Chevy rods?

Ive been searching the interweb for possible rod piston combos for the Aussie 250 and theres a lot of conflicting info out there i found someone who said they used chevy rods. I can see how the crank big end could be turned down and the small ends bushed to suit but theres a big diference in Big End width. From memory the 250 is.990 and the chevy .940(correct me if im wrong)I understand Speedway Guys are doing this maybe someone on this site can fill me in.

The B/E for the 250 rods is 1.030"wide, and the SBC rods are .940. The 250 rods have a smaller housing bore of 2.125", the same as the 283 and early 327 V8 rods, and are called small journal, and the later V8 rods(late 327 and 350) have a housing bore of 2.2247" and are called large journal. Both the 250 and 350 V8 rods are 5.700" in length with the exception of 400 SBC which is 5.565"in length.

Thanks for the info.So if you used the small housing bore rods(I see you can get custom rods for chevys just about any lenght at pretty good prices) how do you get around the diferent B/E width? It would be great if these could work.

CNC-Dude":havaxkfz said:

The B/E for the 250 rods is 1.030"wide, and the SBC rods are .940. The 250 rods have a smaller housing bore of 2.125", the same as the 283 and early 327 V8 rods, and are called small journal, and the later V8 rods(late 327 and 350) have a housing bore of 2.2247" and are called large journal. Both the 250 and 350 V8 rods are 5.700" in length with the exception of 400 SBC which is 5.565"in length.

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Scat makes a 6" rod for the 250 6 cylinder engines. What width rod do you need for the crankshaft you will be running.

Well the only reason Im looking at these rods is that if you saw my other post on Yamaha pistons I have two blocks that are bored out 60thou if i go the Yamaha piston I need a rod about 6.25inch and ive seen some for the Chevy. The pistons are forged and only about $140 each and a set off rods about $500 to $600 and ill be useing another EF crank (standard 250 B/E width).I could go 200 rods I just need to figure out piston deck height.

CNC-Dude":ys598ern said:

Scat makes a 6" rod for the 250 6 cylinder engines. What width rod do you need for the crankshaft you will be running.

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Chev rods are fine, i use 6.2" rods with the yamaha pistons, you have to resize them thou and the small end you resize so you gain compression height and it's all good. The bing end is a bit thinner but that's ok when you resize it you machine new locks for the bearings and you center the rod on the bearing, no harm done at all.
see here http://i1107.photobucket.com/albums/h39 ... y-Side.jpg

What about Ford 300 rods?

sorry i have not had a chance to play with the 300ci yet, do they have a bigger bore or longer stroke?, the 250 has a stupidly long stroke already so if they 300ci has an even bigger stroke then it must be for some sort of tractor or truck ? as it won't rev much

falcon":2jguz2uy said:

sorry i have not had a chance to play with the 300ci yet, do they have a bigger bore or longer stroke?, the 250 has a stupidly long stroke already so if they 300ci has an even bigger stroke then it must be for some sort of tractor or truck ? as it won't rev much

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The Ford 300 "Big Block" inline six has a 4.0 inch bore with 3.980 inch stroke. The rod length is 6.210 inches, the B/E bore is 2.2758 inches, and the width is the same as the 250. The pin end comes in two sizes, the early rod (1965-68) is 0.910, the later (1969-97) is 0.975.

The 240 engine (a destroked 300) has an even longer rod, 6.795 inches.

The 240 was installed in passenger cars and trucks, the 300 just in trucks. The 300 engine is a torque monster and has been known to go over 300K miles before rebuilding.