When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
67 SB coupe. i'm having a hard time finding a replacement choke coil and rod for a 490 aluminum intake (327/350). the vendors are either selling universal replacements or the specific parts aren't correct. or there isn't enough info in the part description to know. in referencing this thread over at the other board it looks like i need something that corresponds to these GM part #'s
choke coil - 3887418
choke rod - 3881888 3.36"
i think these numbers have been discontinued or superseded. is it possible to find replacements that work? thanks. https://www.forums.ncrs.org/showthre...cement-3887148
ps. i've seen some oem parts on evilbay but the prices are insane.
the choke rod i got from paragon after talking with them is 3/4" to long. not enough info in the LIC catalog. will start calling vendors tomorrow and see if they'll put hands on the item and measure. the problem i'm having with the coil is that apparently they're are at least two depending on whether the intake is aluminum or iron. possibly something to do with heat transfer. also, some coils pull the rod and some push depending on application.
the choke rod i got from paragon after talking with them is 3/4" to long. not enough info in the LIC catalog. will start calling vendors tomorrow and see if they'll put hands on the item and measure. the problem i'm having with the coil is that apparently they're are at least two depending on whether the intake is aluminum or iron. possibly something to do with heat transfer. also, some coils pull the rod and some push depending on application.
I think I may have NOS bimetal spring and the correct L79 choke rod (perhaps the cover, too). Will check my stash later today & send you a PM if I find same. Meantime, confirm you have the correct Holley carb, no Bubba stuff.
nowhere man, the rod i got from paragon would have to be bent enough to shorten it 3/4" or more. in fact, with the choke closed the bottom of the rod would extend below the choke stove. i'm sure it could be done but seems a bit extreme.
vark, thanks, the carb is a 3810.
in the first pic i have the choke held closed and you can see that the current choke rod is way to short. the second pic is with the paragon part. the choke is in the closed position and the end of the rod extends below the choke stove.
As I recall, the bottom of the rod is just a slide in fit in the spring eye. If the rod is 3/4" too long, I would cut it off and bend a new end to slide into the spring. It it hidden, thus Only the Shadow Knows. Of course I have been accused of being BUBBA's Grandfather.
3154tm,
See if this picture helps you out. This is the correct set-up. Look at the two other rods involved with the choke set-up in your pictures. The one from your vacuum pull off appears to be bent too much. I can't see enough of the rod that attaches directly to the choke butterfly but it appears to be at a weird angle in your picture.
Your new rod is definitely the incorrect length...way too long. Your original rod appears to be correct.
Last edited by leif.anderson93; Dec 22, 2020 at 08:20 AM.
1. Choke coils are wound in two different directions depending on model and year. And they act in reverse upon engine heating. Make sure you have the right one. Folks have been known to buy (or be sent) the wrong one.
2. The rod between the coil and the carb is also different lengths depending on carb and intake manifold. Measure what you have now and maybe someone can either confirm it is right or provide the correct length. You can also estimate what is required if you have the correct choke coil and a ruler. Or simply buy one from another vendor and try it. Paragon has side by side pics of the various rods in their catalog. LICS may have lengths specified on their website. I will try and measure mine for you today.......I have a 67 327/350 HP engine with #3810 carb and factory aluminum manifold.
leif, i haven't gotten as far as the vacuum pull off yet, that's next. i think the current choke rod is a 3881866, it measures about 2.8". not positive but i think it should be the 3881888 at 3.36". that's about how much longer the rod on there now needs to be to be able to close the choke all the way.
larry, a measurement would be great! from what i've read over on the other board and elsewhere there are also differences in coils based on whether the intake is iron or aluminum. i believe the coil i have now is correct for an iron intake on a 327/300 w/ holley carb. in the relaxed/cold position it has the choke rod all the way up. i'll just have wait and see if it will travel far enough to open the choke all the way and whether it will do it soon enough on a 490 intake. i talked to a paragon rep and they don't have the correct replacement length rod. apparently, i'm not the only one that's mentioned this to them. LICs lists one in their catalog but i'd have to get them to measure it.
thanks guys.
Spring coil will push rod up when cold, and will draw rod down as engine heats up. My linkage rod appears to measure 3-1/4 inch long. It could be as long as 3-3/8 inch.......since I did not remove it from the coil and carb, and just did my best "tape measure" measurement with the rod connected. This is vertical distance and does not include any rod length that goes horizontally.
larry, that sounds like it's right on the money according to the chart referenced in the first post.
thanks and merry Christmas, i hope you and yours are well.
frank
credit where credit is due. apparently i wasn't the only one that complained about the choke rod length for that particular part number so paragon had one of their techs fabricate a small batch and sent one to me. it's slightly longer than the spec but looks like it should work. won't know until i get it running and up to temp. right now i've got the timing cover off to do the front seal.
Divorced Choke
Or simply buy one from another vendor and try it. Paragon has side by side pics of the various rods in their catalog. LICS may have lengths specified on their website. I will try and measure mine for you today.......I have a 67 327/350 HP engine with #3810 carb and factory aluminum manifold.
and Merry Christmas. 