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My recollection from back in the day, there was no difference in the material in the exhaust port, just at the valve seat area. But of course my die grinder didn't care. I should look at what's still on my shelf, I think I have an example of each.
I'm not sure how the foundry would know what the application would ultimately be, so how would they know which letter to cast?? My observation is that there was no difference between low & HP other than the valve size they were cut for. I have had a number of sets of each.
As a drag racer, I did just as you said. I did whatever level of porting I wanted and cut them for 2.14/1.81" valves. But that's a drag racer approach. If you are a resto person you look differently. As I understand it the small valve version was most common on the C body cars.
Post #5 makes a very good point regarding the 915 head castings. There are two versions, there low perf with the 1.60 exhaust valve and the HP with the 1.74 exhaust. It's possible some late '66 cars got some low perf 915's or maybe even some very early '68's. The '69 motors were well into the...
Put floor jack under the housing, the rotate a tire, if both tires turn in the same direction, it is a limited slip. Then rotate the tire one revolution while counting the number of revolutions the pinion makes. That tells you the gear ratio, no matter where the car was built.
IIRC in the late '60's & 'in 70's lots of dealers outsourced cars to specialty shops prior to delivery. Some "special packages" seemed pretty available.
Leaving the red functional. Redundancy is a good thing. I attached a big red light to the shift lite to warn me if I lose oil pressure. But my Satellite is mostly a drag car.
6 Pak's were generally not good runners from the factory. That's why I could get many at reasonable prices in the mid '70's. Make sure you don't have any vacuum leaks and float levels are close. Then tuning involves usually the end carb idle mixture screw adjustment, hidden behind plugs in the...
Seems like 3 speed is very uncommon. The 4 spd was standard in '68 & '69 as I recall. Insurance rates changed dramatically in '70 so maybe there was some demand.
Yes that oil pan would use the stock style oil pump & pickup. Not sure about the baffling in that pan or which body style it fits, Summit doesn't say which.
The Melling M63HV is the "high volume" version of there standard BB replacement oil pump which uses the stock internal pickup and oil pump suction supply passage, stock oil pan. The Milodon system has a special pickup which requires a special external pickup oil pan, and the oil pump cover in...
Don't know what model car you're working with. The air cleaners & exhaust manifolds vary with the car model & performance level. I think the alt & PS brackets are the same year to year, but I think different if the motor had AC, may be wrong.
I understand & completely agree that the insurance paid the pre-fire value, like I said hope my insurance would do that well. My comment on the value was directed at current condition and what I apparently misunderstood was the asking price, not the insured value.