Holley 600 Jetting ??!!.
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  1. #1
    Worn Out Fanny Magnet. Mike Hunt's Avatar
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    Holley 600 Jetting ??!!.

    Hi all,

    Similar to another Thread on here at the moment ; - I have a Rover 4.6 V8 engine, Fast Road Cam, (but unsure which one :****er, & looks like Mildly Ported Heads, which is powered by a Holley 600 cfm Carb, (Vac 2nd`s), sitting on an Offy 360 Manifold. I bought the Carb "as new" straight from the States, (Bargain!!), and it is in fact fine. But, it was previously fitted to a Chevy 350 ci Motor, and although seemingly OK on the Road, (in fact Acceleration is Brutal !!), on Tickover when Warm, its obviously running too Rich. Can anyone please advise me of what Size Jets to us to suit the 4.6 V8 Lump ??!!.

    Thanks.
    I want to Die Peacefully in my Sleep like my Dad, not Screaming like the other Passengers on his Bus !!.

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    Col
    Heavy Oiler Col's Avatar
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    Tickover mixture is done on the mixture screws
    https://www.rodsnsods.co.uk/forum/signaturepics/sigpic2162_1.gif Now off the road for body off rebuild. Will have blown bigblock & 5 spd gearbox.

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    Worn Out Fanny Magnet. Mike Hunt's Avatar
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    Quote Originally Posted by Col View Post
    Tickover mixture is done on the mixture screws
    Yeah, so I have just discovered, I`ll just put it down to the amount of Pressure I`m under at the moment !!.
    I want to Die Peacefully in my Sleep like my Dad, not Screaming like the other Passengers on his Bus !!.

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    Rods 'n' Sods Junkie
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    Man that carb is to big no matter how you jet it like I tell my wife bigger ain'y always better

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    Worn Out Fanny Magnet. Mike Hunt's Avatar
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    I`ve been looking at different options regarding how to solve my little Dilemma, as I`m just not happy with the Holley 600 cfm on my Rover 4.6 V8 lump, no matter how its adjusted, and I`m sure I can do much better Fuel Economy wise too. So, I was looking at swapping over to an Edelbrock 1404 500 cfm Carb, for which I`ve placed an Ad in the "Stuff Wanted" section. BUT, having delved a bit deeper, I`ve now realized that the Flow Rates on Holley`s & Edelbrock`s/Weber`s are Calculated in very different ways, i;e - Holley 600 cfm = As near as F#ck it 600 cfm. Edelbrock/Weber 500 cfm = More like only 400 cfm, hence much more suited to the Rover 3.5 V8 lump, in either Standard or Mild Tune, as is the Holley 390, as a Standard 3.5 V8 requires around 365 cfm.

    I have now found for sale a Holley 450 cfm 4 Barrel, with Vac 2nd`s, which by my reckoning, "Should" actually fall nicely in between the Holley 390 & 600 cfm models, and be pretty near the mark for what my 4.6 V8 lump "ideally" needs, but before I go jumping in with my Size 11`s, your Comments & Opinion`s are as always much appreciated, and ALWAYS taken on board !!.
    I want to Die Peacefully in my Sleep like my Dad, not Screaming like the other Passengers on his Bus !!.

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    1.1/4 inch SU. holley carb in the bin. LOL

  9. #7
    Worn Out Fanny Magnet. Mike Hunt's Avatar
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    Quote Originally Posted by Fordson Van View Post
    1.1/4 inch SU. holley carb in the bin. LOL
    Ha, ha, you could well be right there !!, as I would never have ended up even thinking about this problem with the old Twin SU`s fitted !!. Lol.
    I want to Die Peacefully in my Sleep like my Dad, not Screaming like the other Passengers on his Bus !!.

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    funnier than you think! a 1.1/4 SU is off a mini 1000!

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    Worn Out Fanny Magnet. Mike Hunt's Avatar
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    Quote Originally Posted by Fordson Van View Post
    funnier than you think! a 1.1/4 SU is off a mini 1000!
    Yep, I know, I`ve handled plenty of SU Carbs in the past, on Minis to Maxi`s to Rover V8`s, etc, etc. Saw one on a Ford Transit V4 Engine the once, with a weird conversion to get it to fit the Inlet Manifold !!. Still worked ok though !!.
    Last edited by Mike Hunt; 03-07-2011 at 10:29.
    I want to Die Peacefully in my Sleep like my Dad, not Screaming like the other Passengers on his Bus !!.

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    I convered a mk1 ford escort 1300 a long time ago! actually 1978 eek! for a friend,it was unbelievably economical and pulled like
    a little train.

    A brilliant design employing a method called "static venturi" by a company called "skinners union" - SU in about 1904,to my mind one of the best mechanical inventions to date : )
    Last edited by Fordson Van; 03-07-2011 at 08:47.

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