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#1
06-15-2002, 01:39 AM
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Square or spread bore?
is the Thermo-Quad a spread-bore or a square-bore? I am wanting to buy and install an Edelbrock 750 cfm w/ electric choke and a stock 440, and was wondering if it would bolt right on? what does everyone think of this setup? I was also thinking about the Performer manifold...
Steve 
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#2
06-15-2002, 02:54 AM
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The Thermoquad is a Spread bore, while the standard Carter and Edelbrock AFB's, as well as most Holleys, are square or 4 hole flanged. Whether either carb will bolt up, will depend on what intake manifold you have. The Thermoquads work good, but are difficult to adjust, while the Edelbrock/Carter and Holley's are much easier to tune. I'll say it's pretty likely most Performer manifolds will have the square bore flange. so should work fine with an Edelbrock 750.
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#3
06-15-2002, 03:31 AM
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there are adapters that you can use to go from spread bore to square, and visa-versa....you can get them at any local parts store (auto zone is where my brother got his) they are usually pretty cheap... thats the easiest way to go, you don't have to worry about matching the carb to the manifold, the adapter can also work as a spacer at the same time... in some cases that could be a problem...or a good reason to cut a hole or get a hood scoop
 just depends on how you look at it 
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#4
06-15-2002, 08:51 AM
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From the bin there camp.... Not on a Big block thou, I cant see a diff in the bore size pattern on the intake. Booth secondarys are the same @ 2.1/2" in size. I bolted on a 625 Carter to a stock cast iron intake. NO ADAPTER needed !
The Adapter spoken about will raise carb height abit. Do you have clearance for an 1/2 inch or more. Also, a side effect of the adapter is a decrease in cfm. It is a restriction to the T-Q. I find the T-Q not bad to adjust. Tune...well, thats different. They don't make parts for this anymore. In order to get a different rod or jet, it's ethier get/buy from a freind or go to a swap meet. Ask around if theres a problem with the squrebore to Edel. Performer. Ask tose who have done it.
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#5
06-15-2002, 09:01 AM
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oooppssssss
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#6
06-15-2002, 09:36 AM
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opps too.
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#7
06-15-2002, 10:51 AM
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Double posted ...could not deleate...I don't know why.
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#8
06-15-2002, 10:55 AM
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?? oops (or opps as jim sais
) what??isn't there a difference in size of the actual opening in an intake for a spreadbore? (much bigger hole...holly carb like mine won't fit...) and visa-versa. when i first got my NOS in, the carb plate was WAY too big, for a spread-bore....wouldn't even match the holes on the intake.... or is this only on a small block, and all same size on big block? i'm confused...and tired (i actaully got my dead butt out of bed at 9:30 AM! its been a while since i've done that... )
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#9
06-15-2002, 11:11 AM
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Would an edelbrock carb bolt up to the stock intake on my 440? Also, what do you guys think about manual choke..?? Any better/worse?
Thanks a million guys! Steve
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#10
06-15-2002, 11:14 AM
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I'm surprised to see this question from you. I told you to go wake up first! Then go into your PAW catolog and take a peak at intakes. Then go to carbs. Shame on you stayin out so late! (LOL)
Holleys have a different bolt hole width that the bolts them down. It probly didn't match the intake you have tried it on. Some Holleys have the spreadbore pattern. (Becuase there spreadbores.)
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#11
06-15-2002, 11:56 AM
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ditchpickle: i like manual chokes better than electric because i know when its on, and i can control how much it chokes... i don't, havne't, and probably won't ever trust an electric on my motor.
rumblefish: sorry....forgot....i was tired... i even ran over the cord for our swimming pool pump....slit in 2....fixed it but a connector came off the switch INSIDE the pump....  i knew holleys have spreadbore....my dad has an 850DP that is a spreadbore....it was on his race car. my torker II isn't a spreadbore intake, i like it...thats why the first NOS plate i had didn't fit....an adapter wouldn't have even fixed it, it was real far off... i would go to sleep earlier, but i haven't found a way to say "no" to my girlfriend w/out pissing her off....when she wants sumthin, theres no stopping her thanx god she hates drugs, smoking, low-riders, fords, and ricers!
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#12
06-16-2002, 04:17 AM
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Quote:
 (850 spreadbore?This I gotta see.) 
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#13
06-16-2002, 04:23 AM
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oof, i goofed on the cfm...sorry...he doesn't remember how many cfms, but its a holley spreadbore...(holley is all over it, and its def. a spreadbore...)
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#14
06-17-2002, 12:56 AM
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So.... I need to know if this Edelbrock carb will bolt up to my stock intake?????
Thanks Steve
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#15
06-17-2002, 01:10 AM
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Ditch pickle.
The Edelbrock is a square bore carb. What enigine are you running? The Edelbrock Performer Manifold for big blocks is a dual pattern manifold meaning it will take either a spread bore or a square bore carb. Don't know about small blocks. Spread bores can be identified by looking at the secondaries, they are much larger than the primaries. IF you have a big block and your getting the Edelbrock Performer manifold (NOT the RPM manifold because it's square bore only!!!) then any carb you want will bolt up to it.
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#16
06-17-2002, 01:14 AM
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The engine is a stock '77 440. Stock Intake. Need to know if it will bolt up
Thanks a million! Steve
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#17
06-17-2002, 01:23 AM
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A stock 77 intake is more than likely a spread bore manifold so a square bore carb will need to be used with a square bore to spread bore adaptor. They are about 3/4" high so make sure it clears your hood. You can get the adaptors for like 15 bucks at any Advance or Parts house in there performance upgrade section normally.
Personally I like my electric choke and it seems to work fine to me. They are easy to adjust by just unscrewing the bolts around the case and twisting the case. Often people wire it incorrectly by wiring it into the ignition system. This doesn't work well because it robs power from the ignition system and it and the ignition is not operating at the necessary 12 volts.
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#18
06-17-2002, 01:28 AM
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Ok.. I remeber seeing those adapter plates at Checker, but it was an"open" one, where it was basically a big open square inside the bolt pattern. the edelbrock book says NOT to use an open adaprter....So, Do i have to find a 4 hole adapter, and does it have to be an edelbrock adapter or what??
Thanks a lot 71383BEE!!!! Steve
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#19
06-17-2002, 01:46 AM
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As far as I know they don't make a 4 hole spread bore adaptor. the reason it is so big is that the difference between a spreadbores secondaries and a square bores secondaries is considerable. The adaptor will work and your car will run, but it may need a bit more fine tuning and it wonk run as well as it could. The open spacer actually defeats some of the benefits of a dual plane intake which are idle quality, driveabiltity, and low end grunt.
You mentioned switching intakes before. This would probably yeild better results for your 440 if your swapped intakes and carbs versus just swapping the carb. In fact I would even say that an intake swap with the stock carb would yield better results than just a carb swap on the stock intake. Any aftermarket dual plane manifold is light years better than your stock smog 440 manifold and it will help the engine breathe better.
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#20
06-17-2002, 04:00 AM
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A shot of the spacer on a RPM w/ T-Q on top.
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#21
06-17-2002, 04:03 AM
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And a side shot from the fender showing height
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#22
06-17-2002, 04:03 AM
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this rumblefish360's pic:
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#23
06-17-2002, 04:12 AM
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Thank you there buddy
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#24
06-17-2002, 04:18 AM
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the credit goes to rumblefish360 for these pictures...i'm just posting for him because i confused the hell out of him trying to explain....
this picture is taken level w/the fenderwell, showing how tall the studs etc of his carb is  this one shows the same thing, but from the front  this is the same, from the side but w/the air cleaner on - he told me his hood won't shut because of the adapter. (if i'm wrong, correct me pls) 
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#25
06-17-2002, 04:21 AM
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Thank you there buddy for posting.
The carter should bolt on without an adapter. Theres the pic's of the adapter with the T-Q on top And the side shot showing the top of the T-Q over the fender. The fender of the Cuda is highest at the edge. It dips down a bit going towards the center. It really adds height.
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#26
06-17-2002, 04:26 AM
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OK....were almost working together.
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#27
06-17-2002, 04:29 AM
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thought i'd save ya a migraine and do it myself....
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