Project Blown 305

[Cuttyman9]

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

[TJ's GMC]

Originally Posted by bigblockv6

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

THAT and a supercharger!

[Cuttyman9]

Any links to the specific conversion parts page?

I only had luck finding people asking about it

[Cuttyman9]

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!

[TJ's GMC]

Little progress is better than no progress.

[Cuttyman9]

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.

[Cuttyman9]

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!

[bigblockv6]

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

[Firepower]

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.

[Cuttyman9]

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.