forged 3.85 crank

Looking to step up the crank this winter but want to stay with stock stroke. Calling Adney in the morning and going to see what he says. Uncle Charlie has my heads and is max porting them, and I am going to a roller cam. Looking at 14:1 pistons but afraid the crank won't handle it. Stock D9 crank and block but going to set up the Dove A block I have. Is there a good forged crank on the market? Don't want to go to a stroker yet.

A factory Cast Crank will live fine, they have plenty of overlap. If your running a stock 2 bolt block, I'd be worried about it before the stock crankshaft.

and no their are no 3.85 off the shelf cranks avaliable, it would be a custom Piece and if your going to buy a new crank and pistons, get the stroker stuff now.

Stop listening to your chevy buddies, These aren't Chevy Cast Cranks.......

I do have the caps for a 4 bolt conversion just didn't want to spend the money yet but if I don't have to buy a crank then the money is available. Thanks.

i was looking for one too. if you find a forged 3.85 crank can you let me know. thanks

I doubt that there is a N/A application where the stock crank won't hold up. Like Freelander said the block will break before the crank does.

Well guys????? The factory 429 big truck forged were 3.590" long stroke with a 2.500" rod journal. So,,,,,if they are offset ground to a 2.200" rod journal,,,,,,shouldn't a guy fall right in there with about a 3.850" + stroke? Adney????

Charlie

514Fox87 wrote:Looking to step up the crank this winter but want to stay with stock stroke. Calling Adney in the morning and going to see what he says. Uncle Charlie has my heads and is max porting them, and I am going to a roller cam. Looking at 14:1 pistons but afraid the crank won't handle it. Stock D9 crank and block but going to set up the Dove A block I have. Is there a good forged crank on the market? Don't want to go to a stroker yet.

You haven't made any statements about your engine build which read as though the factory cast crankshaft won't do; they have proven time and again to hold 4-figure horsepower almost always without issue (I've never heard of one failing on its own). How much power and rpm are you intending?

daves79dart wrote:i was looking for one too. if you find a forged 3.85 crank can you let me know. thanks

If absolutely necessary, it's possible to make a 3.85" stroke crank from a forged 429 crankshaft (it will have 2.200" rod journals) but getting one machined up will cost significantly more than the offshore stroker cranks offered today. We have a few here right now, one is 3.875" stroke, another is 3.85" stroke, etc. The snout and flange will also need machining. These particular modified cranks are not for sale and will be used in engine builds, but we do have more 429 steel truck crankshaft cores and I might consider selling 1 or 2 for the right price. 514Fox if you've already contacted Adney then I suspect he'll tell you that he already has some of these cranks in stock and could make the crankshaft you want.

Paul

The Crankshaft Harold Webster has in his engine is a 429 truck steel crank that Engine systems did a few yrs back. I don't know the exact throw on the crank but Ted Fisher said w/6.7 Rod and the 2.20 journals the cubic inches was 472ci. Nice piece,but like Paul stated,after cutting down the snout and journals and the price of the crank,you could buy a nice stroker crank.

No one makes on, due to insufficient demand. Billet is the only other option.

Last time I checked with Crower I'd have to sell my house to buy a billet crank.

WHY is a Billet crank BETTER than a Forged unit other than being a custom grind?

They aren't

dfree383 wrote:They aren't

Then WHY,do guy's think it's such a big deal that they are running/or have one ForSale?

because they are expensive to have made........ they are only reasonable way to get custom stuff, where a forging is not avaliable.

Also the metal used can make a billet better than a forging, if your compairing a 1053 forging to a 4340 billet..... but with equal metal the forging is better. it has to do with grain structure and ability to take abuse.

bbf-falcon wrote:

dfree383 wrote:They aren't

Then WHY,do guy's think it's such a big deal that they are running/or have one ForSale?

If the forging isn't available, you can make what ever you want out of billet stock, and the time line would be based on the machinist.

While we're on the subject, some billet crankshafts have been known to sustain 6000-8000 hp and live. So why can't a 429 steel truck crank handle a few thousand horsepower for a short period of time? They are nice American forgings formed of 1053 mild steel and have more overlap than the typical Fuel crankshafts.

Case In Point: Van took a 429 steel truck crankshaft and had it stroked to 4.125" stroke with a 2.200" journal. In order to get the stroke out that far and still have the BBC journal diameter, he had to first weld on the outside of the rod journals (ie, build them up) or there wouldn't be enough material to stroke that far. It was sent to Velasco who reground the crankshaft to the 4.125" stroke.

That crankshaft was used in an engine that ended up in a Fuel-Altered which ran a known best of 6.41@219mph in the quarter mile (ca. 1992), and was regularly in the mid 6's. That requires a few thousand horsepower, and the crankshaft never failed.

One of the truck cranks that we have right now for a customer build has more journal overlap and has had a lot more prep work done to it by the crankshaft shop than Van's crank ever did. I think it is capable of sustaining more power than the one that was in his car.

Paul

Not to old to stop learning new things

As usual, Paul is a wealth of information.

There were also the Boss 429 Can Am forgings, though there are not many around and the cost to machine them from a raw forging is prohibitive.

Good info to know Paul.

I have a crank that looks like a forging not a billet. It is a 3.85" stroke with 2.20" rod journals and has a Velasco stamp on it. So I am thinking it is the 429 forged truck crank re-worked by Velasco. I contacted them about 6-8 months ago and they said they don'y really do that kind of thing anymore nor did they keep any records or stamp any numbers on those type jobs. This crank was done in the early 90's for a specific River Jetboat class up here in Alberta that was limited to 470" or so. Now they said they offer only billets.

FWIW Mark

bbf-falcon wrote:

dfree383 wrote:They aren't

Then WHY,do guy's think it's such a big deal that they are running/or have one ForSale?

Because there are "buzz words" that set racers hearts all a-twitter.

Billet is one of them. I liked the old Childs & Albert "Forged from billet bar stock" especially well.