Thread: Square bore vs Spread bore?
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08-14-2006 01:37 AM #1
Square bore vs Spread bore?
Can anyone tell me exactly what the difference is between a Spread bore and a Square bore carburator?
Thanks...MikeOlChvyRacr
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08-14-2006 01:39 AM #2
Square bores have the same size throttle plates for primaries and secondaries. Spread bores have bigger throttle plates for the secondaries.If I knew anything I'd be dangerous.
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08-14-2006 02:48 AM #3
Originally Posted by Gerald Streeks"aerodynamics are for people who cant build engines"
Enzo Ferrari
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08-14-2006 03:21 AM #4
Weren't spread bores made to replace quadrajets with the bigger secondaries?
Don
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08-14-2006 03:23 AM #5
Spreadbores are just Edelbrock and Holley version of Q-jet.If I knew anything I'd be dangerous.
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08-14-2006 03:25 AM #6
I think they have a cooler sound when you hit the gas. When those big secondaries open it sounds like a big vacuum cleaner...whoooosh.If I knew anything I'd be dangerous.
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08-14-2006 10:58 AM #7
Originally Posted by southerner
Looking at the picture of the bottom of the throttle plate, the bolt pattern isn't square.
Mike M.OlChvyRacr
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08-14-2006 11:12 AM #8
Is it a performer rpm air-gap intake? b/c I believe they are made for square bore.
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08-14-2006 11:17 AM #9
No, it's an Edelbrock Air gap but the bolt pattern is the same as my old Performer RPM.OlChvyRacr
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08-14-2006 11:19 AM #10
If the bottom of the carb looks like this it should fit. I have the 4777 on a Performer RPM, which i believe is just the 650 opposed to the 750 you are looking at.Last edited by HellCaminoKid; 08-14-2006 at 11:26 AM.
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08-14-2006 11:52 AM #11
it will fit the air gap is made to accept square and spreadbore carbs... so no worriesjust because your car is faster, doesn't mean i cant outdrive you... give me a curvy mountain road and i'll beat you any day
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08-14-2006 01:41 PM #12
Thanks guys for your replys and the nice picture. Looks like it should fit.
Camino, Yeah I have a 4777-7 (650 CFM) on an Edelbrock RPM on the Nomad now.
Doing an upgrade on the 355 cu:
New Trick Flow 195 aluminum Heads
Edelbrock Air gap manifold (Durashine)
Hydrolic roller cam (not purchased yet) looking at the Comp 276HR
Larger 750 carb (subject of this post)
RPM stainless Roller rockers
This is mostly a show car (56 nomad) but being an old racer from the 60's,
this thing has got to run pretty strong.OlChvyRacr
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08-14-2006 01:47 PM #13
No problem, would that 4777-7 be up for sale??? I'm having some issues with mine at the moment, its a good 10 years old, probably just in need of a good rebuild.
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08-14-2006 03:31 PM #14
Originally Posted by HellCaminoKid
I have to win the one on EBay first.
I've added the choke to it and it has an 8.5 Power valve in it right now. Jets are .069 and .072OlChvyRacr
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