Thread: 307 to 383?

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Hi guys,
I am currently running a 307 chev and sludgeomatic in my Ute here in Australia.
Down the track I may drop in my 327.
This will mean I have the 307 to play with.Now i think it is a small journal 2 bolt mains.
Could I or should I be able to put a 383 stroker kit in it?
Would 4 bolt mains be better?
Can 2 bolt be converted cheaply to 4 bolt?
Am i wasting mine and your time?
Any feedback would be great.
Ps:I wish I could play with this in the States.Your parts are sooo
plentiful and cheap.Youd nearly think V8's came from there.lol.
Cheers
Shane.

Gday Shane.

Your 307 is a large journal 2 bolt main, 307 only come this way.
You could put a 383 crank in there but you would need custom pistons cos of the bore size.
You need a 327 L.J. block or a 350 block to make 383 cubes.
4 bolt main depending on the power you want.
Thanks Sam
By the way i live in Victoria

Cheers mate.
would my 327 heads go on a 350 block as a 383?
May just have to look for a gunka 350 to play with.
Cheers
Shane.

Originally posted by Ozziuteguy
Hi guys,
I am currently running a 307 chev and sludgeomatic in my Ute here in Australia.
Down the track I may drop in my 327.
This will mean I have the 307 to play with.Now i think it is a small journal 2 bolt mains.
Could I or should I be able to put a 383 stroker kit in it?
Would 4 bolt mains be better?
Can 2 bolt be converted cheaply to 4 bolt?
Am i wasting mine and your time?
Any feedback would be great.
Ps:I wish I could play with this in the States.Your parts are sooo
plentiful and cheap.Youd nearly think V8's came from there.lol.
Cheers
Shane.

WHAT'S A UTE?

Hey, I know that answer!! Just a clever way for the Aussies to disquise another chebbie truck !!!!!!!!!!!!

i think a UTE is similar to an El Camino/ Ranchero

Yup, like I said. Another cleverly disguised chebbie truck.

Originally posted by Ozziuteguy
Cheers mate.
would my 327 heads go on a 350 block as a 383?
May just have to look for a gunka 350 to play with.
Cheers
Shane.

A 383 uses a very large main journal Chevy 400 crank. The cranks are turned down to the nominal "large" main bering size used in 68 and later 327s, 305s, and 350s. To my knowledge, no one turns down to the small journal size. Forget about using your small journal block to build a 383.

327 and 350s have a 4" bore. You can use your 327 heads on a 383 but you need to watch your compression. In my opinion, you would be better off buying some aftermarket cast iron heads with hardened valve seats.

If your 327 is a 68/69 (late/large main journal crank)) version it will have a 2 bolt 350 block.

You can fit "splayed" 4 bolt main caps to a 2 bolt block. But it is expensive. The caps must be fitted, the additional bolt holes drilled and tapped, and the block line bored. You actually wind up with a block that is stronger than a factory 4 bolt. But why? 2 bolt blocks are good to over 400 hp.

My recommendation. Find a good 350 2 or 4 bolt block. Use an aftermarket internally ballanced crank and after market street replacement replacement heads.

I have a mild 350 in my roadster. Good heads, a little cam, and headers. About 300 HP. And that is more HP than I have guts.

Ta heaps for the info.
Yep a Ute is short for Utility.
I guess ours are a shrunken El Camino in a way.
You could go to the General Motors Holden website to see what sorta cars the genereal does over here.
Regards
Shane.