454 or something else?? 496??

[6600DURAMAX]

Posted this in the general section but thought it might be better here since all of you deal with this stuff daily.

Bought the truck over a year ago and was told it was a 468 (bored 454) the current owner didnt know much more that that.
Found out by pulling the vavle covers early on that it has a set of Mid-Lift Roller Rockers along with a roller cam and lifter....... was pretty excited about that. Obviously could pull the pan without pulling the motor and everything was in to good of shape to do that................unitl now

Well below are some pics of what I found today.

MY QUESTIONS ARE AS FOLLOWS:

1. Is this a 454 or is it a 496 (probably dreaming or wishful thinking but follow me on this)

2.. I know they are H beam rods but I cannot find any part numbers to determine the length, from the center pin to the center of the cap they measure around 6 3/8'' (kind of hard to get an exact measurement) Why isn't there a part number? Is there a correct way to measure the length while in the block??

3. Crank?? Obviously an aftermarket but again can find no part numbers. Is it a 4'' stroke or a 4.25 stoke? How in the world can I tell without pulling the heads? Look how close the crankshaft is to the block? Can I tell if the crank is cast or forged by looking at the flywheel end?

4. The flywheel did not have a weight on it??? Should have for an externally balbnced 454. Maybe it is a forged crank that is internally balanced (probably wishful thinking again.


Help me out here guys this is driving me crazy.

Oh ya Bad news of today was the MSD distributor gear has 4 or 5 teeth that have worn to a knife like point What causes this?

MSD looks like it is corroded beyond belief, dont know how it even ran? What causes this?

And the las tbit of bad news/good news is the oil pump pickup was broke of and bairly hanging on?

I know this is long post but any help would be appriciated

[Wild83C10]

CAn't halp you with the engine questions as I'm not familiar with BB. But you need to make sure you have a cam button with the roller cam and you also need a composite distributor gear.

[djracer]

It looks pretty good. You would need a dial indicator to measure the stroke and a dial bore gauge to measure the bore.

[6600DURAMAX]

Well did some more investigating last night and was able to find some numbers on the front of the crank. They are DG3-454D............ When I put these into Google search I come up with a 4340 Forged Crankshaft with a 4.5'' stroke I am still not 100% sure because it looks like on there website they show there name above the number and, although very hard to see up in there, I do not see RPM anywhere on the crank. Could be something they just started doing recently also????? I will call them today and get there input.

RODS??? - They have numbers on the bottom of them but I cannaot get them to cross reference against anything. Each rod has a unique number.
8913S, 9023S, 8664S............ Any idea guys

Looks like it could be a 500+ cu in motor, which would mean the 427 heads taht are curently on there are the reason it doesnt act like it...... Or it could be that nasty distributor

[Malibu 496]

Is the block clearenced? I cant tell by the pictures if it is.
When I built my 496 I had to clearence the bottom ofeach cyl for the additional stroke. Also I thought 4.25 stroke was the biggest stroke you could put in a stock block but I could be wrong.

[6600DURAMAX]

Mailbu, you could be correct, I am not sure what it would look like if it was clearenced though??? Dont have a standard block to compare to.

Talked to the guys at RPM yesterday and they say it is their crank sold under a different vendor since it did not have the RPM logo. GREAT Right???? WELL last night I just couldn't leave it alone that it still probably was to good to be true. So I attempeted to measure the stroke for myself without pulling the head. I did this by measuring how far the bottom of the piston shirt moved in the cylinder. I think this should give me the stroke CORRECT??? Well I came up with 4'' WTF ??? Looks like I just have a high dollar forged stock stroke cranks So I guess there are cranks out there with the same number as the RPM cranks that are NOT 4.5'' stroke?

I am really bummed but shouldn't have expected more than that I guess?

someone let me know if they think the way I measured was incorrect, maybe that will shine some light onto this day.

[Alex1]

I don't think you can get a 4.5" crank in a factory 9.8" deck BBC.

I would pull a cap or two to make sure the bearings are good and put a new distributor gear on - or swap to another distributor completly. Also not all roller cams (solid or hydraulic) require a bronze or compsosite gear but you will have to figure out which one you need.

Someone also mentioned you need a cam button - yes you do because you have to limmit the cam movement so make sure you have that as well - also check the cam gear - it's probably damaged as well.

[Ironclad454]

Unless it's a 10.2" tall deck 427 block that someone pulled out of a medium duty and rebuilt. He did say it had 427 heads on it. Just an Idea.

[6600DURAMAX]

It does have a cam button. I believe it is just a standard height 454 block that someone put a stock stroke forged crank in. I am now trying to convince the better half that I NEED aluminum heads !!! If someone out there has a cheap set laying around let me know. hahaha

[djracer]

Look at the patriot performance heads they are pretty cheap!