Completed Project Brandon's mild 4.0 OHV build

[Maniak]

Other than the pitting, those are less bad then the ones I ended up putting on 1 side of the X when I screwed up a rocker arm on one delta rocker arm assembly.

Keep in mind,in the scheme of things, those are very easy to change. I can change out both rocker arm assemblies in well under 2 hours.

If your out of money, I'd polish up the ends a little, get the new push rods, build the motor, save some money and change out the rocker arm assemblies then.

~Mark

 

[Brandon96]

Out of curiosity, and the desire to learn...

What causes pitting like this between the pushrods and rockers? Also, putting these rocker arms back in as is with new pushrods, and the new dual valve springs, what will that damage/affect?

 

[Tyson128]

Delta cams might be the move. They did a great job on mine. I was pleasantly surprised.

 

[Brandon96]

If you back up a few pages, you'll understand why I won't be purchasing anything from delta cams...

 

[Scott B.]

Before you regrind them, remember - it has to be done with precision, because the length of the pushrods is determined by the amount you grind off.

Take off too much material, and the valves will not open all the way...

 

[Maniak]

I would "think" the pitting was from oil that was too old or dirty or possibly from a vehicle not run enough to burn off the acids.

I've never build a real performance motor so what I would do may not be right. I'd personally figure out what length pushrods I needed by looking at the legnth needed on a good rocker arm. Then buy all of them that length. Then after the motor is built and I got more moeny I'd buy new rockers to fix the bad ones and call it a day.

~Mark

 

[Xeek]

yea the delta cam guy did the same to me. i asked him the price without pushrods and he said i should buy them cuz they good. then i re-asked for the price and he said hed check when he goes in and to check out the new forum. he never answered about the price either.
i never bothered to call.

im going with rockauto now myself.
dumb question, and im probably gonna say the answer to it; does the rockers i need come individual or a pack of 12?
SEALED POWER Part # R1092 $12.47
im guessing individual cuz $1.04 each is cheap unless shipping is ~$80 lol
would it be wise to get the rocker arm holder(no idea what its called) also? if yes, what is it called so i can find it

 

[jd4242]

Those arent that bad,i would still replace them.do not repeat do not try and grind them!!

 

[jd4242]

yea the delta cam guy did the same to me. i asked him the price without pushrods and he said i should buy them cuz they good. then i re-asked for the price and he said hed check when he goes in and to check out the new forum. he never answered about the price either.
i never bothered to call.

im going with rockauto now myself.
dumb question, and im probably gonna say the answer to it; does the rockers i need come individual or a pack of 12?
SEALED POWER Part # R1092 $12.47
im guessing individual cuz $1.04 each is cheap unless shipping is ~$80 lol
would it be wise to get the rocker arm holder(no idea what its called) also? if yes, what is it called so i can find it

No thats for one.

 

[jd4242]

Also remember what type of rockers you run will determine the length of pushrods.its the lack of oil causes rockers and pushrod wear!!

 

[jd4242]

Out of curiosity, and the desire to learn...

What causes pitting like this between the pushrods and rockers? Also, putting these rocker arms back in as is with new pushrods, and the new dual valve springs, what will that damage/affect?

No just will be noisy and loss of performance,valve wont open all the way

 

[Brandon96]

ahh.. Well I hate to say it, but I think I'm going to go to the Junkyard this morning and pick up some used, but not worn rockers to replace those that are more severely pitted. (I think i'll try to find 4 or one whole rocker assembly that's decent) The Delta Cams and Rock Auto ones are regrinds, therefor would not use same size pushrods as the OEM ones I have..

I'll be headin' out west till friday to go hunting. :/ I should come back to a complete set of heads waiting to go back in the truck!

If I'm not mistaken, as long as I'm using the stock-sized rockers, without pitting in them, the proper pushrod length should be 5.525" Correct? Also, JD, what wires are you using? I ruined one when I was taking apart the motor and was hoping to get some lime green or fluorescent yellow ones :

 

[Tyson128]

Understood on the Delta Cams and pushrods piece:

Here's that link I got on the cam sensor fitment:

http://www.asashop.org/autoinc/may2004/techtips.htm

 

[jd4242]

Rockauto are new not regrinds.i havent measured with stock rockers.but it depends on how much they shave off your heads,type of head gasket.that cam is.50 smaller base circle that i do know.you not having your intake manifold gasket matched and p+p? I run magnecor wires,they are pricey!!!!

 

[Ronin8002]

for heads that haven't been decked and stock type rocker arms, pushrod length is 5.550. If you use the delta cam rockers, use 5.525 since they have the built in pushrod cup, that shortens the length required.

 

[jd4242]

for heads that haven't been decked and stock type rocker arms, pushrod length is 5.550. If you use the delta cam rockers, use 5.525 since they have the built in pushrod cup, that shortens the length required.

Ive heard that before but believe thats wrong.whatever the cup adds they grind of the other side weather it needs it or not.a stock rod is around 4.75 + .50=5.25 so if a stock rockers use 5.50 that whould be adding .75 we all agree that cam is only .50 small base circle so where and how are people getting 5.50. I run 5.15 i think but i have a measuring rod from smith brothers

 

[Brandon96]

ahh i see.. ill have to get them measured regardless.. p.s. im on a treestand right now... nothing is moving and its cold as CRAP!! lol

 

[jtoth]

Great read so far.....do you expect the use of the 410 cam to require a tune?

 

[jtoth]

correction 422 cam

 

[Brandon96]

I'm back from the woods!!

jtoth - to answer your question, yes I expect to use a tune, but I definitely won't get it tuned right away upon completion of the motor. It will be fine, and a slight improvement over stock, on the stock tune. But, in order to get the most out of the cam, just like any other performance bolt on, it'll need to be fine tuned.

One of the heads is done, unfortunately I've been informed that a crack, too severe to be repaired on the other one has been found. Looks like I'll be searching for another head. I plan to go down there Monday to look at and get a further understanding on my options.

While I am pissed about it, I half expected something like this and the guys at Ballos Machine are taking care of me quite well... just another hold up in the grand scheme I suppose...