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Post by XtremeMopar#307 on Aug 11, 2012 20:50:34 GMT -5
Yep that the one... thanks derrick... will a holley 500 bolt up directly to the intake? Or how are these carbs if I just rebuild it?
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catfish
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Post by catfish on Aug 11, 2012 21:59:41 GMT -5
Read up just a couple of posts in this same thread on the proper adapter to run the Holley 4412 500 cfm. I personally don't like the Carter carbs. Get the Holley and adapter or a Rochester 2G. The 2G should bolt right up.
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dm440c
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Post by dm440c on Aug 13, 2012 11:39:09 GMT -5
I have had 1979 360's that came with either the 4 bbl Thermoquad or the 2 bbl Holley, so i guess you could get either but there's no way to confuse a Thermoquad with anything else so it is probably the Holley 2bbl.... unless somebody changed things around somewhere along the way, which you always have to consider with cars this old
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Post by XtremeMopar#307 on Aug 13, 2012 13:38:30 GMT -5
I have one of those 79 360 holley on a 400 of mine, this one is not a holley... sounds like a carter from what catfish described
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Post by mouled26 on Aug 15, 2012 14:23:22 GMT -5
Ok I got the Mr Gasket #1937 and the bolt pattern is way off (to small both ways) on the intake, is there more than 1 adapter or do I need to drill it to fit? This is the first time running a 500 Holley. My initial thought was it had a 318 intake but none of my other carbs fit either. This is going on a 75 Charger running Sat I hope!!! Ed
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dm440c
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Post by dm440c on Aug 16, 2012 11:16:54 GMT -5
Ok I got the Mr Gasket #1937 and the bolt pattern is way off (to small both ways) on the intake, is there more than 1 adapter or do I need to drill it to fit? This is the first time running a 500 Holley. My initial thought was it had a 318 intake but none of my other carbs fit either. This is going on a 75 Charger running Sat I hope!!! Ed yeah look close at it, the slots are there for both patterns but only one is drilled. So I milled out the slots to work for both patterns and then while I was in there I milled the shoulders bigger so I could fit a flat washer under the socket head bolt. Now my adapter works for either a 318 pattern or a 360/383/400 pattern
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Post by mouled26 on Aug 17, 2012 10:02:13 GMT -5
Ok I got the Mr Gasket #1937 and the bolt pattern is way off (to small both ways) on the intake, is there more than 1 adapter or do I need to drill it to fit? This is the first time running a 500 Holley. My initial thought was it had a 318 intake but none of my other carbs fit either. This is going on a 75 Charger running Sat I hope!!! Ed yeah look close at it, the slots are there for both patterns but only one is drilled. So I milled out the slots to work for both patterns and then while I was in there I milled the shoulders bigger so I could fit a flat washer under the socket head bolt. Now my adapter works for either a 318 pattern or a 360/383/400 pattern Thank you I guess now I have 2 I wasn't sure what to do so I stepped up and bought a Trans Dapt 2039 and I like the design better I still had to drill it out a little but only a 16th to get it to fit. I thought I would share that info as well. IT was a tad more but it looks to be better quality but what do I know HAHAHA. Thanks again Ed
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Post by snitily19 on Jul 12, 2013 9:01:05 GMT -5
Hey guys I am helping a couple of kids with there first car 1982 Cordoba with a 318... I am going to let them barrow one of my Rochester carbs and need to know what adapter it will take to do this. It has a 4 barrel on it right now. Any help would be great. I believe I have a couple of Quadrajet to 2g adapters and a holly to 2g. Would either of these work? Thanks
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Post by SDderbyman47 on Jul 12, 2013 9:46:54 GMT -5
Is the 4 barrel on it a thermoquad? If I remember right they have the same bolt pattern as a qudrajet. So if it has a thermo Quad the qudrajet to 2G should work if not I am betting your other one will work posibly
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dm440c
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Post by dm440c on Jul 12, 2013 11:30:12 GMT -5
yes Quadrajet and Thermoquad are the same pattern
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Post by themopar17 on Aug 15, 2013 21:03:30 GMT -5
Do you guys think that a 500 holley 2 barrel would be a good carb to run on a 318 that has a 260/260 cam and a mopar m1 dual plane intake.
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dm440c
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Post by dm440c on Aug 16, 2013 7:19:46 GMT -5
Sure
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Post by lspowered on Sept 17, 2013 21:11:52 GMT -5
hey guys quick question, would I be better off with a 2 barrel or 4 barrel on my 383? it had a thermoquad but it did not run very well. I installed a quadrajet from a small block chevy and it runs a lot better but still can improve a lot I think. right now it will die/stall when shifting into gear if it has not warmed up. it will also miss around 1/2-full throttle but once the peddle has been on the floor for a few seconds it will clean up and scream. if you back off slightly it will start to miss again. it sounds like its missing threw the carb not exhaust.
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dm440c
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Post by dm440c on Sept 18, 2013 14:36:31 GMT -5
there is a thread in the General Build Tips section from a week or so ago dealing with the issue of 2 bbl vs. 4 bbl and if you find it you may find some interesting info. My answer is that it does not matter whether it is a 2 bbl or 4 bbl, it only matters whether it is tuned correctly. A well tuned Quadrajet vs. a well tuned Edelbrock vs. a well tuned Holley Double Pumper vs. a well tuned Holley 4412 vs. a well tuned whatever is a nowhere conversation, but a carb of any description that is not well tuned is worth a lot of discussion.
P.S. this is a very viable discussion when it comes to drag or circle track racing but for demo derby purposes it really doesn't matter what carb you use as long as it is well tuned. I think I repeated that enough. Maybe one more: It just needs to be well tuned.
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Post by mopar400 on Nov 1, 2013 21:05:03 GMT -5
Hi I've got a 400 bb with a factory intake and ThermoQuad. The carb froze up a year or two ago after I had it running. It started right up and idled well and all when I started it a couple years ago. Anyways it sat for a while and now the Throttle butterfly shaft deal is frozen in place. What's my best option? Take it apart and Rebuild carb or put another carb on it? Or put another carb on it? Which carbs fit this intake? I really dont wanna mess with a quadrajet. Will an edelbrock style fit it? It seems to be based off of a thermoquad. It is a derby motor and I don't have to worry about throttle linkage or lockdown cables. The car is just gonna be used to bash thru fields and stuff. Thanks!
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