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  #16 (permalink)  
Old 12-23-2011, 12:31 PM
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So when did you stick the 700R4 in it?

With that trans you can run a lot more rear gear if you wanted to. A 3.36 is effectively a 2.35 final ratio in OD. Too high of a gear won't necessarily help mileage, at some point you reach a point where the engine is too far down in the powerband to be efficient and you may find a lot of 'hunting' in and out of OD w/any throttle movement or load from road grade, etc. The only real saving grace is the power to weight you're dealing with.
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  #17 (permalink)  
Old 12-23-2011, 12:44 PM
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Quote:
Originally Posted by cobalt327
So when did you stick the 700R4 in it?

With that trans you can run a lot more rear gear if you wanted to. A 3.36 is effectively a 2.35 final ratio in OD. Too high of a gear won't necessarily help mileage, at some point you reach a point where the engine is too far down in the powerband to be efficient and you may find a lot of 'hunting' in and out of OD w/any throttle movement or load from road grade, etc. The only real saving grace is the power to weight you're dealing with.
I installed the 700R4 the same time as the 305. They were bought together as a unit. With the power to weight ratio that I am running, it stays in OD really well above 45. It will drop into OD @ 40 if I let up on the gas momentarily, and will stay in OD until I get to the next traffic stoplight. I have put over 2,000 miles on since installing the 700R4 and am really pleased with how it operates. Haven't had any problems at all with 'hunting' in and out of OD. Probably wouldn't do as well in a heavier vehicle with the same axle ratio. BTW. I can see the carb while I am driving and the throttle is barely off idle @ 40, and not that much more @ 50.
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  #18 (permalink)  
Old 12-23-2011, 03:25 PM
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Sounds like you hit the sweet spot all the way 'round. Too bad, too- nothing else to do now... yeah, right!
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Old 12-23-2011, 06:17 PM
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The 305 can have a nice pull. The 3.5" stroke is a good idea for thrust , Unlike the 3 " of the poochy 302. The 3.75 bore cuts will like a 1.94" valve, that is important. Power is directly related to intake valve diameter. Chamber should be milled to 58-62 cc for that displacement, vortecs are top of the line factory equip that last lifetimes. Summit/Jeggs value aluminum 2.02/1.60 175cc type 62cc pair can be nice, once dedicated to the power route.

My 305 has the performer package, QJet with perfrm vortec intake, 906 vortec heads , with 1.94 1.50 valves , milled to 62 cc for compression. Some gmmp beehive springs, with 3.73 gears and 28" tires the th350c locked up , hums along the the slow lane 65mph at 2850 rpm. Gets 16 mpg , and cruise control on it feels like a boat. It is enjoyably driveable over long distance, and makes 30+ psi oil prerssure at 65.

Last edited by spinn; 12-23-2011 at 06:46 PM.
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  #20 (permalink)  
Old 12-23-2011, 09:26 PM
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I have a nice running 305 in my silverado. edelbrocks perfromer cam. Nice sound to me but I would like a lttle more lope for car show appearances without loosing my torque. I love torque
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  #21 (permalink)  
Old 12-24-2011, 02:31 AM
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Got lope?

Retard the ignition and pull a plug wire! JK
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  #22 (permalink)  
Old 12-24-2011, 09:42 AM
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i also noticed you're running BOP quadrajet; No big deal---just curious as to why?

Also, tell me more about the steel braided fuel line?
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  #23 (permalink)  
Old 12-24-2011, 11:21 AM
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Quote:
Originally Posted by against all odds
i also noticed you're running BOP quadrajet; No big deal---just curious as to why?

Also, tell me more about the steel braided fuel line?

The q-jet was bought from an ebay seller and rebuilt by me. I had checked the numbers with Cobalt327 and he said it would be a good carb to rebuild. After rebuilding it and a jet change, I couldn't be happier with how it performs at all speeds and throttle positions. The fuel line is just a braided stainless sheath over neoprene fuel hose. It was on the rod when I bought it so not sure of the source. It looks great though, and I like the abrasion resistance.
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