Carb size ?
+ Reply to Thread
Page 1 of 3 1 2 3 LastLast
Results 1 to 14 of 30

Thread:
Carb size ?

  1. #1
    Senior Member propless's Avatar
    Join Date
    Dec 2007
    Location
    Clovis, Cali
    Posts
    623

    Default Carb size ?

    Hi guys , I have a mild 460 BBF with an Offy duel 4 t/r (the one that has a divider in the plenum kinda like a duel plane). The motor has 11 to 1 cr ported heads and the cam is 565 lift 280 dur (232 at .050) and 108 deg lobe center.

    I need to make a decision about carbs. A few people have recommended the Holley 450 mech sec, and others say go bigger than that, what do you guys think ?? I do have one Holley 750 vac sec (3310s) and I could pick up another one of those if you think that will work ?

    The boat is an 18' jet, 2 seater, not a family boat just a toy

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Driver 78CoLeBBF's Avatar
    Join Date
    Apr 2008
    Location
    Golden Shores,AZ
    Posts
    3,195

    Default

    i had duel 450 on my old motor worked beter than 2 650 dp een with alot of tuning with setups it was a 466 bbf 12-2 comp big hyd flat tappet scj heads my intake was weiend tr
    Its a FORD thing chevy's arent quick enough to understand

  4. #3
    Senior Member
    Join Date
    Jul 2008
    Location
    Kingman/Golden Vly, Az
    Posts
    1,278

    Default

    Quote Originally Posted by propless View Post
    Hi guys , I have a mild 460 BBF with an Offy duel 4 t/r (the one that has a divider in the plenum kinda like a duel plane). The motor has 11 to 1 cr ported heads and the cam is 565 lift 280 dur (232 at .050) and 108 deg lobe center.

    I need to make a decision about carbs. A few people have recommended the Holley 450 mech sec, and others say go bigger than that, what do you guys think ?? I do have one Holley 750 vac sec (3310s) and I could pick up another one of those if you think that will work ?

    The boat is an 18' jet, 2 seater, not a family boat just a toy
    u might want to try a couple Edelbrock 600/625's...Fords seem to like them...i have a few friends that run them on reg 460's (sgl) & love them...they have vac sec (built in) and with the small pri, give exellent response...the 450's are also an excellent choice ...just my .02 cents

    FastRat

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member Marcsrollin's Avatar
    Join Date
    May 2008
    Location
    El Cajon , Ca
    Posts
    574

    Default

    I am running 2 750 vac sec's on my mild 460 with a weind ram and it works GREAT!
    No matter how good she looks , someone is tired of her shit!

  7. #5
    Senior Member propless's Avatar
    Join Date
    Dec 2007
    Location
    Clovis, Cali
    Posts
    623

    Default

    Thanks for the help guys, looks like I might try the 2 750s (cheaper, only need to buy one) and if that doesnt work out then get the 450s





    Quote Originally Posted by Marcsrollin View Post
    I am running 2 750 vac sec's on my mild 460 with a weind ram and it works GREAT!
    Mark, I know your boat runs good, but arent you carbs mounted sideways ? I thought it was bad to side mount vac sec carbs.

  8. #6
    Senior Member
    Join Date
    Jul 2008
    Location
    Kingman/Golden Vly, Az
    Posts
    1,278

    Default

    Quote Originally Posted by propless View Post
    Thanks for the help guys, looks like I might try the 2 750s (cheaper, only need to buy one) and if that doesnt work out then get the 450s







    Mark, I know your boat runs good, but arent you carbs mounted sideways ? I thought it was bad to side mount vac sec carbs.
    1st...let me say, that the 3310 u have is NOT a 750cfm carb...it is a 780cfm vac sec carb!!!

    2nd...if they work for Marc, they should work for u

    3rd...IMO, side mounting carbs is a PITA...if u dont get them rite, ur gonna have nothing but trouble!

    4th...if u go with the 3310, i might have 1 laying around that u can have for shipping cost!

    just my .02 cents & HO

    FastRat

  9. #7
    Senior Member propless's Avatar
    Join Date
    Dec 2007
    Location
    Clovis, Cali
    Posts
    623

    Default

    FastRat, Are you sure about the 3310s beeing a 780 ? It said 750 on the box when I bought it, its about 5 yrs old and is the shiney silver one (actual number on the choke tower is 3310-6).

    Sorry if the s caused some confusion but thats the number on the box

  10. #8
    Senior Member
    Join Date
    Jul 2008
    Location
    Kingman/Golden Vly, Az
    Posts
    1,278

    Default

    Quote Originally Posted by propless View Post
    FastRat, Are you sure about the 3310s beeing a 780 ? It said 750 on the box when I bought it, its about 5 yrs old and is the shiney silver one (actual number on the choke tower is 3310-6).

    Sorry if the s caused some confusion but thats the number on the box
    according to www.MorTec.com all 3310's are 780cfm...that web site also lists all the popular Holley carbs...ck it out ...i have no clue why the box would list it as a 750!...the 1 i have is rather old, maybe 30yrs+ & perhaps the newer one's "are" 750's!...does urs have a metering block in the rear? or a metering plate?

    FastRat

  11. #9
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,814

    Default

    Quote Originally Posted by FastRat View Post
    according to www.MorTec.com all 3310's are 780cfm...that web site also lists all the popular Holley carbs...ck it out ...i have no clue why the box would list it as a 750!...the 1 i have is rather old, maybe 30yrs+ & perhaps the newer one's "are" 750's!...does urs have a metering block in the rear? or a metering plate?

    FastRat
    Hey Fast Rat, In the 70s the original list 3310 was in fact a 780 cfm. Then came the 3310-1 and the 3310-2. Those are listed as a 750 cfm carb. Evoloution and the carbs shrunk!!! Funny thing is the dimentions and flow is the same on both. As far as running any vac sec on a tunnel ram goes, be ready to take carb tuning 101. I have done it and it will work with attention payed to the vac can springs and squirter size. M

  12. #10
    Senior Member
    Join Date
    Jul 2008
    Location
    Kingman/Golden Vly, Az
    Posts
    1,278

    Default

    Quote Originally Posted by ol guy View Post
    Hey Fast Rat, In the 70s the original list 3310 was in fact a 780 cfm. Then came the 3310-1 and the 3310-2. Those are listed as a 750 cfm carb. Evoloution and the carbs shrunk!!! Funny thing is the dimentions and flow is the same on both. As far as running any vac sec on a tunnel ram goes, be ready to take carb tuning 101. I have done it and it will work with attention payed to the vac can springs and squirter size. M
    Hey ol guy...
    thnx for clearing that issue up...i knew i wasn't bumping my head!...i think u could run 1850's inline & they would work?...i agree, running vac's sideways could be more of a headache than its worth...also...back in the 60's, Ford ran 2 715/735cfm's vac sec on there 427's inline with the vac cans connected with a hose/tube...i used to have a set, but they got away somewhere lol ...MPO is, try a set of Edelbrock 600/625"s...could be "pleasently" surprized!

    FastRat

  13. #11
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,814

    Default

    Quote Originally Posted by FastRat View Post
    Hey ol guy...
    thnx for clearing that issue up...i knew i wasn't bumping my head!...i think u could run 1850's inline & they would work?...i agree, running vac's sideways could be more of a headache than its worth...also...back in the 60's, Ford ran 2 715/735cfm's vac sec on there 427's inline with the vac cans connected with a hose/tube...i used to have a set, but they got away somewhere lol ...MPO is, try a set of Edelbrock 600/625"s...could be "pleasently" surprized!

    FastRat
    Man I bet you wish you had those 735s back. I remember the set up with the vac can equlizer tube and single feul inlet with the secondaries being feed by the pass side tube. Someone doing a restore on an old 427 hi-riser would give eye teeth to have an original set. YES the good ol 1850 holley inline would be perfect for the ford. But as you say don't count out the reborn afb carbs either. M

  14. #12
    Senior Member
    Join Date
    Jul 2008
    Location
    Kingman/Golden Vly, Az
    Posts
    1,278

    Default

    Quote Originally Posted by ol guy View Post
    Man I bet you wish you had those 735s back. I remember the set up with the vac can equlizer tube and single feul inlet with the secondaries being feed by the pass side tube. Someone doing a restore on an old 427 hi-riser would give eye teeth to have an original set. YES the good ol 1850 holley inline would be perfect for the ford. But as you say don't count out the reborn afb carbs either. M
    ol guy...
    a better one than that...back in the late 60's early 70's, i was in the process of building a 432ci from a 406 block & had a "new" set of Tunnel port heads & 2x4 TP manif ...i paid a good price back then & the last set i seen on EBay went for 7k+...i sure wish i had them now ...my engine builders garage & house got broken into & everything got stolen (ex ole lady had something to do with it)...i got insurance $$ for what was stolen, but put me out to lunch on that project...cried for a long time

    FastRat

  15. #13
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,814

    Default

    Man what a heart breaker. The ol days of the good ford stuff. Back when FOMOCO actually gave an attempt at serious racing thanks to nascar and guys like the Legendary Bob Glidden, and yes there is more. Mark

  16. #14
    Senior Member propless's Avatar
    Join Date
    Dec 2007
    Location
    Clovis, Cali
    Posts
    623

    Default

    Hmmmm , Interesting stuff, 3310's are 780's and 750's and both are the same size and flow the same .

    according to www.MorTec.com all 3310's are 780cfm...that web site also lists all the popular Holley carbs...ck it out ...i have no clue why the box would list it as a 750!...the 1 i have is rather old, maybe 30yrs+ & perhaps the newer one's "are" 750's!...does urs have a metering block in the rear? or a metering plate?

    FastRat
    Hey ol guy...
    thnx for clearing that issue up...i knew i wasn't bumping my head!...i think u could run 1850's inline & they would work?...i agree, running vac's sideways could be more of a headache than its worth...also...back in the 60's, Ford ran 2 715/735cfm's vac sec on there 427's inline with the vac cans connected with a hose/tube...i used to have a set, but they got away somewhere lol ...MPO is, try a set of Edelbrock 600/625"s...could be "pleasently" surprized!

    FastRat
    Mine has a metering plate. But I think I can fit them inline even if it needs a metering block. The t/ram has a carb spaceing measurement of almost 10 3/4 in, so I should be able to fit almost anything up there. I can not side mount carbs on this ram (Offy), it has a divider in the plenum (like a duel plane). I only brought that up because I saw a pic of Marks boat with sideways mounted carbs (Wieland ram) and was surprised the learn he had vac sec carbs.

    Also I was looking at Holley's site and saw a kit that converts both carbs to quick change sec springs and has a vac hose fitting on the covers to connect the carbs together, is that something like what you were talking about above ?

    As far as the Edelbrocks, I was always told they work good (very reliable) if you can get them tuned right but they were a pain to get right (lots of parts need to be changed to make them work on a ram). Was I misinformed about them ? I do like the way they look (shiny ) and I like that not to many people around here run them (dare to be different).

    Thanks again for the replies, I just keep confusing myself with this decision, too many choices. mec450's, vac 600's, dp650's, 660's, vac 750's, Edelbrocks,,,,,,,,,,,,,,

+ Reply to Thread
Page 1 of 3 1 2 3 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in

Tags for this Thread

Digg This Thread

Posting Permissions

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •  
 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95