1967 427 17.5" 5 blade fan
I noticed paragon sales a reproduction and says it is also for early 70's 17.5" fan corvettes. What is the difference between the early 70's and the 67 17.5" fans? Do the paragon reproductions pass judging for 67's?
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Re: 1967 427 17.5" 5 blade fan
Charles------
The fan blade assembly used for 1967 big blocks was GM #3888366. It is 5 blade, 17-1/2" OD. This same fan blade was used for all 1968, most 1969, and some 1970 Corvettes.
1971 and later Corvette fan blades are not interchangeable with 1970 and earlier. That's because the 1971 and later have a larger center hole (for larger fan clutch hubs to pass through) and larger bolt circle diameter for fan clutch attachment.In Appreciation of John Hinckley -
Re: 1967 427 17.5" 5 blade fan
Joe, does your data indicate 66 has a 17" fan and is not the same as the 67?Comment
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Re: 1967 427 17.5" 5 blade fan
Ronald------
The information I have indicates that 1966 427 used the same 3888366 fan as 1967. However, I suppose it's possible that early used the 3872792 used for 1965 L-78. The 3872792 was 17" OD; the 3888366 was 17-1/2" OD.In Appreciation of John HinckleyComment
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Re: 1967 427 17.5" 5 blade fan
When measuring these fans it is easy to lose a half inch. I have an original 17 and it barely fits without hitting. The Paragon repop at a reported 17.5 is known to be too large and some judges have noted differences in rivets, tip length, etc.Comment
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Re: 1967 427 17.5" 5 blade fan
I have the fan that LI sells, not sure if it's the same unit Paragon offers or not. There is no fitment issues with it, and the shroud is OEM. I did have an GM fan I tried to use (not sure of the original application, very similar to 3888366 but just about 18" dia.) which did not clear, so there is not a lot of room for variation.
SteveComment
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Re: 1967 427 17.5" 5 blade fan
Yes, measuring fan diameter is tricky! I lay the fan over a sheet of paper and draw lines connecting opposite mounting bolt holes to determine the fan center. Then, measure from the center point to the tip of each blade (expect some minor differences, blade to blade) and multiply each by two.
Add the five lengths and divide by five to get the average. It's quite difficult to distinguish between 17.0, 17.125 and 17.5 inch fan assy's...
On a given fan, say base engine 3770529, there are known running changes over time related to the style of rivet used to affix the blade to the center spider (rounded/mushroom head vs. flat/button head). But, that info is addressed in the applicable Judging Guide for the model years affected.Comment
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Re: 1967 427 17.5" 5 blade fan
STEVEN. Did you have the LI fan judged?Comment
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Re: 1967 427 17.5" 5 blade fan
Has anyone had a paragon fan reproduction judged and is it up to NCRS standards? Some fool paid a fortune for an original on ebay the other day and it is getter very hard for us little guys to restore anything.Comment
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Re: 1967 427 17.5" 5 blade fan
I went all over the place looking for a correct one, and then to Paragon and face to face they told me they knew the 66 fan blade was 1/2" too long and I've been told the good 66 427 judges know the difference. I saw a significant difference in the rivets...Comment
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Re: 1967 427 17.5" 5 blade fan
Ronald-----
By "...1/2" too long..." I don't know if you mean it's 17-1/2" or if it's 18". However, the GM #3888366 used for 1966-67 big blocks was 17-1/2". It was never less than that and never more than that. It's very easy to ID these fan blade assemblies as they have a "66" stamped in the center section.
As I mentioned previously, it's POSSIBLE that some early 1966 big block used the 17" GM #3872792 otherwise used for 1965 L-78. I don't know that happened, but I would say it's POSSIBLE.In Appreciation of John HinckleyComment
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Re: 1967 427 17.5" 5 blade fan
At 18" it's going to chew up your shroud and spit it out, the LI fan is at least the right diameter. No stampings on it however, most likely would be obvious to someone who knows what to look for, but like Charles said it's getting real hard to put these cars back together when you have to drop close to 1k for a dang fan. Oh well, isn't this fun?
SteveComment
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Re: 1967 427 17.5" 5 blade fan
Joe Steve, The correct fan has the 66. The Paragon fan will hit and you can carefully adjust it to clear.
If you overlay the Paragon fan with a 66 original - you'll pick up about 1/4 inch per side and thus the about 1/2 too big. I did (once) try and measure mine, came up with 17 and 17 1/2 depending. Knowing the 66 and front are stamped in, that is what it takes... to make a correct set up.
So the repops...lic included as the tooling for this was very expensive and they are trying to cover the largest usage:
a little too big
different rivet size appearance
no 66
no front
Find an original.
If you think that is high priced, carbs, shocks and AC lid assemblies fall into this same queue. Last night someone paid $500 for an almost original and they don't know yet if the lid even has or has the correct silk screening because the arrogant seller refused to disclose that information. Early ones were curved, later squared, this one, h'm.Comment
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Re: 1967 427 17.5" 5 blade fan
How about the guy who paid $234 for a temperature sending gauge. Any one have a clue why someone would pay so much? It had an upside down "AC made in USA" but sounds like madness to me.Comment
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