460 with thermoquad
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Joined: Sep 2007
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From: Mcafee, NJ
460 with thermoquad
My new to me 1975 f100 came with a 460 swapped from a 74 Mercury Marquis. This was also the only year Ford used the loved and hated Thermoquad carb.
I like the idea of keeping the odd ball carb but currently its sitting on an Edelbrock Performer intake and squarebore (intake) to spreadbore (carb) adapter.
Id like to mount the Thermoquad to an actual spreadbore intake, but the only one available is an Edelbrock Air Gap or RPM Performer which both have an rpm range of 1500-6500 where as the Performer has a idle to 5500 rpm range.
I guess what im asking is how will the engine run act being stock other than that intake?
is it worth going to the right intake without the adapter?
I like the idea of keeping the odd ball carb but currently its sitting on an Edelbrock Performer intake and squarebore (intake) to spreadbore (carb) adapter.
Id like to mount the Thermoquad to an actual spreadbore intake, but the only one available is an Edelbrock Air Gap or RPM Performer which both have an rpm range of 1500-6500 where as the Performer has a idle to 5500 rpm range.
I guess what im asking is how will the engine run act being stock other than that intake?
is it worth going to the right intake without the adapter?
Logistics Pro
Joined: Jul 2005
Posts: 4,217
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An aftermarket intake manifold is usually a good improvement which you can feel, on an otherwise stock engine - as long as you stick to the original format, i.e. single vs. dual plane, and probably open vs. spread bores.
So you're saying that the Performer has an completely open intake, with no divider between the primaries and secondaries? If it's dual plane, I think it should still be good for street use. But the spread bore manifold and matching spacer might just be an improvement over that. Though I've read that big blocks are more forgiving of something like a single plane open bore manifold in street use.
Can you post up pics of the bottom of the carb, the spacer, and intake manifold opening?
So you're saying that the Performer has an completely open intake, with no divider between the primaries and secondaries? If it's dual plane, I think it should still be good for street use. But the spread bore manifold and matching spacer might just be an improvement over that. Though I've read that big blocks are more forgiving of something like a single plane open bore manifold in street use.
Can you post up pics of the bottom of the carb, the spacer, and intake manifold opening?
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