Stock 307 to ????

silverfox · Sep 17, 2014

I have spent a lot of time reviewing all the swaps on the forum and I am at a loss for what is the best but yet budget friendly. I can do most of the work my self however I no longer have access to a garage. So I am looking for information for what is the best swap and if anyone can help with sending me to someone who can/has done this before.

I am looking to keep this a semi daily driver and enjoy driving on highway to the ocean and to work often. Want to have enough power to be able to keep up with the Rustangs and imports for a little bit. (i am not going to race the car) I need realibility and budget. I would prefer to go M/T also. I am not looking for a complet parts list right now as i see several of these already on the forum. Just if you have a swap or know someone who does in a Gbody what is it and how is it holding up?

Thank you

82GPLJ455 · Sep 17, 2014

Easiest swap for you would be olds to olds.an olds 350 or 403 will drop right in with no other changes needed.

olds307 and 403 · Sep 17, 2014

X2. Everything swaps over. A stock 403 bottom end, early 330 or 350 heads with a cam upgrade is a common, potent swap. For manual transmission, look for the late 70's bell housing that came on the Olds 260 with a T50 trans. There are new pedals and new flywheels available for the Olds V8. Your trans choice depends on budget.

DoubleV · Sep 19, 2014

silverfox said:
I would prefer to go M/T also.

What does this mean?

FE3X CLONE · Sep 19, 2014

DoubleV said:
silverfox said:

I would prefer to go M/T also.

Click to expand...

What does this mean?

I'm guessing he meant 'manual transmission'.

silverfox · Sep 19, 2014

yes manual transmission

QS442 · Sep 19, 2014

I agree that the easiest swap will be a Olds 350 or 403. The 455 with a manual trans isn't just a bolt in swap. I was considering a 455 mated to a Super T-10 but have changed my plans to 403/T-10 swap due to the simplicity of the small block Olds going in place of the 307. I am now gathering all the parts to complete the T-10 install now. You need to figure out what trans you will be using, whether or not you going hydraulic vs mechanical, shifter, console set up, find pedals/linkage and small other things also to make the manual trans goal possible.

88hurstolds · Sep 19, 2014

A 455 drops right in and all the 307 stuff bolts up with exception to the AC bracket which just needs two tabs extended.
The only barrier is your pocket book for headers but you can just run W/Z manifolds or stock exhaust manifolds.

Here's my build, did it over a weekend using the 307 exhaust and stock 455 exhaust manifolds.
You can upgrade those later as you go but to get another plant in place simply can be done in 1 day if you know what you are doing...

http://www.gbodyolds.com/forum/showthre ... 9-455-Swap

More info on overdrive trans and AC

http://www.gbodyolds.com/forum/showthre ... ise-and-AC

rustyroger · Sep 20, 2014

88hurstolds said:
A 455 drops right in and all the 307 stuff bolts up with exception to the AC bracket which just needs two tabs extended.
The only barrier is your pocket book for headers but you can just run W/Z manifolds or stock exhaust manifolds.

It fits without much trouble, but it is significantly heavier, you might need to upgrade the suspension and brakes, and it will generate more heat, so you will need a radiator capable of dealing with this.

I think I can remember a/c cars needing the firewall modified as well, and hood clearance could be a problem depending on your carburettor and air cleaner setup.

To keep things budget friendly I would use a sbo just for not having to worry too much about weight issues or cooling problems. If you put in an engine that makes much more power than your 307 you might need to upgrade the cooling system anyway.
It's the laws of physics, gasoline engines are heat engines that create power by burning fuel, the more power made the more fuel is burnt, therefore more heat to be dissipated.

Roger.

442Classic · Oct 2, 2014

SBO roller cam, pocket port the heads, and put some compression to it.

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Stock 307 to ????

silverfox

Master Mechanic

82GPLJ455

Greasemonkey

olds307 and 403

Geezer

DoubleV

Royal Smart Person

FE3X CLONE

Comic Book Super Hero

silverfox

Master Mechanic

QS442

Master Mechanic

88hurstolds

Royal Smart Person

rustyroger

G-Body Guru

442Classic

Not-quite-so-new-guy

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