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HGV8 Offline
#1 Posted : Sunday, 17 November 2019 11:35:50 AM(UTC)
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Question for the carb guys.
I have a pre pollution 308 early HQ quadrajet on my 253 HG.
I want to change primary jets from 76 to 70’s to suit the 253’s smaller capacity.
Question is, Do I also have to change the 308 45B metering rods or will they be ok to stay?
Any help appreciated
j.williams
HK1837 Offline
#2 Posted : Sunday, 17 November 2019 11:58:21 AM(UTC)
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Just copy what is in a WB or VC-VK. Or buy a rebuilt carby off one of them.
From memory on an XT5 engine has the same secondaries for 4.2 and 5.0 but primaries are different. Look in WB parts book.
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HGV8 Offline
#3 Posted : Sunday, 17 November 2019 12:22:19 PM(UTC)
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Already has the correct CX secondary’s. A lot of confusing info out there but have sort of established that the blue 253 used 70 jet’s but can’t find any info on the correct primary metering rod’s.

Edited by user Monday, 18 November 2019 9:06:07 AM(UTC)  | Reason: Not specified

j.williams
justgm Offline
#4 Posted : Monday, 18 November 2019 4:59:08 AM(UTC)
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Hi HGV8 , 49-P is the metering rod you need. Thanks Mark.
life is good in "Wine & Holden Marlborough "
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HGV8 on 18/11/2019(UTC)
gm5735 Offline
#5 Posted : Monday, 18 November 2019 8:22:52 AM(UTC)
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I suggest you talk to Mick at MLP Carburettors. You will get the right answer.
Smitty2 Offline
#6 Posted : Monday, 18 November 2019 8:46:51 AM(UTC)
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Originally Posted by: justgm Go to Quoted Post
Hi HGV8 , 49-P is the metering rod you need. Thanks Mark.


correcto... the 'blue' 2fiddy3s with Quaddies used these

don't use the 45s, a .045" rod has a rod diameter of .045" (and a small diameter "power tip" of .026")
The larger (.045" or .049") section of the rod is positioned in the metering jet during light throttle
operation and needs to be matched to the primary jetting used on whatever engine. A 45 rod is wrong size

hth

Club circuit racing...the best fun you can have with your pants on
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HGV8 on 18/11/2019(UTC)
Smitty2 Offline
#7 Posted : Monday, 18 November 2019 8:51:57 AM(UTC)
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Originally Posted by: HK1837 Go to Quoted Post
Just copy what is in a WB or VC-VK. Or buy a rebuilt carby off one of them.
From memory on an XT5 engine has the same secondaries for 4.2 and 5.0 but primaries are different. Look in WB parts book.


HK... the secondarys use a different coded rod .. CX (4.2) v DP (5.0)
on blue/silver/black XT5 Improved Performance engines

but actually, a CX rod is the better of the 2 GMH used. I use them in
308 Quaddies I build as they have a better 'power transition' to WOT
(aka less bog)



Club circuit racing...the best fun you can have with your pants on
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