whatsnext lars?
Thread Starter
Intermediate
Joined: Mar 2001
Posts: 48
Likes: 0
From: Brampton Ontario Canada
whatsnext lars?
lars, you told me what sixe jets and metering rods to get for my Q-jet to solve my problem of 7 turns on the air/fuel mixture screws. To my suprise the speed shop tells me that they can get the jets but there is no listing for a late model metering rod that size. They are only available for the early carbs. What should I do now? I think you told me 72-74 jet size and 43-46 metering rods. :rolleyes:
Tech Contributor
Joined: Aug 1999
Posts: 14,377
Likes: 6,377
From: At my Bar drinking and wrenching in Lafayette Colorado
Re: whatsnext lars? (Joe 80)
Joe -
Sorry I missed your post earlier and just now saw your request for info...
If you don't have a stash of used jets and rods laying around, you'll have to do your jetting within the limits of available aftermarket parts. Main metering rods are available new from Edelbrock under the following part numbers and sizes (you can order them through your local NAPA store or other supply house):
1974 and earlier 4MV Carbs, single taper rods:
Part Number and size
1936 - .035"
1937 - .037"
1939 - .039"
1942 - .041"
1944 - .043"
1946 - .045"
1975 and later M4M Double Taper Rods:
Part Number and size
1941 - .048"
1943 - .050"
1945 - .052"
1947 - .054"
Summit Racing also has them in their catalog for mail order. The Summit part numbers are the same except they put "EDL" in front of the part number shown. Price is $6.99/pair.
Using available sized rods, you can still obtain the same metering area by tailoring the main jet to match the rod. If you send me my earlier recommendation for jet/rod combination, I can give you a jet/rod combo using the available rod sizes that will produce an identical metering area at idle/cruise.
Sorry I missed your post earlier and just now saw your request for info...
If you don't have a stash of used jets and rods laying around, you'll have to do your jetting within the limits of available aftermarket parts. Main metering rods are available new from Edelbrock under the following part numbers and sizes (you can order them through your local NAPA store or other supply house):
1974 and earlier 4MV Carbs, single taper rods:
Part Number and size
1936 - .035"
1937 - .037"
1939 - .039"
1942 - .041"
1944 - .043"
1946 - .045"
1975 and later M4M Double Taper Rods:
Part Number and size
1941 - .048"
1943 - .050"
1945 - .052"
1947 - .054"
Summit Racing also has them in their catalog for mail order. The Summit part numbers are the same except they put "EDL" in front of the part number shown. Price is $6.99/pair.
Using available sized rods, you can still obtain the same metering area by tailoring the main jet to match the rod. If you send me my earlier recommendation for jet/rod combination, I can give you a jet/rod combo using the available rod sizes that will produce an identical metering area at idle/cruise.
