Holley 600 Jetting ??!!. - Reply to Topic
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Topic Review (Newest First)

  • 03-07-2011, 09:38
    Mike Hunt
    Now dont laugh, but I had an Allegro 1750 ss in the mid 1980`s as a runaround, which was around 10 Years old at the time. Twin SU set up, ditched the original Air Filter Box, and stuck on a couple of little round Chromie`s, and it went like stink, especially for the time !!.

    Anyway people, dont forget to talk to me about the Edelbrock 1404 500 cfm, and the Holley 450 cfm.
  • 03-07-2011, 07:43
    Fordson Van
    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 : )
  • 02-07-2011, 22:18
    Mike Hunt
    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 !!.
  • 02-07-2011, 21:39
    Fordson Van
    funnier than you think! a 1.1/4 SU is off a mini 1000!
  • 02-07-2011, 21:26
    Mike Hunt
    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.
  • 02-07-2011, 21:12
    Fordson Van
    1.1/4 inch SU. holley carb in the bin. LOL
  • 02-07-2011, 16:58
    Mike Hunt
    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 !!.
  • 29-06-2011, 19:45
    Man that carb is to big no matter how you jet it like I tell my wife bigger ain'y always better
  • 27-06-2011, 19:09
    Mike Hunt
    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 !!.
  • 27-06-2011, 17:34
    Tickover mixture is done on the mixture screws
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