really long rod stroker 427

[TomP]

It is stroked, 3.84. Not max at all, it just needed that to match the pistons and available rod lengths. As it is the rods will need to be narrowed and get smaller pin bushings. I wonder if Scat or whoever would make them that way if asked or if they just come already done an inch wide with a .990 pin hole from China?

[plovett]

I like it!  It's different.  I want to see what those short pistons will look like.

pl

[gt350hr]

  TomP,
     You may want to reconsider the 7.100 rod length. The 1.140 compression height gets the top of the rod close to the underside of the piston especially if it needs a dish. The pin will be in the oil ring groove which is NO problem. The rod to stroke is 1.84 which could push peak torque up a few hundred rpm over a 6.8 long rod with a 1.77 rod ratio and 1.440 C/H. Your choice , I'll be interested in the outcome either way.

[My427stang]

It is stroked, 3.84. Not max at all, it just needed that to match the pistons and available rod lengths. As it is the rods will need to be narrowed and get smaller pin bushings. I wonder if Scat or whoever would make them that way if asked or if they just come already done an inch wide with a .990 pin hole from China?

I hope this will work, but be sure you get a set of narrowed bearings first and look, Clevite CB743H is one part number, and see how much you can take off the back side without getting into the bearing, maybe you can avoid the bevel side.  You'll need to cut .117-.119, you can of course cut either side, or the bearing too, but it gets more difficult the more adaptation it required, and that's a long way

[Joe-JDC]

Narrowing bearings is not a real problem if you know how.  Put the bearings in the rod, tighten the bolts snug, and take a carpet knife with new blade and drag it at a 90* the entire circumference of the bevel on either side.  Did it with 302 stroker rods and it works like a champ.  Goes against your thinking, but it works.  Practice on your old bearings.  Joe-JDC

[blykins]

Narrowing bearings is not a real problem if you know how.  Put the bearings in the rod, tighten the bolts snug, and take a carpet knife with new blade and drag it at a 90* the entire circumference of the bevel on either side.  Did it with 302 stroker rods and it works like a champ.  Goes against your thinking, but it works.  Practice on your old bearings.  Joe-JDC

When you gotta take a lot off, you can also clamp them to a mandrel that you can chuck up in a lathe, then take a tool and cut them down.  You gotta narrow a BBC bearing a whole lot to fit on an FE width journal. 

[frnkeore]

This is how I do it. This is SBC to SBF.

This just to narrow for 229 Chev bearing. To do the bearings and rod, you just make the spud shorter and chamfer after narrowing.

[My427stang]

Narrowing bearings is not a real problem if you know how.  Put the bearings in the rod, tighten the bolts snug, and take a carpet knife with new blade and drag it at a 90* the entire circumference of the bevel on either side.  Did it with 302 stroker rods and it works like a champ.  Goes against your thinking, but it works.  Practice on your old bearings.  Joe-JDC

I have used a bearing knife, but just to be clear, this is almost 1/8 of an inch difference from a BBC to an FE.  If all done on the inside edge of the rod, the bearing will need to be narrowed with the rod because they almost go to the edge, if done on the chamfer side, a narrow bearing usually has some room before the edge of the chamfer, but it likely depends on how much chamfer is needed for the crank fillet and what the the distance from bearing to the new chamfer is after machining. It's likely undoable with a standard with bearing because it would be hanging into the chamfer with a narrowed rod

Small amount can be cut back, but id the shell hits, the shell hits, my only real point is, it's going to take a little thinking that's all

[TomP]

Guys at Scat say they only offer the off the shelf rods and not narrower or with alternate pin sizes so that will have to be done locally.   I'm pretty sure the pistons were made to clear the rods. I bought them years ago. I think they are meant for an MT half inch stroker crank and 392 Hemi rods which are 6.95" long.

[Blueoval77]

That picture of the arm breaker 6000 , I mean Lathe is a little frightening . 

[frnkeore]

Tom, I had a conversation about this, about 2 years ago regarding narrowing BBC rods to FE width. Here's the info about that:

Chevs have a .983 wide big end with a .067 offset, Fords have 0. The big ends can be machined to .873, with ~0 offset. Bearing width is .893, I think and the bearings can be machined in the rods and the outside surface chamfered at the same time as the rod, to what ever filet the crank journal has. If you have a lathe large enough to swing the rod, you can do that in 2-3 hours.

You would take the short side of the bearing (inside surface) down to .005/.010 clearance to the bearings edge, on all 8, then turn the rod around and face it to .873. Then chamfer the bearing, after that.

It's not to hard but, you need to know what your doing with the lathe. I can walk you through it, step by step, if you want to do it yourself or give these instructions to a machine shop, with the above picture and they shouldn't have any trouble doing it for you.

[TomP]

I don't have a lathe or milling machine... though i think i need both... so i'll be at the mercy of whatever machine shop. Sure would be nice if the rods were available that way.

[frnkeore]

I agree but, there are no bearings, that I'm aware of, that are 2.2 and will fit a 7/8 wide rod.

There is no demand but, I think a better way to go, is 2.250 journal rods. Lots of 7/8 bearings available for them.

[TomP]

Yeah but then finding rods for that would become the issue. The crank is already done, though i could save that for something else. The main point of the exercise is to use up these new 1.14" height JE pistons.  Using stock 392 Hemi rods would work, they are 6.95" long but the issue there is a rod journal too big to go on any available aftermarket FE cranks.

[My427stang]

CB743H are .835 wide, only leaves you .035 for the chamfer, but could be workable


Edited for typo