spreadbore carb
#1
Racer
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Location: Philadelphia Pennsylvania
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spreadbore carb
So I ordered a new holley carb because my 4165-6210 was leaking gas, not idling properly, and would stall on braking. Unfortunately I didn't think to check bore type and got a square bore 4150 instead of the spread bore that my stock l-48 intake requires. From what I've read on these 6210s the flood-on-braking problem is extremely common even when floats are properly adjusted. So, I'm considering my options:
in order of preference
I have a '75 4spd, small block l-48 with 1 5/8 headers, true dual 2 1/2", magnaflows, stock hood, stock dual snorkel housing, stock internals. I plan on getting a zz4 crate soon, so I am hoping that if I buy a new carb I can re-use it on the zz4. The zz4 crate seems to support spreadbore or squarebore equally with no adaptors.
Is an adapter appropriate here? I read briefly that with a small block it should fit under the stock hood with little to no perf loss. On the zz4 I could toss the adapter.
I'm hesitant to get another 6210 because as far as I know the stall-on-braking problems would still be there.
I'm okay with the idea of Edelbrock branded Qjets though I don't know much about them, heard they may run lean.
I have the Holley techbook so I guess I could rebuild the 6210 but I'm afraid it'll take me forever and I want to get back on the road.
Having somebody else rebuild the carb seems expensive and time consuming enough that I'd rather spend a extra for a new carb than go this route. Again, trying to get back on the road.
Any advice?
in order of preference
- spreadbore to squarebore adapter
- return the 4150 and get another 4165-6210
- return the 4150 and get an Edelbrock qjet
- rebuild the 6210
- pay somebody else to rebuild the 6210
I have a '75 4spd, small block l-48 with 1 5/8 headers, true dual 2 1/2", magnaflows, stock hood, stock dual snorkel housing, stock internals. I plan on getting a zz4 crate soon, so I am hoping that if I buy a new carb I can re-use it on the zz4. The zz4 crate seems to support spreadbore or squarebore equally with no adaptors.
Is an adapter appropriate here? I read briefly that with a small block it should fit under the stock hood with little to no perf loss. On the zz4 I could toss the adapter.
I'm hesitant to get another 6210 because as far as I know the stall-on-braking problems would still be there.
I'm okay with the idea of Edelbrock branded Qjets though I don't know much about them, heard they may run lean.
I have the Holley techbook so I guess I could rebuild the 6210 but I'm afraid it'll take me forever and I want to get back on the road.
Having somebody else rebuild the carb seems expensive and time consuming enough that I'd rather spend a extra for a new carb than go this route. Again, trying to get back on the road.
Any advice?
Last edited by brianPA; 08-11-2012 at 04:56 PM.
#3
Safety Car
The Edelbrock 2101 intake can be used with a spread-bore or square-bore carb. The other Holley option is the 4175 spread-bore carb. I bought mine from Summit and it has worked well. I did have to deal with a couple of issues because of the cowl induction hood and stock air cleaner though.
#4
Racer
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Member Since: Dec 2011
Location: Philadelphia Pennsylvania
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I considered the new air intake route but I have no idea how hard it would be to swap. Getting the carb off was really easy. Again, it would have to be something appropriate for a zz4 also. The zz4 long block comes with an intake but I have no idea how good it is. If it would make sense to get an intake that I can put on my l48 and then move to the zz4 later I am game. Edelbrock RPM Performer with drop base cleaner maybe? Gotta fit under the stock hood.
#6
Le Mans Master
edelbrock no longer makes quadrajets. they still make parts. the holley spread bore is a good choice . a good rebuilt quadrajet done by someone who knows what he is doing is a good option too
Last edited by 7t9l82; 08-11-2012 at 10:51 PM. Reason: stupid spell check