore8425@xxxxxxx> To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to https://groups.yahoo.com/neo/groups/all/manage/edit For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang __,_._,___ |
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