Just have a quick question for those running Eps cams who have been specs by patrick .. do u guys use the recommended pushrod lenght that patrick recommends? I have 7.350 on cam in sig I was recommended 7.425 with new cam so I bought some I just feel like thy might b on the big side. Wondering if those who have had these cams specd ny patrick usually follow the required length with no problems?..

Engine is a L33. 5.3 which came with flat top pistons and 799 heads which were milled to 59.5cc (30thousands milled) .. stock head gaskets..

 

Based off head mill and cam base circle. Stop being ******* lazy and get a pushrods checker

 

I have one!.. just wana know if patrick specs the rt pushrods gosh just a question! Ur soo mean! :-( lol

 

Then post more specs of your setup. People cant hold your hand if you dont say how much you milled your heads. Eps cams and stock heads use 7.4 soooo with your mill heads subract that and you have your pushrods....do you need a calculator?

 

Well I heard Eps cams have a smaller base circle then all other cams..

 

I will agree. Use the pushrod checker and go from there. I would not trust a length that someone on the other end of the phone says per your "specs".

if you dont want to trust reading a pushrod checker and have your old gaskets and head bolts than check piston to valve clearance with some putty. Our shop does both methods to verify the pushrods were measured correctly.

 

I am gonna use the pushrod checker im also gonna measure the difference in base circle from both cams and divide that by 2 and add it to my current pushrods to c what i come up with.. only reason I ask is because I want to c how acccurate patrick g is with his recommended lwnghts..

 

EPS cams are on a smaller base circle. That's why they use a longer pushrod. 7.425 with stock heads.

 

Pushrod length is not rocket science, it is very simple, and should be done on every engine.

Pushrod length will not have an effect on a clay imprint unless your pushrod is so long that it is keeping your valve opened on the closed part of the lobe, or unless it is so short that there is no preload, and that would be extremely loose.

There are two types of rockers, an adjustable rocker and a fixed rocker. The stock are the fixed style that are torqued to spec, and it is usually 22-ft lbs. To determine your pushrod length, you need to turn the rocker bolt by hand until the lash has just met zero. Do not go past, you can easily compress the plunges spring in the lifter when turning the rocker bolt by finger. Count the turns it takes to achieve the desired torque. Now here is the only bit of confusion. Use your manufacturers specs here. GM has them from the factory at about 1 1/2 turns (i never checked what mine was from the factory, and I am going by what everyone has said), and comp told me to turn mine 1/2 turn. I listened to comp, and set mine at 1/2 turn preload. If you want to shoot for 1 1/2, most people are happy with anywhere from 1 1/4-1 3/4. So if it takes you 2 turns to achieve 22-ft lbs., they are too long, or if it takes 1 turn they would be too short. You really don't need a pushrod length checker, but most people use one as it is a little more accurate. I used one too, but you don't need it.

 

Just for the record, most aftermarket cams are on a smaller base circle. It's the only way you can get higher lift lobes when you have the constraint of cam bearing size....

Nothing special about these EPS cams in that sense.