I bought my motorhome in October 2002 and joined the walley club. Member Number 7006.
Here's what I've done to the big block. Some is prevenative maint. and the rest upgrades. I'll start with potential improvement comments and then note the completed work.
Went to the Galax ralley. During the drive I noted a large increase in pulling torque, especially when the stock cam comes on strong at 3000 rpm. Coolant temperatures at steady cruising with ac on and 85F dropped from 220F to 180F and below.
I think there's much more potential improvement for the spark timing and fuel delivery. For the spark I'm considering upgrade to '90 vintage or later stock GM engine management. Get the harness and ECU from a pick and pull. This would provide knock sensor referenced, spark mapped to RPM, load, temp, etc. instead of just mechanical/rpm and mechanical vacuum/load. There's cheap shareware and freeware out there to tune better than stock for these GM systems with a laptop and eprom burner. (WEB LINK Reference Reading - www.geocities.com/inexpensivepartsman/gm.html
It would also then be easy to swap to TBI for fuel. The quadrajet seems to be inefficient at lower RPM's. I like quadrajets but TBI is so much easier to tune/measure/monitor/change/adjust.
ac compressor - 134a swap also
power steering and brakes pump
oil cooler - used turbo volvo 740 unit and moved in front of passenger side wheel
oil cooler lines - Napa cloth brades hoses, approx. $4/ft.
spark plugs - bosch copper
spark plug wires - generic
rocker cover gaskets
oil cooler adapter gaskets
exhaust manifolds - headman headers from Summitracingonline
one pair flowmaster mufflers
DIY dual exhaust via 2.25" pipe and a torch
all coolant hoses
temp regulator - 180 installed
radiator cleaned and flow checked
fuel tank fittings resealed and rubber fuel lines replaced
coil, cap, rotor for dizzy
timing set to stock
Transmission cooler - same location as engine oil cooler
separate DC fan for transmission and engine cooler.
I'm considering installing a set of variable duration Rhoads lifters to improve torque responce below 300rpm.
Could I please have your comments, suggestions, question, concerns, advice, shared experiences regarding the 454 big block in a classic motor home?