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trbomike 10-19-2006 07:34 PM

Building a 283 into a 302 or 327
 
Hi all. I'm new here and have been away from SBC's a long time! I have a 64 283 that I would like to build into either a 302 or a 327. From what I've read, to make a 302 I just need to bore it out; for a 327 I need to bore and get 327 rods. Is that correct? Any help greatly appreciated.

Mike

CNC BLOCKS NE 10-19-2006 08:09 PM

Quote:

Originally Posted by trbomike
Hi all. I'm new here and have been away from SBC's a long time! I have a 64 283 that I would like to build into either a 302 or a 327. From what I've read, to make a 302 I just need to bore it out; for a 327 I need to bore and get 327 rods. Is that correct? Any help greatly appreciated.

Mike

The 283 rods will work and your crank all you need is the correct pistons and the crank would need to be rebalanced as the pistons are heavier then the stock 283 pistons.

The block may work but the only way to tell is to have it sonic tested to see how thick the cylinders are.

There are better after market rods out there then the old 283 rods.

I have a brand new small journal crank 3 inch stroke and a brankd new set of 302 standard bore 11:01 pistons and rings and a set of 327 rods if your interested PM me,

johnnya 10-20-2006 04:44 AM

To make a 327 out of a 283 block requires boring the block to 4" and using a 327 CRANKSHAFT, not rods.
As far as I know, the rods are the same.
You can accomplish the same thing by using a 350 block and a large journal 327 crank or a 307 crank. If you choose a 4 bolt 350 block you'll end up with a 4 bolt 327.
JA

302 Z28 10-20-2006 05:36 AM

First off, not all 283 blocks can take a 4" bore. The block needs to be sonic checked to see if it can go that far. A 327 requires a 3.25" stroke crank as opposed to the 283 and 302's 3" stroke crank. If you are after a 302 you would be much better off using a 350 block.

There is not that much of a performance differance in boring the 283 .060" as opposed to .125". The .060" bore with the 283 crank will produce a 292 and will allow enough cylinder wall material to remain.

Vince

CNC BLOCKS NE 10-20-2006 07:03 AM

Quote:

Originally Posted by 302/Z28
First off, not all 283 blocks can take a 4" bore. The block needs to be sonic checked to see if it can go that far. A 327 requires a 3.25" stroke crank as opposed to the 283 and 302's 3" stroke crank. If you are after a 302 you would be much better off using a 350 block.

There is not that much of a performance differance in boring the 283 .060" as opposed to .125". The .060" bore with the 283 crank will produce a 292 and will allow enough cylinder wall material to remain.

Vince

To put a small journal crank in a 350 block would require special main bearings.

trbomike 10-20-2006 07:17 AM

Building a 283 into a 302 or 327
 
Thank you all for the input. I guess I should have stated this is a 65 Nova and I want to use an original block for appearances. In case you weren't aware, the oil filter is cut higher into the block, and there is a threaded hole in the side of the block where the clutch ball for the z rod goes. So a 350 is out. It really doesn't matter to me what size I end up with. I can bore it .060 and use what I have with new pistons. I'm not going to thrash it; I'm really just after the original look. So, bore it .060 over and stay with all the stock internal lower end?

CNC BLOCKS NE 10-20-2006 10:30 AM

Quote:

Originally Posted by trbomike
Thank you all for the input. I guess I should have stated this is a 65 Nova and I want to use an original block for appearances. In case you weren't aware, the oil filter is cut higher into the block, and there is a threaded hole in the side of the block where the clutch ball for the z rod goes. So a 350 is out. It really doesn't matter to me what size I end up with. I can bore it .060 and use what I have with new pistons. I'm not going to thrash it; I'm really just after the original look. So, bore it .060 over and stay with all the stock internal lower end?

Just make sure you have the cylinder sonic tested befor you do anything so later on you won't end up with a pile of junk.

302 Z28 10-20-2006 03:25 PM

292's can be made to run as good as a 301 if you choose the right parts. I had a 56 210 sedan in high school that the 292 was built by a friends dad who was a dirt track racer. I never knew exactly what he did to that engine because it never gave me cause to go into it the whole time I owned it. I would routinely take it to 7K and power shift with no ill effect, except for straightened out alternator blades and a thrown belt.

Vince


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