papanewgz

I would like to build the330 with stock 350 chev pistons. Can I use the stock connecting rod from the 330? Will the wrist pin for the chev piston .927 fit the olds rod?






































































































































r to build the 330 with a stock 350 chev pistons

cutlassefi

[QUOTE=papanewgz;747750]I would like to build the330 with stock 350 chev pistons. Can I use the stock connecting rod from the 330? No Will the wrist pin for the chev piston .927 fit the olds rod? [Quote]No


Chevy 350 piston is shorter than the Olds 330. The best way to do it is to offset grind the crank to 3.50. Then use a 6.00" SBC Small journal rod along with the SBC 350 piston.

Run to Rund

Another approach using fewer changes would be to deck the block about .06", bush the Olds rods down to Chevy pin size.

cutlassefi

This may be your way of doing it but I wouldn't recommend that unless it was an absolute last resort. There are better, cheaper ways.

Buying new SBC rods is cheaper than reconditioning the stockers, the replacements are stronger and much lighter. Piston choices for 350SBC are abundant, to say the least. And by stroking the cranking you'll add cubic inches and most likely low to midrange torque. A win-win in my book.

papanewgz

where to get 6 inch rods for the chev pistons. and do you habe to grind the crank to the rod?

cutlassefi

Try Summit or Jegs. Look for a small journal Small block Chevy 6" I-beam rod like this
http://www.summitracing.com/parts/sca-2600020/overview/
Then offset grind the crank to a 3.500 stroke and small block Chevy Small journal size. Any good shop can do that no problem.

jag1886

I may be stupid but I have to ask WHY.

cutlassefi

Why what?

olds 307 and 403

A guy did this overseas, he liked how his car performed. It is done because there are only basic cast pistons available for the Olds 330. You can have a very strong, efficient package. A factory forged crank, 4340 rods and forged pistons with virtually any dish and a modern ring pack.

captjim

Like previously stated, 330 piston options are extremely limited. The 330 stock bore is 3.938", stock SBC 350 is 4.000", so .060 +/- needs to be cut out, requiring an extra bore. So, if you look at the added cost of the extra bore and offset grinding and balancing, plus new rods and pistons vs the expensive 330 pistons, reconditioning the 330 rods and pressing the pistons on, you end up with newer, MUCH better parts, more cubes, for just a little extra money. That is "why"

Octania

Well, you already HAVE 6" rods in your 330
How about getting forged W31 "350" 4.057" pistons instead of "330" pistons?
Or even 400 flat tops at 4.000"

What makes a "modern" ring pack that differs from the antique vintage ones- ring widths?

olds 307 and 403

Original and replacement 330 pistons use 5/64" vs 1/16" compression rings. Not only less drag but supposedly actually seal better.

captjim

The problem with 350 Olds pistons is that they require the block to be bored .120", that is a lot and is costly. Any core shift and you might get into trouble.

Are you talking Olds 400? If so, not many choices there, either.

cutlassefi

As Jim said why bore it to 4.057 if you don't have or want to.
Ring packs - yes thinner is now better. Plus thinner rings are typically available in different materials as well, not just cast with a moly face. You can get plasma moly, ductile iron, steel as well as different designs. You typically won't have those choices with a 5/64 ring.
Yes the stock rod is 6.00", but with a .980 pin, based on the stock Olds journal size and very heavy. Just an FYI, my 350, which was done 10 years ago, has a balance bobweight of 2248 grams. A typical 6.00' rod Chevy package is around 1900, huge difference. A recent Eagle rodded 455 I did had a bobweight of 2287. So that means a typical stock SBO rotating assembly is almost as heavy as an aftermarket BBO one, not good.

The Stickman

BTW I have a crank already done with flex plate. Been asking $350.