383 crank drilled for pilot pushing

[MoparMotel]

Would the stock crank out of my original 1968 383 magnum engine be drilled for a 833 4 speed pilot bushing?
Read some information that stated steel cranks would be drilled but cast wouldn't? If not drilled does the engine in my car need to be pulled or can it be done in the car?

Is a '68 383 magnum H code cast or steel crank ?

Thank you.

[birdsandbees]

If it's not drilled for the pilot bushing you can cut 1/2" or so off the input shaft and use a bearing in the crank flange.

https://nationalmoparts.com/index.php?page=shop.product_details&flypage=flexible_flypageV1_WIDE.tpl&product_id=5790&category_id=4950&option=com_virtuemart&Itemid=53&vmcchk=1&Itemid=53&redirected=1&Itemid=53

[A383Wing]

if the crank in question is originally from an auto trans car, it won't be drilled wide enough or deep enough to accept the stock pilot bushing for a manual trans.

[c00nhunterjoe]

Either way, i would run the bearing over the bushing.

[MoparMotel]

Thank you, I will go that route. My plan is to run the 833 behind my original 383 for a year or so while building a 426 Hemi to go in the car. It is my understanding that when putting the 426 Hemi in I will have to swap the input shaft from a 23 spline to an 18 spline.

[1974dodgecharger]

what everyone saids that steel crank is good stuff, but you will need to cut I think an inch and quarter off the input shaft so you don't ruin that engine. 

You can use a 18 spline behind that 383...either way your gonna need a new flywheel, new clutch, for that HEMI.  One is a 6 bolt and other is 8 bolt.....

[c00nhunterjoe]

The 23 spline units are strong. Good enough for high 11s in my opinion. Traction is what breaks them. If your hemi will only have bfg radial ta tires on it, then dont sweat it. If it will have stickies on it, that 23 spline input shaft is alot stronger then your axle shafts.... just sayin. Lol

[MoparMotel]

The 23 spline units are strong. Good enough for high 11s in my opinion. Traction is what breaks them. If your hemi will only have bfg radial ta tires on it, then dont sweat it. If it will have stickies on it, that 23 spline input shaft is alot stronger then your axle shafts.... just sayin. Lol

I appreciate the info guys. The Hemi I found is date coded 10/31/66 and will be the stock 425hp build with the same 15x8 magnum 500's with BFG TA's that are on it now. I am going for a stock appearing R/T 426 Hemi 4 Speed clone but will take me at least a year or so to get the 426 Hemi built and find all necessary parts for the swap. Would like to have the 4 speed conversion done and run it behind the 383 while waiting for the Hemi.

[Troy]

You can't just "swap the input shaft" as far as I know. There's more to it than just the number of splines. You aren't required to have an 18 spline behind a Hemi - but the factory put them in there for a reason (probably warranty). But even then, it was different than the 440 version and specific to the Hemi (bigger flywheel, more teeth at least, different bell housing, different starter, etc.). If that's your final goal then buy an 18 spline transmission now and put it behind the 383. The clutch plate and throwout bearing are specific to the input shaft so why buy twice? A 4-speed AND Hemi swap is an expensive undertaking (likely equal to the cost of the car). If you want it to look stock the parts get a lot more expensive than off the shelf or "crate" parts. Starting with a factory Hemi will help in that respect.

Troy

[John_Kunkel]

A '68 has a forged crank that will be pilot drilled but probably not finish reamed to its final size unless it was a standard shift car. The pilot drill size is still larger than the trans input shaft so the crank register mounted bearing/bushing can be used without shortening the input shaft.

[chargerbr549]

Here's an earlier link with some more info on the same subject

http://www.dodgecharger.com/forum/index.php?topic=65655.0

[MoparMotel]

Thanks charger549, just read thru that. I'm considering just waiting to do the 4 speed at the same time as Hemi since the car will be apart anyways.