Here's a bit of nostalgic info on the Jet valve http://books.google.ca/books?id=rwAA...0valve&f=false
Here's a bit of nostalgic info on the Jet valve http://books.google.ca/books?id=rwAA...0valve&f=false
Originally Posted by Andy 2
YA I would say 1978 is nostaligic, that magazine was a time warp for sure. Advertising a Pinto Station Wagon, lol
I used a kit on my old Mits head, best thing I did to that head was remove MCA jet valves and install a 20 dollar kit. They always seem to crack heads between them and whatever is closest to them. Great idea, but Mitsubishi just kept using inferior materials in their manufacturing. The normally known 8 valve head was strangely called the 12 valve head.
I'm wondering if by 1988 they had revised those things whereas if you are proactive with maintenance they really don't have a head cracking problem.
The reason I say that is I had a bad fan clutch and a leaking radiator at 150K or thereabouts that caused overheating and therefore a blown headgasket. I just replaced the gasket and kept on truckin'- there was no damage to the head even though it overheated into the red...that means it got HOT.
Mine are still in there and I see no reason to remove them i.e. "if it ain't broke don't bother"...just an 70s era emissions 'gimmick'.
The truck has spark knocked since day one with the factory carb and 2 different model Webers. (DCES and DGEV)...stock timing or retarded to 0' BTDC...which leads me to think it just needs 89-91 octane.
In other words they don't help nor harm in my 350K miles of experience.
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