chevystroker
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Post by chevystroker on Sept 4, 2011 19:58:55 GMT -4
Awesome find. That should get better mileage than a 350 small block doing the same work. A little FYI. Just double checked my chevy book, and the 454`s are externally balanced, so you will need a flywheel from a 454. If you look at the flexplate on it now, you should see a weight welded to it near the ring gear. Was the carb on it a Chevy Quadrajet? if so, it would have been jetted for the 454. A quadrajet carb from a small block engine or a smog era engine may not flow enough fuel for it, but the secondary needles are real easy to change on a quadrajet. Much easier than a Holley jets, actually. Wayne
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Creepy
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Dartmouth
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Post by Creepy on Sept 4, 2011 20:18:54 GMT -4
I have a 1100cfm Thermoquad (lol, sewerpipe secondaries) and a Carter mechanical secondary off a '67 GTX 383, 550cfm. I could put a neddle kit in that, its a nice carb.
the intake is spreadbore, the T-quad is spreadbore, and the Carter is squarebore.
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chevystroker
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Post by chevystroker on Sept 4, 2011 21:20:20 GMT -4
I have a 1100cfm Thermoquad (lol, sewerpipe secondaries) and a Carter mechanical secondary off a '67 GTX 383, 550cfm. I could put a neddle kit in that, its a nice carb. the intake is spreadbore, the T-quad is spreadbore, and the Carter is squarebore. Looks like you have it covered. ;D I think a quadrajet flows in the 600 to 700 cfm neighbourhood. A 550 might be too small for a 454 but you would have lots of bottom end torque. 1100 might be too big for a stock engine, even a 454. But I would have to defer to the engine building experts on those numbers.
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Creepy
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Dartmouth
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Post by Creepy on Sept 4, 2011 21:26:45 GMT -4
The thermoquad massive CFM #'s come from the huge secondaries. It has 'normal' primaries, was used on 400" motors, and up to 440's. (stock)
The smaller Carter might help economy, I'm really out of practice with carbs, needs more reading.
I've got a buddy with a newish aftermarkey Holley that's too big for his 5.0 i could probably get for $100. it was new out of the box and he ran it a bit and it was just too big for his car.
i'm not too worried about a carb being an issue. also, I gotta root around my neighbor's retired work trucks and see if there is a TBI setup there somewhere, another option.
i'll focus on finding a flywheel for now. thx for that info.
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Diffsmasher
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"Life is tough, its even tougher when you are stupid"- John Wayne
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Post by Diffsmasher on Sept 4, 2011 22:46:07 GMT -4
Here is a link to a torque splitter from Advance Adapters. I don't know exactly how the Gear Vendors unit works but this Road Ranger unit bolts to the front of your transmission and uses fully synchronized gears so you can split every shift if you want to and has a 27% overdrive. www.advanceadapters.com/categories/complete-units/91/
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Creepy
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Dartmouth
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Post by Creepy on Sept 5, 2011 11:36:58 GMT -4
Whoa, that is awesome. the other unit's I've been reading about are $3000+!!! This one is pretty affordable, and AA are the best. This unit is a real possibility for this build, thx for the link! You wouldn't have to split every gear either, but it would really help for passing, not having to drop out of 4th to 3rd, its a huge difference. you could just drop out of overdrive by shifting the Ranger to pass. The big block is gonna want to stay down around 2000-2500rpm most of the time, not screaming 3500 to pass.
I think Mack trucks use something similar, they split every gear and have two shifters, Al used to drive a yellow Mack dump the odd time, and its nickname was 'Banana Split' because it was yellow.
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Post by chefted on Sept 5, 2011 20:38:10 GMT -4
look at it this way - its going to be better than 4 trips to one place hauling two trailers. If I get the 454 average of 7mpg towing loaded, I'll be better off. And 1/2 the time behind the wheel. If I get rich, I've been looking at the Gear Vendor overdrives for the SM465, pretty cool, you can split the gears, and its like a 25-30% increase in milage. they cost something like $3K tho. I'm going to research brownie aux. trans, and see if there is a cheaper way to overdrive the 4speed with a big-rig aux. OD unit. i have plenty of drivetrain length to fix extra hardware. air shifter on the trans stick would be cool. Ya ya, I was just razin ya because of the 4.3 chevy thing. lol I get about 8 in my Waggy towing my jeep. The 454 with the performer intake, if they bought the matching camshaft, I think would make about 400FTlbs at 2500 so should tow well.
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willyswagon
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King of the last minute Road Trip
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Post by willyswagon on Sept 5, 2011 20:48:00 GMT -4
You'll love it Jan. My old neighbour in NS put one in every motorhome he bought. He said it made the gas ones a pleasure to drive. He would find a used motorhome that someone was trading because it was under powered (ie they wanted a diesel), slap the new unit in and Ta Da ! It would pull like a freight train He'd sell it the next year and move on to another one. Made $$$ on every one of them.
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90bronco
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just smitin'
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Post by 90bronco on Sept 6, 2011 21:00:22 GMT -4
The thermoquad massive CFM #'s come from the huge secondaries. It has 'normal' primaries, was used on 400" motors, and up to 440's. (stock) The smaller Carter might help economy, I'm really out of practice with carbs, needs more reading. I've got a buddy with a newish aftermarkey Holley that's too big for his 5.0 i could probably get for $100. it was new out of the box and he ran it a bit and it was just too big for his car. i'm not too worried about a carb being an issue. also, I gotta root around my neighbor's retired work trucks and see if there is a TBI setup there somewhere, another option. i'll focus on finding a flywheel for now. thx for that info. I'd go with carter or thermobog , never had much luck with holly's like double pumper's on stock motor's .....finiky to get set right i found for my backyard experience.
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Hawkes
Hardcore
Lurker
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Post by Hawkes on Sept 6, 2011 21:46:07 GMT -4
All GM small blocks changed flywheel bolt pattern in 1986, not sure if the big block did. Chevystroker probably knows.
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chevystroker
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Post by chevystroker on Sept 6, 2011 22:01:16 GMT -4
All GM small blocks changed flywheel bolt pattern in 1986, not sure if the big block did. Chevystroker probably knows. LOL The 1985 and down small block engines had a two piece crank seal, and the end of the crank had an irregular shape which was actually part of the engine balancing. When they went to a once piece seal in 1986, the end of the crank was now round, which got rid of the balancing, and required a weight to be added to the flexplate or flywheel. The only change to the bolt pattern was the addition of a locating dowel pin on the end of the crank so the flywheel can only go on one way. I don't know about the big blocks, but I assume they changed to a one piece seal somewhere around there as well. But, I think Jan said his engine was a 1976 model, so it would be old enough to be 2 piece seal anyway. And that is all I know. ;D
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Creepy
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Dartmouth
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Post by Creepy on Sept 7, 2011 5:43:40 GMT -4
C'mon Wayne, enough with the blibber-blabber! Who much weight do i weld to a 350 flywheel? joking.......maybe?
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chevystroker
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Post by chevystroker on Sept 7, 2011 7:14:48 GMT -4
R&D performance in Truro sells a weight to bolt onto a flexplate to turn a non weighted one into a weighted one for a 400 smallblock. So, I am sure there are weights one could buy for a big block as well. These weights bolt between a flex plate and the crank for automatics. Not sure if that would be a good idea for a flywheel though, and you would need longer bolts. A search in Sumit Racing for 'counterweight' will give you a start. There are bolt on weights for balancers, so should be some for flywheels. www.summitracing.com/search/?keyword=counterweight&dds=1Advanced clutch technologies, ATI, Ram automotive, Hays and Tilton engineering all might have something. (I think Tilton was the brand of counterweight that R&D had.) I can't do ALL the work for ya. ;D
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chevystroker
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Post by chevystroker on Sept 7, 2011 7:30:24 GMT -4
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bill richards
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Post by bill richards on Sept 7, 2011 11:03:13 GMT -4
pic from another site... Bill
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