Slant Six age and size?

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On the peanut head being heavier
The original peanut heads definitely were, vs the drool tube ones. The latest of them in the 80s though I believe they shaved some weight from.
I was at another FABO members garage last summer with the head that is on my engine, and he had a few /6 heads on a work bench, some good and some junk (experimental, ruined by excessive porting) he invited me down to run mine on a flow bench, just for comparison sake. My '77 head was the heaviest of the bunch. He had a drool tube head, and a couple of newer peanut heads, as I remember one was from an 80s pickup truck engine. That 80s head was a peanut plug one as mine is but was much lighter than the one that I brought down.
I lifted mine onto the flow bench, and while he was setting it up suggested that I check out the heads on the bench that was against an adjoining wall. As I flipped them over to look at the features he wanted me to see, I noticed right away how much difference there was in heft.
In my case I don't care about how much heavier my head that's now on my engine is, as mine is going into a pickup truck in which case a few pounds here and there won't mean much like it would in a car that gets raced.
I'm also going from a cast crank to a forged crank motor, and the oil pump I bought for it is cast iron where the one on my truck is aluminum. If I were looking to shave every 1/10 of a second off of a track time, I'd worry about it more
 
Badvert65 said:
There is no real difference between a 77 engine and a 72 engine. You shouldn't be disappointed.
jus sayin......
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Well,that depends on what you are working on .A 77 has small spark plugs and a cast crank a 72 is forged and it is more similar to an early motor in looks.For someone restoring say a 65 slant six car these things are major issues . Not everyone is building a hot rod where this stuff doesn't matter.
 
Yeah, but you can put either style head onto either a cast crank block or a forged crank block. You can't see which crank is which when it's in the car or truck. Unfortunately "numbers matching" isn't as important to a /6 car's value as it would be an original Hemi car.
It'll run fine with either the 72 or the 77 block, I have a drool tube head collecting dust you can have if close by (Chicago area, about an hour south)my 74 head looks identical to a 72 head.
 
volaredon said:
Yeah, but you can put either style head onto either a cast crank block or a forged crank block. You can't see which crank is which when it's in the car or truck. Unfortunately "numbers matching" isn't as important to a /6 car's value as it would be an original Hemi car.
It'll run fine with either the 72 or the 77 block, I have a drool tube head collecting dust you can have if close by (Chicago area, about an hour south)my 74 head looks identical to a 72 head.
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Some of us like it to be factory correct some like you don't care.It's not always about cash value .
 
I didn't think the peanut head started until 78/79. I don't really know but It is probably in Doug's book.
 
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