4g63 eagle rods

[Gm68439]

I have recently got a set of 7 bolt ross pistons on a set of 6 bolt oem rods rods have been
opened up to accept them I didnt know that the pistons were 7 bolt because they were on the 6 bolt rods I know this because I removed them froma six bolt engine. I decoded the number on the pistons and they are for sure 7 bolt. I read that on the eagle rods seven bolts have to use 6 bolt bearings I was wondering if the rods would work on 6 bolt crank or can I have the brass bushing opened up to the right size to utilize these pistons


thanks

 

[Spoolin4Ever]

I have recently got a set of 7 bolt ross pistons on a set of 6 bolt oem rods rods have been
opened up to accept them I didnt know that the pistons were 7 bolt because they were on the 6 bolt rods I know this because I removed them froma six bolt engine. I decoded the number on the pistons and they are for sure 7 bolt. I read that on the eagle rods seven bolts have to use 6 bolt bearings I was wondering if the rods would work on 6 bolt crank or can I have the brass bushing opened up to the right size to utilize these pistons


thanks

You pose your questions in such a way that I am somehwat confused.

Let me see if I can get this straight:

So, you say you have a 6 bolt engine (that you are rebuilding), and you pulled some rods and pistons out of another 6 bolt (a parts motor, so to speak?), and found out that it has 7 bolt ross pistons, on a set of OEM rods.

And you have your own Eagle rods, and you want to put those 7 bolt pistons on your brand new eagle rods, and put this all in your 6 bolt?

And you are curious if the Eagle Rods will work on a six bolt crank, and you also want to whether or not any modification needs to be done to make the rods work with the 7 bolt pistons?

Is this all that you are asking?

Where did you get the Eagle Rods? Are they made to fit the 4g63 6bolt? I would think that if you bought them for that engine, then yes they will work with your crankshaft. I mean, you bought them from a dealer, and told them what engine it was for, or not?

As far as the pistons working; 1G 6bolt rods have to be machined to accept 2g pistons.

Remember, the 1993 and 1994 are also a 7 bolt, but the are the same pistons that are found in 6 bolt engines (7.8:1 compression). 2G pistons (which are also 7 bolts), use an 8.5:1 compression ratio.

So you mean you have 2G pistons or not?


1G 6bolt rods have to be machined to accept 2g pistons. if you search 2g pistons in a 6 bolt, there is an image that shows the specs for the rods to accept the 2g pistons. I've seen it but I don't recall the specs. And yes, alot of people here do it.

It's one of the most popular engine building paths here.

 

[95blackGsTurbo]

When you put 1g rods with 2g pistons the rods have to be narrow. No machine work should have been done to the pistons at all. As far as using 6 bolt rod bearings, you use the 7 bolt rod bearings. There is no difference in 6 and 7 bolt cranks besides the number of holes that mount the flywheel.

 

[razorawd]

just to make it simple you have to use 6 bolt bearings on both 7 bolt rods and 6bolt rods but from what I read you are wanting to put 7 bolt pistons on 6 bolt eagles and you can't do cause the size of the pin is different between the 7 bolt 22mm pin and the 6 bolt 21mm pin

 

[95blackGsTurbo]

just to make it simple you have to use 6 bolt bearings on both 7 bolt rods and 6bolt rods but from what I read you are wanting to put 7 bolt pistons on 6 bolt eagles and you can't do cause the size of the pin is different between the 7 bolt 22mm pin and the 6 bolt 21mm pin

You can do it they just have to be bored out 1mm. Also have to be narrowed a little bit. Very common practice on 1g motors looking for more compression.