478 cu in V6

[squirrel]

Re: 478 cu in V6

I know one guy who has a Jimmy V6 in his mid 60s Chevy pickup. I know a couple guys who had stock GMCs with the V6, I worked on their trucks, but its' been several years ago. The V12 is bitchin...but it's kind of long and heavy for the cubes.

[Cuttyman9]

I'm picking up two 478 v6's

I've accumulated a ton of specs.
The internals are massive... I think if my tape measure skills from the crank center to deck surface it has an 11.5" deck height.


Valve spring
installed height=2.141"
Od 1.367"
Wire od=.0188

Lifter
2.317" tall
0.988" od

Pushrod
7 13/16" long

Shaft
17 7/8"
0.791" od
0.496 id
Multiple 0.1" oil holes
0.335" hole at each end

2 bolt pedestal
2.233" tall
0.385 bolt hole
0.972 hole to hole min
1.119 shaft hole to base
0.791 shafthole

One bolt pedestal
0.147 from small from top to flat
Depth of 0.814"
0.84 from oil hole to round face
Roundface to flat 0.112
0.166 offset boot hole to oil hole

Rocker
2.719" tip to tip
1" thick



Valley cover
19"

Rockers
Width=1.01"
Hole od=0.789"
Distance between= 3.3"
Cap width=1.226"
2.75" length


73-up
28" between rails(inside of C)


702 v12
-3.124" mains (thunderV12.com)
-1.6" pins
-~7" rods
^last two are from (http://www.bangshift.com/forum/forum...cu-in-v6/page2)

Confirmed 1.24" OD wrist pins
2.811 rod journal
^http://www.bangshift.com/forum/forum...3-478-cu-in-v6

-Exhaust Valves
New Old Replacement Stock (NORS) made in USA by TRW.
* Head Dia 1-53/64
* Stem Length 5-13/16
* Stem Dia .434
* Type Grooved
* Seat Angle 45°
TRW SC2330N
GM 2383318
^ebay listing 221603150615

Melling exhaust valve
* Head Diameter: 1.565
Oriellys V0580

Intake valve guide
* Vintage
* Standard Size
* 0.342 Inch I.D.
* 2.75 Inch Overall Length
* Guide Type: Plain
* Inside Diameter (In): 0.342 Inch
* Inside Diameter (mm): 8.687
* Outside Diameter (In): 0.502
* Outside Diameter (mm): 12.751
Oriellys VG5037

Pushrod
* 7.989 Inch Overall Length
Oreillys RP3099

Pushrod
* Diameter (In): 5/16 Inch
* Length (In): 7.645 Inch
Oreillys MPR121





211-2036 CLEVITE intake valve
fits GMC:
351cid v6, 1964-1967, Diesel Engines, 2.260" Head Diameter
351cid v6, 1966-1969, 2.260" Head Diameter
401cid v6, 1966-1972, 2.260" Head Diameter
432cid v6, 1973-1974, 2.260" Head Diameter
^ebay listing 371009149096

-Intake valve-
* Head Dia 2.160
* Stem Length 5.849
* Stem Dia .3725
* Seat Angle 30°
* Sealed Power V1563
^Ebay listing 221587715714

Intake valve (305)
* Head Dia 2
* Stem Length 5-13/16
* Stem Dia .341
* Seat Angle 30°
* Type Lock Grooved
* TRW V2327
* RMC V3257
OEM GMC 2368098
^ebay listing 321679596667

2474281 pn rod 478
^eBay listing 282243468585

Con Rod Bearings
6200CP
0.020" / .50mm Con Rod Bearings
OD 3.016"
ID 2.8117"
Length .935"
Wall Thickness .1010/.1015"
^ebay listing 321887078220

"New old stock piston set for GM 351 V6 truck engine from the 60's.  Includes 6 pistons and pins, ring set and pin clips.  
4 9/16 bore,
approx 2 9/16 comp. height,
approx 1 1/4 pins.  
Parts are in good condition."

^ebay listing 322341673092

[Cuttyman9]

There was a bit of mixed up info but I think overall there's a lot of solid info there.

My plan is to trim the rod journals down to BBC or sbc size, use some inexpensive rods, the longest ones I can buy, and go to about 9-1 for use with an 8V92 blower I picked up.

I'm hoping to pick up some cubic inches as well along the way hopefully well over 500ci.

I have a sheet metal blower manifold already waiting to be welded together. In the process now of redesigning the water crossover (to keep it low and out of the way of the blower belt) and a timing cover that eliminates the water pump and utilizes two electric pumps.

[Monster]

I'm picking up two 478 v6's

Wow, you dug deep back to 2009 .. but welcome to BS, we look forward to your project.

[Dan Barlow]

Wow, you dug deep back to 2009 .. but welcome to BS, we look forward to your project.

For sure on both accounts ! I missed it the first time so I'm reading the beginning and all a sudden I lookvat the dates !

[Dan Barlow]

And do better than Jim ( Squirrel ) we need pics !

[silver_bullet]

Re: 478 cu in V6

Is this anything a kin to the GMC V6 that made it's way into pickups in the 60's?

Yep! somebody swapped one in to a 68 gmc 2500... "Hold Mah beer and watch this!"https://youtu.be/uvvFks-6qrk

[Barry Donovan]

Ironically, found some modern chores done to the size under the 478 on you tube recently..
better ignition, a four barrel adapted.
electric fuel..
sounds damn good.

There was a sticker for the 305 v6, the old checkered flag and that french symbol..
some think it was for the v8,as the v6 was so obscure...and it isn't (the 305 v8, never got that sticker)
Glad to see a build revived.

this video is from just last may.

[Cuttyman9]

Haha yeah, well as you can guess the info on these is scarce so any time I get the opportunity I jump at it.

I love that this thing has 0 support currently short of an HEI conversion and some laser cut flanges lol.

6-71 to 8v71 blower adapter


The new 8v92 blower I picked up



The truck everything's going into (grungy yes but these days people pay for this kinda patina lol) note the exhaust haha



Mocking everything up on the 305 I picked up
Works out well as the person I grabbed the blower manifold parts from had cut them for the normal non-magnum heads so I'll be putting these on the 478 but with big valves



Going to have a new timing cover made to shorten how far the blower hangs over the front of the engine, also a water neck to match.



Blower kit parts I picked up, this is why I bought the adapter plate so I could lay it over this and drill it vs having to drill angled holes in it and get it correct.



I picked up 3 eaton axles because I love their design and the pinion is gigantic.
I'm planning to have one cut up merged with a Front D60 outer bits and stuff under the front.
I'm keeping the coil spring rear but flipping the housing (drop out can fit on either side, right side up or upside down so this will flip the perches) and bumping up the ride height



Hopefully that will all work out, I still need to find a divorced 205 Tcase for the thing so I can keep using sm420's and maybe swap to a nv4500/5600 in the future.

[Monster]

This thing is going to be a torque monster !

[TheSilverBuick]

Nice! 3,500rpm, 10,000lb/ft of torque

[Cuttyman9]

Yeah, I've played around with the numbers, if I use a 2.0" journal size and the rod journal is 2.811" I should pick up enough stroke to get to 686ci roughly with a .030" overbore.
The blower is just for fun, if it's ineffective it's fine. It's mostly to make it look that much more radical.

This is most of why I chose to use an eaton at both ends, I can use Detroit lockers from 14B's and they are supposedly indestructible.

Hopefully it works out to be a solid tow rig haha and something no one has seen before.

[CTX-SLPR]

You going to keep the PY0's on that rig when you swap the axles or get something different?

[Cuttyman9]

Py0's?
I have a 10 bolt I'll steal the leafs from and get this conversion kit to weld on the mounts for the front

[silver_bullet]

PYO's are the aluminum GM rims that appear to be on the front of your truck.... another option is Hummer H2 rims with PYO center caps....