When you don't trust your local engine shops..

[Racing68]

If i owned a hemi the last thing i would want in that engine is a stock rod. With the combo of bad forgings, machining, and weight differences of over 50 grams in a single set, anything aftermarket is light-years ahead in quality.

[427dart]

He still has the original rods plus two other sets of new rods. He might be changing his mind and looking at a new larger cube short block or another complete engine and keeping the original stored.
We will see as he just retired and has some money to play with.

[zums]

This is my Mickey Mouse drawing of the issue I was trying to describe earlier. not sure if it'll even attach. The parting line angle is greatly exaggerated to show how grinding the rods perpendicular to the sides of the rod and cap will cause misalignment.





rod drawing.pdf

Im not a crysler guy , but this is intriguing, why would they do that?
Tom

[MotionMachine]

This is my Mickey Mouse drawing of the issue I was trying to describe earlier. not sure if it'll even attach. The parting line angle is greatly exaggerated to show how grinding the rods perpendicular to the sides of the rod and cap will cause misalignment.





rod drawing.pdf

Im not a crysler guy , but this is intriguing, why would they do that?
Tom

I'm sure it's not on purpose. It's not a problem until the rod needs to be reconn'd.

[n2xlr8n]

OP: I can relate to his anxiety, but I too think he's going overboard.

My previous two engines- One "circle track specialist" machine shop bumped a BBC crank over onto my brand new aftermarket cylinder heads, cracking the valve cover rail (and denied it). I had to buy another.
The other (recently) bored a 2.3 Lima block .030...when I asked for .020.

Tell him to find a competent machinist and stick with him- they are out there.

Dan Dutton Machine in Alexandria, AL
Tom @ Competition Engines in Bessemer, AL.

[cgarb]

[/quote]

Im not a crysler guy , but this is intriguing, why would they do that?
Tom
[/quote]

Because it's a Chrysler...why else.

[Dan Timberlake]

Agreed, it was most likely a mistake, or possibly compensating for some error somewhere else, since it seemed to happen more than once, and to just a couple of manufacturers. Although, the severity of the angle was surprising.

After finding the first one or to rods, we figured out how to put a shim between the upper edge of the cap/rod and the fixed jaw of the Sunnen cap grinder until it was cutting parallel to the OEM rod machined surface,

==============.===========

This is my Mickey Mouse drawing of the issue I was trying to describe earlier. not sure if it'll even attach. The parting line angle is greatly exaggerated to show how grinding the rods perpendicular to the sides of the rod and cap will cause misalignment.





rod drawing.pdf

Im not a crysler guy , but this is intriguing, why would they do that?
Tom

I'm sure it's not on purpose. It's not a problem until the rod needs to be reconn'd.

[pdq67]

Think about a brand new rebuilt engine that on fire-up, you find out that it swallowed a small nut down the carb!!

Can you say, "sabotage"??

I was going to have my good -781 BBC heads done and when I talked to the guy running the shop, he said that, "It was going to take a long time and cost a lot of money!..

So I bought a pair of new cast-iron Merlin ovals from Summit instead!

pdq67

[philb]

Google antique auto ranch a poor man's balancer

[Krooser]

This is my Mickey Mouse drawing of the issue I was trying to describe earlier. not sure if it'll even attach. The parting line angle is greatly exaggerated to show how grinding the rods perpendicular to the sides of the rod and cap will cause misalignment.





rod drawing.pdf

Im not a crysler guy , but this is intriguing, why would they do that?
Tom

Worn out tooling? Seen a few SBC cam tunnels bored at an angle... mass production.

[cgarb]

*Sarcasm here*....lol.
The angled parting surface was no mistake, the superior chrysler engineering designed that into the holy grail Hemi engine so that when you torque the rods it increases the side bite on the rod bolts to survive the 9000 rpm blasts. On a serious note it has to be pretty decent old stuff to keep those heavy components inside the block at high rpm.