We got a RV recently, It is a 1983 E350 with the 460.
It was purchased from the original owner who was a drag boat racer.
He did not like to be passed on the hills while towing his drag boat.
So he did the following Stock carb mounted ( he lived in Calif so did not change carb to pass smog check) on an Edlebrock Performer intake Manifold along with a Edlebrock performer cam #2167.
The stock heads were ported and a set of Thornley Tri Ys installed. 3inch collector about 12 inches long going to dual with cross over and2.5 inch pipes with a set of sorta straight thru mufflers.
I have been thinking of going to 3in all the way back with a set of Magna flow straight thru mufflers..
Stock Duraspark ignition. Might change to a HEI module I did this with my FSJ Jeep 360 and it ran much better than with the Duraspark.
It pulls a 6% grade at 65-70 mph with no knocking ( Running 87 gas), but my normal driving is 55-60mph @ 15 in of vacuum.
I am looking to find out what timing I should set it at? Do I plug the vacuum lines when setting the timing?
My goal is to improve gas milage as even a slight bit will help.
Do NOT install 3" dual exhaust on an RV it will hurt torque and Throttle response AND throttled torque. Actually 2.5" is a bit big for a near stock engine.
Did the previous owner install straight up timing set?
D3 heads need about 35 to 36* total timing for best power. In an RV delay that until about 3200 ish.
If no EGR vac advance limited to about 10 to 13* to start adding more after testing.
OEM cam would mean that 12 to 14* initial timing is fine.
RV's are one use where we use the OEM style dual stage advance springs when we set the distributors up on our Sun machine.
Recurve procedure from our porting and BBF info website.
Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
"Parkland Performance Auto Machine" Formerly RHP
Parkland Auto Machine