Fuel efficiency isnt really a concern since it has a plow hanging off the front of it anyway. carb and intake for it.Īnd yes, cold starting is a lot nicer with throttle body, but with what we have and what we wanna spend in time and money it seems to be alot more effective to put a carb on it. Tuning this thing is out the window, we have, hei dist. And we did throw a set of long tube headers on it. Upload Video now COMP Big Mutha’ Thumpr, LS1 COMP Big Mutha Thumpr (54-602-11) LS1 0:00 / 5:12 Camshaft Brand Vehicle Make Chevy / GM Engine LS (All ) Camshaft Name/Description (Product Line, Grind Details, etc). stall is supposed to be around 2500 but it seemed to be a little higher than that. To hear what your vehicle could sound like with an aftermarket cam installed, use the Search By Engine process below. We put a new converter in that was made for a grand national. adjusting idle screw, unplugging iac, trying to relearn iac all came with no luck of course. It did idle for a while at 450 rpm (on the timing light)then it all went down hill from there. We gave it 8* of base timing when we tried running with the tb. The new motor is out of a 92 with 65k miles on it. Yes it is a very big cam for what we are doing, my buddy ordered it after having a few drinks but since we have it now we just put it in anyway. I don't know of any body burning chips that would wanna take a stab at that radical of a cam without a wide band and some datalogging software. To the OP in your case if you have a carb and the right intake, and an HEI distributor then go ahead and put the carb on. I don't have the specs on hand but nothing like that thumper. Believe it or not I get 22 on the highway with it, AC on high. Performance wise I might have a little left on the table on the high end, but drivability couldn't be better. It was almost 10 below and that thing started right up without a hitch. It took time and some money to make it work, but I would never go back to a carb at this point. I have a TBI throttle body bored out to twin 52MM, Holley pro jection 2 barrell intake manifold, BBC chevy injectors, custom AFPR, Walbro 255 Pump, and a custom chip burned from Brian at TBI. I have a mild (330HP ish estimated) V8 S10 that originally came with TBI so i kept it. There are so many good computer-friendly grinds out there, it doesn't make any sense to try to work around that cam. Even a skilled programmer might not be able to get TBI to run properly with that cam - but whatever compromise you'd have to make with TBI would only be worse if you put a carb on it. It doesn't have anything to do with performance. The Thumper series is all about the sound - that "old school muscle car sound", whatever that is. I have to say, though, that you made a poor choice for a cam. I would not say carb is better in the long run - it may be argued that it is better in the short run (no particular skill required to get it to run with carb). ![]() A properly programmed TBI is superior to carb in all ways. If I was you Id get magnum heads, thinnest heads gaskets, eddy rpm intake put smallest thumper cam and headers, dont even touch the bottom end youll have 350 hp and at least 9:1 compression. ![]() I'll have to respectfully disagree with you, 95Z. This motor was assembled with the help of my studious 12 year old.TBI is a "speed density" system, meaning no mass air flow sensor, and meaning programing assumptions are made about the operating conditions such that if you change any of them (like exhaust flow, engine displacement, cam duration, etc.), you need to reprogram the assumptions in the computer. Using a TH400 with gear vendors unit and an Edge 3000 rpm stall convertor. Last weekend I laid down 75 foot posi marks and had to lift because I was in our neighborhood street! Closest track is 120 miles away, but seat of the pants feel is a 12 second car. Goal was to have a 12 second STREET car on a budjet that SOUNDS like an old school ride from the 1970s.I had a 13.3 second at 107 mph 67 Firebird with a built 440 (428 + 0.060) and this little 454 kicks it's butt. This combo was suggested by Mike Lewis (Wolfplace here) and let me tell you-it's a REALLY nice setup. The reason for posting is so all could see/hear what a 454 with standard bore and cast pistons (junkyard find- no machine work) and pocket ported 781s and Comp Cams Hydralic Mother Thumper Cam and Sean Murphy Quadrajet Performer RPM intake Dougs 1-3/4 inch primary headers and 2-1/2 inch Flowmasters sounds like. ![]() I am a once Pontiac, now Chevy guy!! I started other postings on this set up over the past year-check out my statistics. This is the culmination of a year of weekends working on my 66 Chevellle project.
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