[PONTIAC DUDE]

A 4" stroke with a 6.8 rod gives you a great rpm rod ratio and still have cu.in with a 4.350 bore.
I like that relationship in the 1.67/1.72 range. I feel rod ratios are often overlooked, wrong thinking or misused. Both higher and lower depending on application.
A great N/A or power adder/blower/turbo combo.

Build a few 454 .100 over with a stock stroke 454 crank that fly. That was a common BBC combo for many many years till the Merlin 4.500 blocks hit the market. Still buzz it 8000/8500 rpm all season long.
A lot of factors to consider with new products and you will never satisfy everyone.
I think they are marketing a crank in the right area. More percentage of 4" to 4.5" cranks to be sold and see a return on an investment. Like the current aftermarket cast cranks. By 90% I would think.
I see the 4.5 crank to be a big seller.
4.350 bore X 4.500 sroke = 535 cu.in. of Pure Pontiac Power.
I run it, I like it, and will last forever. Sorta the aftermarket 455 with a 4.250 crank most are running now.

Curious; Not tryng to stir sh*t, but Why go lower in stroke to a 3.75 with a Pontiac ???? Class rules ????

[02Hawk]

Woo Hoo, all right

[68post]

Can you also machine these forgings for an Oldsmobile ? We can use the 4.25" and 4.50" strokes easily. (a 4.5" stroke and a 7.3" rod )

[Robert C.]

Originally Posted by 68post

Can you also machine these forgings for an Oldsmobile ? We can use the 4.25" and 4.50" strokes easily. (a 4.5" stroke and a 7.3" rod )

Call me on this.


804-349-0014 cell

[Half-Inch Stud]

"a 4340 non-twist forging" -wow, non-twist, somebody likes this project.

Since crank fractures happen at the journal radiussess BEFORE ever happening at the oil-drillholes, I ask aboout Radiusing: Traditional old PMD radius cut, or the new-ffangled undercut technique?

Also, what is the optimized Main Bearing set for the new crank: upper half-groove, 3/4groove, full-groove?, no groove=grooved crank, funky groovey. HIS

[68post]

Will do Bob ! Thanks !

[Brian Baker]

GJN, you are definately the exeption to the rule.

[02Hawk]

I will also pick one up when I do the next rebuild. Everything else is the best money can buy including the chinese crank that is in there now(no other choice last year). The second one BTW.Billet cranks last year were about 4500 Canadian and a years wait. I for one am glad that we were getting the chinese cranks as the chevy option was the only one left up here.

[tom s]

Wade said low teens so that in my mind means $1300 will be the cheapest price.That is about 4 times the amount for a cast crank.In a street car,might not make sense.Tom

[Tom McQueen]

$1300 isnt bad for a crank you can seriously lean on and sleep at night. The new Moldex billet I just got was double that. Given the choice, I would go for a forged crank if it was a proven piece and was available with the specs I wanted. Plus, the forgings will probably have a much shorter wait time once they are available.

[Tom Vaught]

You will not find too many forged cranks with lightning holes in the pins, double key-ways, full counter-weighting, a moldex oil system, and the other time intensive operations with great steel for $1300.00 either. LOL! Enjoy your crank Tom!

Tom V.

[Brian Baker]

I was told the projected retail will be $1050...we'll see.

[Engo]

Wade Congdon.

When can we expect these crankshafts to be delivered?
I will order at least two but I need to know for sure when I can have them.

[JSAauto]

3.75 stroke with a big bore for Turbo engines would be a great combo.

Are these cranks going to be made in China or in the USA??

[quick67bird]

From what I have read they are forged in China, but finished over here.

Robert

[455-4+1]

So does anyone know ?? Would an aftermarket forged 3.75" stroke be legal in stock/super Stock or are these limited to factory parts ??

Is the RAV 3.75" crank a 3" main deal ???. If theres limited demand for them I supose they will be cheap ??? LOL Anyone have one for sale or any idea on price ??????

[tom s]

V cranks and also 61 SD 389 cranks are 3in mains.They are legal in SS I believe.The last one I saw on ebay went for $1500.Tom

[lugnutt]

How will these cranks compare to the Moldex? As far as stregnth goes. Are they going to be just as good?

[Dragncar]

OK,they are going to be forged in China.I can live with that(sorry old one).But where and who is going to finnish them.Are they going to have all of the issues as the cast ones,barely within specs,thrust bearing problems ect.If we have to spend a bunch of money on them to make them work they had better come in at 1050$.Mongo,I for one will have no problem buying one for 1050$ and making 600HP.If they are the real deal I will buy 2 at that price.Planing on another engine now,only an aftermarket block pump gas vertion now.But with the small ccs on the Tiger and the High Ports I am trying to figure out which stroke to go with.Maybe a 4.00 and build a big bore short stroke high rever.The dish in the pistons can only get so big and work right.

[rumair]

a forged crank done right for under $1500?

i'd be all over a couple of those...