I might be able to get a 429 engine out of a school bus but before i decide if im getting it or not, can you tell if it has forged steel crank without tacking it apart? is there a engine code that i could go by?

Thanks

 

If it is indeed a 429 and not a 370 it will be a forged crank. I think there was a post awhile back that had pic's of a forged crank that showed how to tell the difference. You will have to at least pull the pan to find out what it is. They do require some machine work to use them in other applications than a truck engine.

 

I can not get medium duty truck or bus engine to post in my last sentence!

Has anyone else been having words missing from a post, then you go back to edit and they are there but they won't show up in the post?

 

Im looking at building an engine for a Pro stock pulling truck our rules are 480 cubic inch limit factory cast iron heads and a 850 cfm max. carb
And i haven't found a Forged steel crank in stock stroke and i know poeple have machined the snout down on these cranks and then offset ground them for a application like this.

I asked the guy and he told me it was a 429 and not a 370 but somewere i heard that not all of the 429 truck engines had steel cranks so i wasn't sure on that one.

What would be a good price if it had the steel crank?

Thanks.

P.S. I haven't had any words missing on my posts that i now of

 

That's what I have in my pulling motor. I got one that had a spun rod bearing and had it offset ground and finished with a 2.200 rod journal to use a long rod. It's hard to say on the price,I've seen some on the net for $500 without any of the machine work. They are also expensive to balance. Mine took three pieces of mallory at $75 each plus the cost of balancing.

 

So how long of a stroke do you end up with when offset grind it?

 

I read a post on the 460.com forum that you can offset grind them to a 3.85 stroke with a 2.200 rod journal. Mine was gound to a 3.77 to fit my block and rod and piston combo.

 

Thanks for the info ill see what i can come up with

 

Jon I think you are talking about Terry's motor and he offset ground a cast 429 crank to 3.85 stroke it wasn't even a steel crank. You would be amazed at what those cast cranks will take so I wouldn't give up on a 460 stock crank it's a stout piece.
As to the 370 vs 429, one thing to look at is the block casting number, if it has the D9TE-BB casting number it should be a 370, the 429 should have the D9TE-AB casting number on it. Thats not 100% as we found out earlier but it's probably 99% anyway.

 

I think the only difference in the 429 truck crank and the stock crank is the snout dia. and of course one is steel and the other is cast.

 

The pilot bearing diameter is larger than cast crank. If your using an auto there is machine work to be done on that end also.

 

hello tomas you are building a truck for red river?
honestly with those rules i wouldnt worry about a stock cast crank
the truck underpressuer i think you have seen him pull in north dakota right?
well he uses a stock crank that is just a idea on what a crank can handal i have seen the motor hit well over 8000 rpms i ran a stock crank for over 3yrs with those same rules in heartland pullers and never had a issue with one but if you just want to get a steel crank check into a scatt or? sometimes buy the time you buy a stock steel one and get it turned and the balincing done you might not save any cash just a thought

 

Yes this would be for the Red river valley pullers, and what im thinking of doing is just getting a stock crank, good pistons and connecting rods and then have that balanced. But i don't think that i will have every thing ready for this coming season.

 

Can I hijack your 16 year old thread?
And ask about a 70 car 429 crankshaft
From what I read above a 70 T-Bird 429 crankshaft is cast?
Is it internal balance? Worked on those old piles at the dealer but do not know all the particulars
If you were to twin turbo a 70 429 what all would you do?
Pistons? Forged stroker kit? Heads? advice please

 

All 429 and 460 car engine cranks are cast except for special cases like the Boss 429. This isn't any problem and they hold up well. All 429 car engines and 460 engines up to '79 are internally balanced. About the only change that happens is to the size of the pilot hole in the back of the crank and that changes sometime in the early 1970's. Getting your compression to be low enough might be the most difficult thing with a 429 build.

There are some differences in the rods, which are better than they look; with some having straight cut bolt seats and some having spot faced. This is a moot point since the stock rods seldom break in that area irregardless of the machining differences. If they fail it is usually in the beam about 1 inch above the big end. There are some later rods that came in truck applications which are heavier. The balance pad at the end is on the side of the small end on the regular rods and on the top on the heavier version.