Re: Thermoquad vs Quadrajet
Larry,
Thanks for the plug. Your new car looks great!
John,
I'v never heard of anyone comparing the Q-Jet with a Thermoquad so here's my opinion. Since both are rated at 800 cfm and if you had both properly jetted, it should be a wash. The engine doesn't know type just flow. You would have to compare a known good Q-Jet with a known good Thermoquad to know for sure. I assume that in the Thermoquad world as in the Q-Jet's, there is sometimes a big difference between cores. You could do up 5 of the same number and one would probably be faster. Dynos won't tell you either. The real test is the time slip. Period. If you choose to go with an Edelbrock, there are 4 numbers you can use; #1903, 1904, 1910, and 1905. The 1910 claimes to be an 850 but the primaries measure 1.218 which is what a 800 is. The 1905 is a direct replacement fot the Thermoquad on 1985 and earlier engines so it will have the correct linkage for Mopar engines. The Edelbrock are no longer manufactured and only occasionally will you find a new one from a parts supplier. E-Bay is a good source for used ones and sometimes there are new ones on there also. 800 cfm Quadrajets were used on a wide variety of GM engines from 301 to 455 in Buick, Olds, Pontiac, Cadilliac, and Chevy so if you know what to look for they can be found on E-Bay also. I stock new and used 800's. Don't be afraid to have someone outside California blueprint a Q-Jet for you as ther are a lot of good builders out there. Some of my Calif. customers include Grossi, DeFrank, Glassbrenner, Tim Smith, Bob Aceves, Bob Mulrey,and Ed Drucker . I'm not suppose to advertise on here so if you need my number maybe someone will post it or you can PM me. Danny
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