Re: Project Blown 305
 

I'd like to stay manual, it's more fun and usually can handle a lot more as far as trucks go.

It's an SM 420 right now.

Now the part I'm concerned about is mounting a divorced Tcase setup as is have to create all the mounting and link the two together somehow I would assume with another driveshaft between em.

Re: Project Blown 305
 

Basically short of an nv4500, np435 or np420 I kinda am a noob to 4x4 transmissions.

Re: Project Blown 305
 

All the newer stuff has married transfer cases. Most manufacturers started marrying transmissions and transfer cases in the later 60's. I mentioned some exceptions in an earlier post.

GM went to left side (front axle) drive starting with the GM T400 trucks in '88. If you use a transmission/transfer case from one of those trucks, you'll have to use a Ford front driving axle if you are going to go with a straight axle. Somewhere a long the line, Dodge went to left side drive too (maybe '94?). My 97 Dodge has a Dana 60 front axle with left side drive.

Some GMC 305's had Chevrolet automatic transmissions behind them in the mid 60's, so sourcing the necessary parts would allow you to use a 700R4 or 4L80E Overdrive automatic behind your engine. The older 700R4's don't use a computer to control them (pre '94), so using one of those would be easy. 4L80E's are electronically controlled, so a stand alone controller is necessary (expensive), or there is a kit to make it a full manual shift.

The 700R4 can be built strong with aftermarket parts. The 4L80E is strong enough as is. Many 4 WD trucks came with these two transmissions, so finding one with a transfer case attached is easy depending on where you live. (they are all over up here in the snow belt)

Re: Project Blown 305
 

Interesting, I'm aiming for a manual.

I'm okay with a divorced or married one although married would be simpler overall.
Initially I hadn't though about doing it that way.

I did find a Dana 60 front from a Ford F-350 from the 70's.
That probably would be better than the 10 bolt I have but I don't know much about closed knuckle front axles.

Re: Project Blown 305
 

Dana 60 is the strongest. I prefer the closed knuckle axles as the axleshaft u-joints run in gear oil and are protected from outside contaminates. The closed knuckles disappeared when disc brakes were installed. (at least with GM)

Re: Project Blown 305
 

Ah gotcha, I may have to consider it then since it's really cheap and at this stage the only real downfall is I'd have to hope Fords frame is the same width haha.

Bigblockv6 I didn't realize you're relatively nearby.
Pretty cool!

Re: Project Blown 305
 

It is. These old ones are all 34" frame rails.

Re: Project Blown 305
 

Interesting, guy claims it's a 74 closed knuckle drum

So long as it's able to be converted to disc I don't care if it's from something else.
I may run a divorced T case so if that's the case I should be able to find a driver side drop.

http://i1307.photobucket.com/albums/...psi1pgvtmi.jpg

This would prolly suit the build far better cuz I was thinking if this turns out to be a blown 478 even it's going to put enough torque to hurt just about any front axle.

Re: Project Blown 305
 

Blower and the adapter are here!!

http://i1307.photobucket.com/albums/...psjrih1ikw.jpg

http://i1307.photobucket.com/albums/...psxoi0emql.jpg

http://i1307.photobucket.com/albums/...pslcp0ots3.jpg

Re: Project Blown 305
 

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.

Re: Project Blown 305
 

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.

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

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

Re: Project Blown 305
 

Hope you get it! I had the chance to get one for cheap, but passed because it was pretty rusty. Parts are scarce to.

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?

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.

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:ok: Here's a pic of my custom 478 flywheel:upyes:

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.

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:upyes:

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

Re: Project Blown 305
 

Having trouble finding the conversion parts for sale. In the trans section it just lists what they came with from the factory.

Re: Project Blown 305
 

THAT and a supercharger! :teehee:

Re: Project Blown 305
 

Any links to the specific conversion parts page?

I only had luck finding people asking about it

Re: Project Blown 305
 

Going slow.
Been tinkering on a few other projects (trans am is pitching a fit, celica is getting closer to being v6 powered and the Z is closer to drivable lol)


Did source the tubing. The blower is awesome to stare at!

Re: Project Blown 305
 

Little progress is better than no progress. :thumbsup:

Re: Project Blown 305
 

Definitely!

The truck hasn't seen much but the celica trans am and Z have seen a ton and the weird swap for the chevelle is gathering parts fast(although you guys will not like that idea, especially what's his face that was blasting me for building a v6 over a Chevy 8 lol, might make him cry!)

The celica is so close to having a 3.5L V6 and the 300zx is close to one piece and almost road legal.
The firebird is eating starter gears and flywheels but at least i have it almost in one piece and close to running well.

Another thing I came up with, so given I had the 3D printer I'm thinking it might be advantageous to print myself a piston, rod and crank throw to test fit to see if I can really offset grind to 5.18" stroke.
I think that shouldn't be a difficult task I can glue in whatever Isn't printable to match the crankshaft.

Re: Project Blown 305
 

478's are mine, my plan is currently to try to swap one 478 in to replace the 350 Chevy, I need a 379/432 flywheel if anyone has the small one.

That's the main hurdle, I'm going to rock the stock manifolds since I don't want to build two sets of headers (one set for magnum heads and another when the blower stuff comes together for the standard ones)

Magnum heads don't work for me so I'll have sets for sale.

Progressively getting there!

Re: Project Blown 305
 

You will need a 379 Flywheel for a bolt on installation or an early 62-63 478 flywheel that can be modified. The 432 Flywheel is much larger in diameter and won't fit in the light duty truck bell housing. The other alternative is a custom Flywheel which is the route I chose but it must be balanced with the whole reciprocating assembly, a pic of the custom flywheel is included here:upyes:

Re: Project Blown 305
 

A couple points on the crank plan:
2" SBC journal is pretty small, for strength and for lack of journal overlap. Add a blower and cracks are almost a certainty.
Reducing journal size by offset grinding only adds the amount of stroke that journal is reduced by, not double. 2.2 BBC gives up to .600 more stroke, .300 throw. Welding would allow more, obviously, and/or bigger journals.
7.2" rods stock, easy enough to source longer BBC/BBM spec ones.

Sonic checking any old iron block is a good idea. It's not improbable that it would go .125 over with meat to spare. 5.25 Continental aircraft pistons are light.

Re: Project Blown 305
 

If you move it out 0.811 on one throw (2.811 to 2.0) double it and it gives you the stroke increase since that would be the bottom and the top of the cylinder.

We shall see what the machinist recommends. If he says it's doable I'll give it a shot.

It won't see much more than 8psi.
No need to spin a big roots that hard.

I've got a headgasket lined up. Cometic will do copper ones if I send in my old one.

Je said they can do pistons around that size.

Rods will be interesting as is prefer to buy em off the shelf.

Re: Project Blown 305
 

By reducing it .800, you move the center by .400, that you double for stroke.

Not much for budget over 7.200, so unless the custom pistons are also super tall deck height, it'll get pricey.
http://www.ebay.com/itm/Crower-7-500...-/200736254535

I get custom Cometic gaskets often, and also plan on for the 478+

Re: Project Blown 305
 

Yes, my mistake.

Either way, I'm not concerned about the crank.

I would be buying eagle rods or something like that.
Highest quality stuff is not important as this won't see over 4500 rpm.

Re: Project Blown 305
 

When you go to order head gaskets, let me know as I would like to buy a set as well. It might be cheaper if we order a couple sets...

Re: Project Blown 305
 

Will do.

Re: Project Blown 305
 

Did you ever get your V6 emblems? I've got a pair I might be willing to part with.

[IMG]http://6066gmcclub.com/picture.php?a...pictureid=4313[/IMG]
http://6066gmcclub.com/picture.php?a...pictureid=4314

Re: Project Blown 305
 

I did, thank you!

Still tracking down some horn stuff from an old C50 or something and the roof lights(if they are metal housings)

Re: Project Blown 305
 

As in roof lights I have a quite few used ones if you're in need of any:upyes:

Re: Project Blown 305
 

Do you have any pictures of them?

I'd like to put 5 on the roof and mounts some horns like the big trucks have maybe hook those up to an air compressor (as if the blown v6 truck on 40'a isn't enough to get people out of the way haha)

Re: Project Blown 305
 

They're the same ones that are on my 68, I bought a whole bunch of them about 11 years ago. They just don't have the rubber base boots like my 68 does which were factory installed. I'll dig them up this weekend and see what I got, I also have the factory GM diagram with the correct mounting instructions which include measurements.

Re: Project Blown 305
 

Pm me some pics, I can probably make my own plastic isolators or something.