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#1
07-04-2026, 05:15 PM
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Holley Jet Extensions and Fuel Bowl Removal
First Happy 4th to all!
Second, I have installed Jet Extensions on the Secondary Side of Holley 750 DP (4779-6). However, in order to change jets at the track I need to remove both the fuel bowl and the metering block as the PCV fitting on back of the carb blocks my ability to remove just the float bowl. Anyone else have this issue or is this normal? Thanks DV
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1965 GTO Cameo White, Red Interior - 389, ST300 numbers matching 1965 GTO Black, Black Interior "Post" car - 389, M-20 numbers matching 1965 GTO Silver, Black Interior 100% dedicated drag car w/1968 400(461), 16x Heads, TH400, 3.90 9" Rear 1.656 60' 7.566 90.057 (1/8th) 1971 GTO Black (orig. Quezal Gold), Gold Interior - 400, TH400 numbers matching 1972 GTO Cardinal Red, Black Interior - 455, TH400 almost numbers matching |
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#2
07-04-2026, 05:24 PM
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Is it just the tubing or do you have a screw in fitting in the baseplate. I have had some that were tight and even filed a slight notch in the fuel bowl right there. Even a rubber cap makes it tight.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune [email protected] 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
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#3
07-04-2026, 05:46 PM
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Wise ass reply here somewhat, so smack me if you want.
Switch back to a Q-jet and then you only need to remove one little 6/32 screw to swap out the secondary metering rods or move them into a different set of holes you can drill in the rod hanger, or even just shim the hanger up or down and keep using the same set of metering rods. On a track that’s hooking up like crap you can also slow down the opening rate of the secondary’s. To keep the Holley you might be able to do this . Cut off the nipple for the pcv and drill & tap it for a pipe plug. Then mod the intake so you can drill & tap a new vacuum hole you add a screw in nipple to for you pcv line.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 07-04-2026 at 05:55 PM. |
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#4
07-04-2026, 07:25 PM
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Skip Fix - The carb has the tube
steve25 - I like your modification idea. Will look into that for sure. Nothing against Quadrajet as I am running them on my 71 & 72 street cars, I think I will stick with the Holley for now.
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1965 GTO Cameo White, Red Interior - 389, ST300 numbers matching 1965 GTO Black, Black Interior "Post" car - 389, M-20 numbers matching 1965 GTO Silver, Black Interior 100% dedicated drag car w/1968 400(461), 16x Heads, TH400, 3.90 9" Rear 1.656 60' 7.566 90.057 (1/8th) 1971 GTO Black (orig. Quezal Gold), Gold Interior - 400, TH400 numbers matching 1972 GTO Cardinal Red, Black Interior - 455, TH400 almost numbers matching |
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#5
07-05-2026, 08:40 AM
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Most times I just remove the carb for jet changes so I'm not spilling gas on the engine. Never fails even if I drain the bowl there is still residual that runs down the intake and stains everything.
I've got carb removal down to a minute or two and just became much easier for me to do it that way, with no mess. |
| The Following User Says Thank You to Formulajones For This Useful Post: | ||
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#6
07-05-2026, 09:48 AM
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Another option buy and HP Baseplate that does not have the nipple.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune [email protected] 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
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#7
07-05-2026, 01:18 PM
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Formulajones - a minute or two, you do definitely have that down to a science. It takes me longer than that to get all my tools out at the track, lol.
Skip Fix - thats an idea but hopefully will be needing to upsize the carb (which came with it when I bought it) in the future and will definitely make sure I dont have the same issue with the next one.
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1965 GTO Cameo White, Red Interior - 389, ST300 numbers matching 1965 GTO Black, Black Interior "Post" car - 389, M-20 numbers matching 1965 GTO Silver, Black Interior 100% dedicated drag car w/1968 400(461), 16x Heads, TH400, 3.90 9" Rear 1.656 60' 7.566 90.057 (1/8th) 1971 GTO Black (orig. Quezal Gold), Gold Interior - 400, TH400 numbers matching 1972 GTO Cardinal Red, Black Interior - 455, TH400 almost numbers matching |
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#8
07-06-2026, 09:25 AM
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Just get a file or dremel and take a little off the edged of the bowl.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune [email protected] 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
| The Following User Says Thank You to Skip Fix For This Useful Post: | ||
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