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That was the price for a complete engine rebuild new values so it could run on unleaded he would come and take out engine rebuild and refit engine all new parts it would be hard to pick up a good engine here in Ireland not a lot of humber super snipe here
If it is running reasonably evenly and the problem is the fuel
consumption, then there is a good chance that the engine doesn't
actually need a complete rebuild.
I used to own a 3-litre Rover which had 350,000 miles on the clock when
I finally sold it and even at that mileage it didn't need a rebore or
new bearings. I only sold it because I bought a house and for a while I
couldn't afford a car - any car.
Big 6-cylinder engines don't generally have to work hard enough to wear
out mechanically. Valves might burn and carburation and distributor
condition might need attention but none of these require a major rebuild.
Then there is the question of whether the mileage covered can ever
return the investment of hardened valves and valve seats to run
unleaded. For relatively low mileages there is the option of lead
which looks a bit expensive until you calculate it on the basis than a
bottle treats 100 gallons of fuel.
If you prefer leaded fuel because that is what the engine was designed
for, you can use real lead additive, eg
I would start at basic diagnostics - compression test and fuel burn
efficiency checks (eg with a Colourtune) and timing light jitter can
point to where to start. The other possibility that is often overlooked
is that the petrol you put in the tank might not all be getting to the
engine, but might be leaking slowly, through perished tubing or leaking
fuel pump or filter. Before assuming that the engine needs to be
replaced, I would do some good old-fashioned diagnostics. That way you
can tackle what needs repairing rather than taking the catch-all
approach that if you replace everything it must fix it. If you can't do
the diagnostics yourself there are still mechanics who can diagnose
faults without plugging a laptop into a car's electronics, so ask around.
Bear in mind that although a diesel engine might give more miles to the
gallon, it would need more frequent servicing and oil changes, and by
the time you have bought replacements for the current engine and exhaust
system and re-engineered all the fixings and mountings and perhaps
changed the gearbox and prop shaft if the current ones are not
compatible, you would need to do a huge mileage to recover the
expenditure by improved MPG figures. Also bear in mind that after such
a conversion, very few people who might buy a Super Snipe would want one
that far removed from the original specification.