How To Improve Power On 1976 460
#16
10-19-2014, 09:22 PM
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Big Dog,
I dont have that motor home any more, broke down on a trip, towing service came, hooked up & ended up totaling the motor home & trailer.
I have some more info though since that last post.
The stellite exhaust seats didnt hold up. The next long trip after the trip above trip, the exhaust valves started reseading up in the head again & the skips came back.
Repairing the heads after that trip, I installed carbide exhaust seats from Tucker Valve seat out of Tenn & no more head problems. Next was the trip the towing co totaled everything. Come to find out, lost oil pressure from either the dizzy shaft, the oil pump went out or either the oil pump pickup tube broke off (AGAIN).
I'm only guessing what failed, but I know the engine lost oil pressure reason for the break down.
After dealing with the stock 460 heads, I would say choose a cam you would like, the #3500 Summit worked fine for me, but on the heads, get the sodioum filled exhaust valves & the have the carbide exhaust seats installed & the port the exhaust ports as large as you feel safe carving & maybe a good set of long tube Thorley headers.
If your pulling the weight, & even a c class would be, you got to do everything you can to get the exhaust heat out of those heads.
Summit or Jegs, cant remember right off where I ordered them, but they stock a set of rocker arm post shims, in two different thicknesses to shim up the rockers & gain some valve clearance should they start to loose clearance. They are easy to make yourself as well, just some thin tin & tin snips & a hole puncher & get the job done.
Neil
I dont have that motor home any more, broke down on a trip, towing service came, hooked up & ended up totaling the motor home & trailer.
I have some more info though since that last post.
The stellite exhaust seats didnt hold up. The next long trip after the trip above trip, the exhaust valves started reseading up in the head again & the skips came back.
Repairing the heads after that trip, I installed carbide exhaust seats from Tucker Valve seat out of Tenn & no more head problems. Next was the trip the towing co totaled everything. Come to find out, lost oil pressure from either the dizzy shaft, the oil pump went out or either the oil pump pickup tube broke off (AGAIN).
I'm only guessing what failed, but I know the engine lost oil pressure reason for the break down.
After dealing with the stock 460 heads, I would say choose a cam you would like, the #3500 Summit worked fine for me, but on the heads, get the sodioum filled exhaust valves & the have the carbide exhaust seats installed & the port the exhaust ports as large as you feel safe carving & maybe a good set of long tube Thorley headers.
If your pulling the weight, & even a c class would be, you got to do everything you can to get the exhaust heat out of those heads.
Summit or Jegs, cant remember right off where I ordered them, but they stock a set of rocker arm post shims, in two different thicknesses to shim up the rockers & gain some valve clearance should they start to loose clearance. They are easy to make yourself as well, just some thin tin & tin snips & a hole puncher & get the job done.
Neil
#17
10-25-2014, 07:24 PM
Postmaster
Big Dog,
I dont have that motor home any more, broke down on a trip, towing service came, hooked up & ended up totaling the motor home & trailer.
I have some more info though since that last post.
The stellite exhaust seats didnt hold up. The next long trip after the trip above trip, the exhaust valves started reseading up in the head again & the skips came back.
Repairing the heads after that trip, I installed carbide exhaust seats from Tucker Valve seat out of Tenn & no more head problems. Next was the trip the towing co totaled everything. Come to find out, lost oil pressure from either the dizzy shaft, the oil pump went out or either the oil pump pickup tube broke off (AGAIN).
I'm only guessing what failed, but I know the engine lost oil pressure reason for the break down.
After dealing with the stock 460 heads, I would say choose a cam you would like, the #3500 Summit worked fine for me, but on the heads, get the sodioum filled exhaust valves & the have the carbide exhaust seats installed & the port the exhaust ports as large as you feel safe carving & maybe a good set of long tube Thorley headers.
If your pulling the weight, & even a c class would be, you got to do everything you can to get the exhaust heat out of those heads.
Summit or Jegs, cant remember right off where I ordered them, but they stock a set of rocker arm post shims, in two different thicknesses to shim up the rockers & gain some valve clearance should they start to loose clearance. They are easy to make yourself as well, just some thin tin & tin snips & a hole puncher & get the job done.
Neil
I dont have that motor home any more, broke down on a trip, towing service came, hooked up & ended up totaling the motor home & trailer.
I have some more info though since that last post.
The stellite exhaust seats didnt hold up. The next long trip after the trip above trip, the exhaust valves started reseading up in the head again & the skips came back.
Repairing the heads after that trip, I installed carbide exhaust seats from Tucker Valve seat out of Tenn & no more head problems. Next was the trip the towing co totaled everything. Come to find out, lost oil pressure from either the dizzy shaft, the oil pump went out or either the oil pump pickup tube broke off (AGAIN).
I'm only guessing what failed, but I know the engine lost oil pressure reason for the break down.
After dealing with the stock 460 heads, I would say choose a cam you would like, the #3500 Summit worked fine for me, but on the heads, get the sodioum filled exhaust valves & the have the carbide exhaust seats installed & the port the exhaust ports as large as you feel safe carving & maybe a good set of long tube Thorley headers.
If your pulling the weight, & even a c class would be, you got to do everything you can to get the exhaust heat out of those heads.
Summit or Jegs, cant remember right off where I ordered them, but they stock a set of rocker arm post shims, in two different thicknesses to shim up the rockers & gain some valve clearance should they start to loose clearance. They are easy to make yourself as well, just some thin tin & tin snips & a hole puncher & get the job done.
Neil
But thank you for posting up your experience with using the 460 in a motorhome. Your input is very helpful as far as what is the short comings of the 460 in a RV. Mind you my old motorhome only has 76k on it but I have a rear main seal leaking and a broken exhaust manifold bolt. So sometime within the next year I plan on pulling the motor to address them issues. And from what you are saying I think I'll have the heads redone and then I am afraid the snowball effect will come into play. Cam, lifters, oil pump, fuel pump, timing chain, intake manifold, carb, headers. Who knows but my dumb butt will end up doing more than I need to in hopes I don't end up on the side of the road dead. That and this old motorhome was my dad's and I plan on also gutting the interior and redoing EVERYTHING. My wife says it is because I have OCD like that is a bad thing. I don't see it as a problem !! My problem is not enough cash to what I want.
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