Project Blown 305

[Cuttyman9]

Here's the not-so-official mock up:















Excuse the water everywhere but it looks quite promising.

I've found a few places selling tubing that would actually just plop into place so I may just do that although moving the blower up might be cooler too.

It looks promising, the adapter is on its way and I'll be buying a blower tomorrow and the front cover.
What's cool about the adapter is it will work perfect as a template to drill the big steel chunk so I can just bolt it down and not worry about the angled bolt holes that would almost require a machinist to do.

By running an 8v92/71 I should bridge some of that gap (11" from the front of that plate to the crank balancer flange lol) they offer up to an 8" long snout so I should be able to make this work.


Meanwhile my friend donated these to the cause haha




Needless to say, this is exciting.

Kind of tempted to find a 478 diesel or gas block/crank to make it that much more insane and also allow me to get started on the machine work.

[Cuttyman9]

Might have to add to my list...

-478 block/crank somewhere nearby
-Scoop of some kind to match up with two carbs

[TJ's GMC]

Cool stuff man! Perrty excited here to, that's gonna be sweet!

[AZKen]

You are building a "Hot Rod"? Wonder why the drag racers never used the 305? Wonder why they never put a blower on one? Hmmmmm. I wonder if it's because they are so heavy? Or if they won't rev. If they were not built to rev? If they would "blow up" with a blower? I just wonder. Maybe they are good for just hauling like all the ads say. Don't know. Good questions though. Trying to completely redesign a motor is possibly a huge waste of time and money. If a person wants a hot rod motor, they are already talking Chevy. So why stay with original if it's no longer an original 305? Are you building a Chevy inside a GMC? That won't work. There will be no "HOT" in your hot rod. A Chevy 350 with minor upgrades will blow your tailgate off. You are talking more torque. Torque without revs will not produce horsepower....as in: hot rod horsepower.

[Cuttyman9]

People usually don't go after certain engines because if the application it's used in is not common for being hopped up people usually don't build aftermarket parts regardless of the merit of the engines.
Typically the most often hot rodded stuff is what's most readily available which would come down to chevys and hondas. Coincidentally the owners happen to be typically the most sensitive. Wonder if there's a correlation.
I'd bet you'd love what I'm putting in my chevelle, anyways, I digress.

The common hot rodded engines aren't picked because of design it's because of ease/cost of attaining them.

At the end of the day if this thing runs and looks pretty (which there's no way it won't with an 8v92 on top lol) I'm content, to me it will be far better than any Chevy product could ever be no matter the output.

[TJ's GMC]

Love'd yer comment Cuttyman,

Diesel engines don't rev, yet a 5.9 liter 12 valve cummins is easily capable of putting out 1500+ torque and 800+ HP all under 3,000 RPM. And that is with a boat anchor bottom end and heavy pistons. Yes, it has a slight cubic inch advantage.....but he only mentioned Revs. And an 8000 RPM 350 would have no stinkin chance. lol

So, someone please explain to me why a v6 wouldn't respond the same way? YES I know...this is Gas and not diesel....But:

A turbo charged 292 on 10 PSI puts out over 350 HP and 450 Torque. Different engine design, but in the Long run....quite similar.....a Truck engine.

Now, considering the 305 v6 is low compression, Adding compression would be a way to make power without the need for more revs. Not to mention you are going to be putting in lighter pistons and lightening up the crank which would easily allow for more top end!

Back to that read up of the guy who hotrodded that 478! It would toast 454's and was capable of 5500 RPM! SO, how come the 305 isn't capable of toasting a 350???

Any engine can be improved, already it's well known that a 500 cfm 2 barrel and dual exhaust is a nice improvement......so a few pounds of boost won't hurt a thing.

Cuttyman, how much boost will that supercharger put out?

[Cuttyman9]

I don't really have a goal output for the SC, probably just 5psi to start and see how well it works.

Kinda depends on a few factors cuz if the bores aren't in too bad a shape I may try to clean it up and run it stock on boost to see what it can do/handle.

If all else fails I'll grab another and start over.


Here's what's coming out once the v6 is ready.


Here's the trucks clean side lol


And the other side.
I'm hoping the blower won't be forward enough to require me to remove the 56 Chevy hood emblem.



Planning to keep the exhaust like this but more than likely I'll upsize the rest of the tubing (2.5" straight from the long tubes)

[AZKen]

You kids have fun now. Don't eat too much ice cream. Chat it up some more, it's cute.

[Cuttyman9]

I agree. I'm going to aim for 50 percent underdriven as I'm still learning the ins and outs of these big blowers.
When I get the whole thing together and it runs smooth I might try pushing it a bit more.

When i get to a fully built setup I'll try for more to see what it can do. The joy of the big blower is I can spin it slow and still make a good amount of boost.

Either way I stoked. The blower is on its way as is the front plate and adapter.


Also I'll probably still the main plate for the same pattern as the top of the blower so I can plop the dual quads on for a startup setup so I can get it running without the complications of the blower.

[TJ's GMC]

Originally Posted by Cuttyman9

I agree. I'm going to aim for 50 percent underdriven as I'm still learning the ins and outs of these big blowers.
When I get the whole thing together and it runs smooth I might try pushing it a bit more.

When i get to a fully built setup I'll try for more to see what it can do. The joy of the big blower is I can spin it slow and still make a good amount of boost.

Either way I stoked. The blower is on its way as is the front plate and adapter.


Also I'll probably still the main plate for the same pattern as the top of the blower so I can plop the dual quads on for a startup setup so I can get it running without the complications of the blower.

What are you gonna use for the dual quad setup?