So I bought a tunnel ram last season with a motor that I later found out was trash.. Im trying to figure out if I can use the t/r with my new setup but dont know the CFMs on the Holleys and cant seem to find a site with numbers. He said they were 2 850s but that seems pretty excessive for a 468 that was pretty mellow. Not to mention the guy was one hell of a liar I later found out.  Problem is... the list number was cut off. Is there any other way to tell what they are? I heard by measureing the base plate but I cant find what measurements mean what carb.. Thanks!

Im hoping their alot smaller than 850s so I can bolt em up to a stock bore 454 or 396. If not Ill just have to buy new ones and keep these around for a big motor build next winter.

Does just under 1 3/4 sound right? I get like 1 and 11/16s with my tape. Number on the top of the venturis is 6R 3745 B if that means anything.

Yah, Thats both primary and secondary. Thanks alot for checkin that out for me.. Really appreciate it!

i just bought a boat from texas and it has a 468 in it and two 750 holleys on a weined tunnel ram

I ran twin 4160 750's on my .030 460 for 2 years with no problems at all. Cammed and high compression though. Ran out great, fuel economy was pretty good really, until you flatfooted the thing extensively. Then.....well......it got a little expensive to run. Even after I blew it up though, plugs were a VERY consistent caramel color.

Nordie and I were talking the other day about one run. Both tanks full, (28 gallons total) from a trip upriver from Pirates Cove to the AVI, Lost Nordie and the rest pretty quick, but held it pretty constant from 4500-6000 the whole way up, Throwing roost on occasion to the beach combers. What is that? 10 miles or less? Anyways, ran one tank out and had 1/2 left in the other............

Ray

Im not all that concerned about fuel usage as much as tunning. I just hear horror storys about T/Rs but Im pretty much set on the looks of running one. Im hoping to be able to use this setup instead of re-buying carbs. These carbs also need rebuilt.. Might be a pain to order a rebuild kit without the CFM.. 

Take the carbs to the shop. They can figure it out, I'm sure. I think Fuel Curve West is near you. They can even probably 99% dial the carbs if you have all the stats on your engine. Still gonna be cheaper than buying new or buying used then rebuilding those...........T/R's can and will run great! Many of us run them, and once dialed, really as problem free as any single carb setup.

I was not gonna open up my preference for vac sec'y carbs in this instance, but truly, unless its a full out race application, you are far better off that way.  Post some pics of the carbs up. 

Ray