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So I bought a 1971 Camper Special. someone has installed a 61 T-Bird Spread Bore manifold on it. I spent the weekend rebuilding the holley 4160 Square Bore and it leaks... Leaks bad. so, Time to go back to what I know.
I want to use an Edlebrock again. I'm thinking a 600 CFM should work fine. However the intake is a Spread Bore. should i go that way? the current Holley has just the gasket in place between the Spread Bore manifold and the Square Bore Carb. is this acceptable?
Opinion Time.
Holley or Edelbrock?
Spread Bore to match the OEM Ford T-Bird manifold or go Square Bore?
If I go Square do I need an adapter to the manifold?
1971 Ford F-250 Camper Special.
360 with a 61' T-Bird Spreadbore Manifold. C1AE9425B
Factory PS/PB.
74,000 Original miles.
Third Owner.
You have to check the operation of the throttle plates to make sure they open properly if you are going to try to mix spread and square bore. Also, you need a spacer, of some kind, or the carb will be likely to heat soak and be a problem.
Why is the Holley leaking? Did you get a whole kit or try to reuse some gaskets? Did you replace the o-rings in the transfer tube?
Also, C1AE9425B is not a spread bore unless someone modified it: C1AE-9425-B
I'll pop off the carb when I get home tonight and take a few pictures. It's clearly tapered at the secondaries and larger than the square bore gasket.
Im not sure what I've done wrong with the rebuild. I've never dealt with Holley's. I've got a major leak out of the front tube on top of the carb. Yes I did get a full kit but I'm not sure if I missed something or if there's a clog. The Holly is date coded as a 0, so 1970, 80, 90. It's pretty old looking and I don't want to spend more time fixing it. I would rather replace and just dial it in.
Holley's carb our fairly easy to rebuild. But putting it back together is where it can be a problem is you don't know all the little tricks of reassembling them. Some gaskets look the same but are different etc.
A spread bore carbs can't be used on a square bore intake manifold with out a adaptor plate cause the carbs rear butterfly's blades will hit the intakes base and could damage the card.
Edelbrock. Probably not quite as tunable but also less hassles than a Holley, IMO. Get at least a 1" spacer, you'll need it for linkage to clear since that intake originally used one with coolant circulation.
Not a race motor so go with simple. The Eddy's are much more user friendly. I have a soft spot for older Holley's, even the crappy ones. What are you going to do with your Holley?
I did decide to go edelbrock. Just picked up a 1406 and a fuel regulator. I have no idea what to do with the Holley. It's yours if you want to pay for the shipping. It's got issues and maybe you can fix it better than I.
You should get an owners manuel in the box. It has some fine tuning instructions. Read them carefully. They are good carbs with minimal adjustment out of the box. But out of the box leaves some power on the table.
Why is a 600CFM Square Bore Holley mounted on a square bore carb pad intake manifold with an spread bore adapter?
Supposed List 8005 Photo-
Inquiring mid(s) want to know...
because the PO was an idiot??
Also, teach is right. Read the instruction manual to that Eddy carb well. Get a tuning kit for it with jets, rods, and springs. Easy to tune, and run great when done properly.
I am just wondering if possibly the throttle blades might have been hitting the carb pad bore(s)? But it would have to had some type of spacer whether the OEM heated spacer or a insulated base gasket at the least.
Maybe you are correct, the installer went about it wrong. Talk about flow interference.
The adapter that is shown is not a good idea for normal driving. It creates a "reversion" and has no smooth transition. Be sure to get a spacer that matches the bore separation for the primaries. A spacer with the secondaries joined together will work good.
The Holley is the most throttle sensitive when they are in good condition.
As said before the Edelbrock is more user friendly and will surely work out for your application.
Agreed. I think I will get a different spacer. I'm guessing this was done in the 80's and they needed a spacer for the linkage. I got it running today but it's in need of help. The edelbrock is reversed from the Holley as far as the throttle connections. I'll have to find a better way to connect the peddle. I've got a few issues so far but it seems strong. Anyone know what's needed to connect the throttle?
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