[t money]

Hope this can help some. On the site of RPM Crankshaft they have monthly sales on diffance parts. But this month are forged Pontiac 4.5 stroke forged crankshaft in both 3” & 3.25”and last time I got a part from them no tax and free shipping

[Lee]

A link could be helpful. I found a website for them, but saw no specials.

[t money]

Lee I’m sorry I’m a computer dumbie I can’t link. But go back to the site click on company (in blue) it will take you to the front page. At the bottom of that page you will see 6 or 7 pictures of crankshafts saying April promotions. Click on the the blue link saying forged cranks. It will open the catalog page look at the 30% off $500 red highlighted cranks. When you find it. Can you link it to help others. Thx

[PontiacMatt72]

http://www.racingpartsmaximum.com/index.html
Bottom of page

Looks like two Pontiac Crank part numbers, but it appears to me both are 3.25” main journals, 4.5” stroke. Maybe different rod journal sizes? Not much information, just a pic, part number and price.

Both parts listed at $500. Probably a decent deal if you need that crank?

[Lee]

Ok, thanks Matt! I clicked on the links. Looks like the "A" crank is 3.00" mains and the "B" is 3.25".

[PAUL K]

Originally Posted by t money

Lee I’m sorry I’m a computer dumbie I can’t link. But go back to the site click on company (in blue) it will take you to the front page. At the bottom of that page you will see 6 or 7 pictures of crankshafts saying April promotions. Click on the the blue link saying forged cranks. It will open the catalog page look at the 30% off $500 red highlighted cranks. When you find it. Can you link it to help others. Thx

I'm with you on the computer illiteracy.... but thanks for the info. Definitely a good deal.

[Dragncar]

What is the most power anyone has ever pushed through one of these cranks ? I noticed they did not have any 4.25 small journal cranks.

[mrennie]

They used to carry the small journal 4.25" stroke but must be out of stock. I bought one a few years ago when they were on sale for $479 IIRC.

[BruceWilkie]

They have a 4.21 stroke 3" main Pontiac rod journal(2.25") ( it could be offset ground to BBC journal and 4.25 stroke if you wanted)
They also have 4" and 4.375" stroke 3" main BBC journal as well as the $500 on sale 4.5" stroke.
http://www.racingpartsmaximum.com/fo...sae4340-4.html

[Formulas]

Typically does the RPM Pontiac forgings have the smaller holes in the crank pins?

[BruceWilkie]

Wasn't this PPR's source?

[Dragncar]

Yes, as far as I know they were.

[Formulas]

Nobody can comment on the crank pin holes ?
By the way with new trade tariffs flying around chinese products may become more expensive or flat out discontinued there could be alot of changes or none point being ya might get while the gettin is good

[77 TRASHCAN]

Originally Posted by Formulas

Typically does the RPM Pontiac forgings have the smaller holes in the crank pins?

Their website says, yes on all rod throws, all cranks

[Dragncar]

Forgive me, just terminology. "Crank pins" exactly what holes are you referring to ? How many holes are there on a crank ? Oil holes, balancing holes, threaded balancer bolt hole, flywheel bolt holes and hole for input shaft bearing/bushing.
Which ones are crank pins ?

[Tom Vaught]

Looking from the front of the crank (or the rear) typically there is a bored hole in the rod journal/crank throw that removes weight from the crank mass in that area. The "hole" is apparent in the first throw of the crank in the picture. The rod journal is also called the "crank pin"

Tom V

[Formulas]

Tom has it, some to me just look to large near 1 inch or more and some look to be just around 1/2 inch, the larger ones in my opinion inhearently weaken the crank, rather have more meat.

And Tom showed a pic of a Ford crank Pontiac cranks typically have that hole almost clear through

Pontiac had variences as well some were solid some had holes in the crank pins

[Tom Vaught]

There are enough really GOOD Rod and Piston offerings out there that having a "large crank pin hole" is not really necessary.
Strength is King and the good rods and pistons are strong and light. Thank you for pointing out the Ford Crank, it was just a good example of the bored hole.

Tom V.

[blueghoast]

Most seem to be nitride too. I like that;

GT.

[455firebird1969]

Here is a picture of two crankshafts, side by side for comparison of the size of the pin hole.