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GMC V6 and V12 Engines Engine repair and rebuilding

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  #91  
Old March 7th, 2017, 03:29 PM
bigblockv6 bigblockv6 is offline
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Default Re: Project Blown 305

Quote:
Originally Posted by ManicMechanic View Post
If your going the divorced route and pass drop you have a few option. The New process 200 from the 50s dodge power wagon is a good case and not to hard to come by. Also GM used a New process 205 that is good. They are both gear to gear cases with a 1.96 low range. If you want to go divorced and drivers drop your only real option is a ford New Process 205 but they are hard to find and harder to find hard parts for.
The problem with the Ford NP 205 is the front drive line output is on the driver's side, the NP 205 to use is from an earlier Dodge truck.
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  #92  
Old March 8th, 2017, 06:01 AM
Cuttyman9 Cuttyman9 is online now
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Default Re: Project Blown 305

Well I think I'm changing gears a bit in terms of front axle with the blower and the torque output of the v6 stock in going to need more heavy duty (also because if I can't find 4.10's for the eatons I'll have to run 40's lol)
So I located a place that would build me an eaton front axle.
I need to track down a local dana 61 from a 87-93 dodge 3/4 or 1 ton and an eaton rear axle with 4.10's and another drop out with 4.10's

It might be overkill but at least I can carry a spare drop out and get out of a bad situation and it will handle the big v6 output with the blower.


That thing sure is exciting to stare at lol.
I got the right tubing (turns out the port holes are 1.25x2.5 each and I found tubing to match)
I think since the magnum heads don't have a solid partition between ports I'll sharpen the bit between em and run a single port to the paired cylinders
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1936 Chevy master coupe 401/st400
1966 C20 350/sm420 (planning-blown 305/sm465 4x4)
1967 Chevelle (4.6L 4V/t56)
1971 Triumph Stag 3.0 v8/4 speed
1971 Cutlass 350olds/350
1975 Trans am 455/t56
1991 300zx TT/5 speed
1992 Celica GT (soon to be 3.5L/5 speed)
1999 F150 4.6/4w75 (soon to be supercharged)
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  #93  
Old March 8th, 2017, 06:02 AM
Cuttyman9 Cuttyman9 is online now
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Default Re: Project Blown 305

Located a 478 too btw
Should be able to build that one when I have the opportunity to go get it
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1936 Chevy master coupe 401/st400
1966 C20 350/sm420 (planning-blown 305/sm465 4x4)
1967 Chevelle (4.6L 4V/t56)
1971 Triumph Stag 3.0 v8/4 speed
1971 Cutlass 350olds/350
1975 Trans am 455/t56
1991 300zx TT/5 speed
1992 Celica GT (soon to be 3.5L/5 speed)
1999 F150 4.6/4w75 (soon to be supercharged)
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  #94  
Old March 8th, 2017, 03:33 PM
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Default Re: Project Blown 305

Quote:
Originally Posted by Cuttyman9 View Post
Located a 478 too btw
Should be able to build that one when I have the opportunity to go get it
Hope you get it! I had the chance to get one for cheap, but passed because it was pretty rusty. Parts are scarce to.
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1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust.
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  #95  
Old March 8th, 2017, 03:52 PM
Cuttyman9 Cuttyman9 is online now
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Default Re: Project Blown 305

Yeah, I'm going to use as much off the 305 as possible.

I'll keep y'all posted.


Side note, anyone have the horns and roof running lights off a big gmc truck? Like a 4000 series?
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1936 Chevy master coupe 401/st400
1966 C20 350/sm420 (planning-blown 305/sm465 4x4)
1967 Chevelle (4.6L 4V/t56)
1971 Triumph Stag 3.0 v8/4 speed
1971 Cutlass 350olds/350
1975 Trans am 455/t56
1991 300zx TT/5 speed
1992 Celica GT (soon to be 3.5L/5 speed)
1999 F150 4.6/4w75 (soon to be supercharged)

Last edited by Cuttyman9; March 8th, 2017 at 06:42 PM.
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  #96  
Old March 12th, 2017, 03:57 AM
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Default Re: Project Blown 305

Looks as though the bell housing pattern on this is the same as the big 6s so I really just need to adapt the 8 bolt flywheel to fit under this or see about a custom one since this bellhousing fits my truck.
I'll just order an RXT clutch from McLeod to insure it handles the torque.

Sadly my crank pulley and timing plate are bent so I need to look into sourcing those.

If I flip the pulley it should work perfect in adding extra clearance for the blower belt as keeping it close to the motor is ideal.

Now if I cut off all the water pump stuff and run an electric pump, would you guys happen to know of a powerful pump?
This would also shave some weight too.
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1936 Chevy master coupe 401/st400
1966 C20 350/sm420 (planning-blown 305/sm465 4x4)
1967 Chevelle (4.6L 4V/t56)
1971 Triumph Stag 3.0 v8/4 speed
1971 Cutlass 350olds/350
1975 Trans am 455/t56
1991 300zx TT/5 speed
1992 Celica GT (soon to be 3.5L/5 speed)
1999 F150 4.6/4w75 (soon to be supercharged)
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  #97  
Old March 12th, 2017, 04:45 AM
bigblockv6 bigblockv6 is offline
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Default Re: Project Blown 305

If you're going to use the 305E bellhousing you'll definitely need the right 8 bolt flywheel for the 478. There were early 8 bolt flywheels used on 62-65 6500 series trucks that were the correct diameter and if you got a hold of one of these it would require machining an adapter to accept the smaller light duty pilot bearing because the hole in the center is much larger. The other alternative is a 379 flywheel if you can find one which is a straight bolt in. Myself I went with a custom flywheel from Tilton Engineering and of course it was balanced with the whole rotating assembly of the 478M, a good amount of weight was added to the flywheel. Another issue I need to bring up is Tilton never machined the flywheel surface facing the engine block to clear the four bolts that bolt the bellhousing to the engine block, that machined relief area is very evident on a 305E flywheel. I ended up grinding down the heads of the 4 bolts to achieve the right clearance Here's a pic of my custom 478 flywheel
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  #98  
Old March 12th, 2017, 05:42 AM
Cuttyman9 Cuttyman9 is online now
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Default Re: Project Blown 305

Ah, well I may just do the custom route.
So I wanted to consider the NV4500 in this which requires an adapter so I may have to space out the flywheel anyways.

I'll def have some balancing to do because I think I'm gonna just shoot for a custom offset ground crank and different rods/Pistons. Knowing JE will make a custom 5.125" piston makes me more interested in that than to retain the weight of the giant 4 ring cast factory ones and I can jump to 8.5-1 compression ratio.
__________________
1936 Chevy master coupe 401/st400
1966 C20 350/sm420 (planning-blown 305/sm465 4x4)
1967 Chevelle (4.6L 4V/t56)
1971 Triumph Stag 3.0 v8/4 speed
1971 Cutlass 350olds/350
1975 Trans am 455/t56
1991 300zx TT/5 speed
1992 Celica GT (soon to be 3.5L/5 speed)
1999 F150 4.6/4w75 (soon to be supercharged)
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  #99  
Old March 12th, 2017, 06:08 AM
bigblockv6 bigblockv6 is offline
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Default Re: Project Blown 305

Don't think you'll need to space out the flywheel, NV-4500 conversions have been done before on these engines. Go to Jolly's 6066GMCguy.org site, there is an NV-4500 conversion in there. Some custom pistons with 3 rings, Chrysler 426 Hemi type rods with a turned down and stroked crankshaft will result in a 500 plus cubic inch screaming V6
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  #100  
Old March 12th, 2017, 07:39 AM
Cuttyman9 Cuttyman9 is online now
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Default Re: Project Blown 305

Yeah, I considered that from
The other build but there might be more available in a sbc rod journal (2.0") to pick up 1.6" stroke over the 478 stroke for I think roughly a 678
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1936 Chevy master coupe 401/st400
1966 C20 350/sm420 (planning-blown 305/sm465 4x4)
1967 Chevelle (4.6L 4V/t56)
1971 Triumph Stag 3.0 v8/4 speed
1971 Cutlass 350olds/350
1975 Trans am 455/t56
1991 300zx TT/5 speed
1992 Celica GT (soon to be 3.5L/5 speed)
1999 F150 4.6/4w75 (soon to be supercharged)
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