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Topic Review (Newest First)
12-24-2011 11:21 AM
adantessr
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.
12-24-2011 09:42 AM
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?
12-24-2011 02:31 AM
cobalt327
Got lope?

Retard the ignition and pull a plug wire! JK
12-23-2011 09:26 PM
American Muscle 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
12-23-2011 06:17 PM
spinn 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.
12-23-2011 03:25 PM
cobalt327 Sounds like you hit the sweet spot all the way 'round. Too bad, too- nothing else to do now... yeah, right!
12-23-2011 12:44 PM
adantessr
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.
12-23-2011 12:31 PM
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.
12-23-2011 12:02 PM
adantessr
Quote:
Originally Posted by cobalt327
Last I knew you had a TH350C. Oh well.

From my notes- I don't know who to credit it to: "55-56 had 3.70 with a standard trans, 4.11 with the OD trans, and 3.55 with the auto trans. In 57 they went to 14 inch tires and then they used a 3.55 with a standard trans and 3.36 with the auto trans."
When I did the walk alongside while watching the driveline, I know it was less than 3 and 1/2 turns, I actually thought that it was real close to 3 and 1/4, so it most likely is the 3.36:1 ratio. Thanks, Big Al
12-23-2011 11:49 AM
cobalt327 Last I knew you had a TH350C. Oh well.

From my notes- I don't know who to credit it to: "55-56 had 3.70 with a standard trans, 4.11 with the OD trans, and 3.55 with the auto trans. In 57 they went to 14 inch tires and then they used a 3.55 with a standard trans and 3.36 with the auto trans."
12-23-2011 11:17 AM
adantessr
Quote:
Originally Posted by cobalt327
I thought you had a corporate 10-bolt rearend (don't ask me why I thought that), the 2.41 was a fairly common ratio for them.

But I cannot remember a '58-'64 application that would have had a 2.41 ratio. That ratio wasn't used during '55-'57, 3.36 was as high as they got IIRC. I know it prolly doesn't matter that much one way or the other but I wonder if there was a 2.41 used from the factory during the "Hotchkiss" era.
Back and forth here, so you say that 3.36 was a pretty common ratio for '57 ? Just like to know what to say, other than I don't know, when people ask. According to what whyholdback has calculated, that would be really close with the .70 overdrive and 26' tall tires. Thanks, Big Al
12-23-2011 11:10 AM
adantessr
Quote:
Originally Posted by whyholdback
You guys are forgetting about the OD. I didn't bother figuring out the actual gear because the OP indicated a definite lack of interest.
Figuring 2.41 is close, because a 3.42:1 axle with the 700R-4s 0.70:1 OD gives 2.38:1
In which case, the correct speedometer gears are a 17-tooth drive gear, and a 44 tooth driven gear.
Thanks, whyholdback for your interest. Yeah it looks like cobalt327 forgot about the 700R4 with the .70 overdrive. I actually read his post as 3.41. . My bad . Yeah. it would be nice to know the actual ratio, because I am always asked that along with the other usual questions. IE: eng., trans., cam,. So considering that the tire height is 26" (just measured) and the engine runs about 2100 rpm @ 70 mph., what do you suppose my rear axle ratio is ? 3.42:1 ? BTW, I am running a 39 tooth driven gear against a 15 tooth drive gear (if I remember correctly) and the speedo still runs slow. Not really wanting to change speedo drive gears, as they are not cheap. But as I mentioned, the speedo is electronic and programmable, but is close enough for me. I know how much it is off, so I drive accordingly. I did program the speedo when I had the TH350, and if I remember right, you can't get it exact anyway. Did you know that as tires wear, distances from point A to point B increase ? I used to have to keep records of my mileage for tax purposes at my last job. I used to set my trip meter in my driveway and reset at the mine entrance. As tires wore down, the trip distance would change from 32.6 min with new tires to 33.1 with worn.
12-23-2011 10:42 AM
cobalt327
Quote:
Originally Posted by adantessr
Thanks Mark. That sounds just about exactly what I am running for rpm @ mph. The rearend is an early front loader GM used from '55 thru '64 . When I bought a pinion seal, and gave the guy at the parts counter the part number off of the old seal, it referenced a '57 chev. Now if I ever blow it up with those super stock style burnouts I'll have an idea what ratio to look for. Of course I would tear it down and do a tooth count to confirm, before I ordered any parts . Allan
I thought you had a corporate 10-bolt rearend (don't ask me why I thought that), the 2.41 was a fairly common ratio for them.

But I cannot remember a '58-'64 application that would have had a 2.41 ratio. That ratio wasn't used during '55-'57, 3.36 was as high as they got IIRC. I know it prolly doesn't matter that much one way or the other but I wonder if there was a 2.41 used from the factory during the "Hotchkiss" era.
12-23-2011 10:24 AM
whyholdback You guys are forgetting about the OD. I didn't bother figuring out the actual gear because the OP indicated a definite lack of interest.
Figuring 2.41 is close, because a 3.42:1 axle with the 700R-4s 0.70:1 OD gives 2.38:1
In which case, the correct speedometer gears are a 17-tooth drive gear, and a 44 tooth driven gear.
12-23-2011 10:03 AM
adantessr
Quote:
Originally Posted by BigEd36
Big Al, glad the cam change gave the results you were after. Did the cam give you a bit of "rump rump"? I remember that you were hoping for a bit of "idle music".

Big Ed
Big Ed. Just a little. Sounds really nice. Not quite the smooth as a Singer sewing machine sound that it had. I really don't think that I could have made a better choice as far as cams go. If I bring the car up to 40 mph and then let off the gas so that it switches into overdrive and then switch on the lockup clutch in the torque, the rpm drops way down to about 1100 or 1200. Then I set the cruise control. So I wouldn't want anything more radical. I was surprised to have that much vacuum loss though. Used to have almost 21 in hg, now is just a little over 15 in hg. Not a concern, just a little surprised. Allan
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