Adjustable rockers

[Snake]

cudavert,So would it be safe to say if I get thoes 273 rockers and the pushrods that I should be able to adjust the right preload and be rid of my tick.My 318 did not have a tick untill I installed that comp cam.

 

[cudavert]

Well, sure.....like I said, I'm running an Isky 280 Mega and have no problems or ticking etc. I bought some chrome-moly pushrods from P.A.W. years ago....they sell the correct length set to use 273-style adjustable rockers and hydraulic lifters.

 

[Snake]

Well I think I will go ahead after checking out one more source on Monday,hope I dont snooz and loose again.The seller on here says that the push rods are new and summit ones.Thanks all for the help.

 

[moper]

I am in the process of building a LA 360 so I am curious, why is an adjustable rocker setup required to achieve proper preload? Why not not order pushrods of the correct length to achieve the necessary preload?

Some lifter types need a certain preload and a one size pushrod cant cut it. You can measure every lifter's preload but some anti-pump-up lifters only use .010 preload and the inaccuracies here and there make it hard and you may need 3-4 different lengths to get them right.

 

[Nick M.]

dont mean to hijack... I had intended to use my stock shaft mount stamped rocker setup with a comp cams ex268 or 274 or similar grind, is there a lifter with a greater range of allowable preload to help compensate for manufacturing tolerances? I was under the impression that the factory setup was adequate for mild performance builds. There must be others using stock setups what is the secret to making it work? or are my camshaft choices simply too large for the stock stuff to handle?

 

[66fs]

Since the base circle of the Comp Cams Cam is too small, then what pushrods do you use? It seems to me then, ALL your valve train geometry is wrong. I'm thinking it would be cheaper to throw that cam away and get one from a company that knows how to grind a Chrysler Cam. If you want to use the 273 mechanical rocker system, they are great but use 340 T/A pushrods with a Hydraulic cam, but it shouldn't be necessary with a good cam.

 

[godfatherofchry]

can,t you just shim your stock rocker shafts??. i have run bigger cams than that with out adjustable rockers.

 

[66fs]

can,t you just shim your stock rocker shafts??. i have run bigger cams than that with out adjustable rockers.

Shimming works if you've milled your heads, block, or just want to get less preload on hydraulic lifters for higher rpm. You are moving your rocker arms away from the lifters.

He has the opposite problem. Since Comp Cams made the base circle too small, he needs to move his rocker arms closer to the lifters to get more preload.

 

[godfatherofchry]

Shimming works if you've milled your heads, block, or just want to get less preload on hydraulic lifters for higher rpm. You are moving your rocker arms away from the lifters.

He has the opposite problem. Since Comp Cams made the base circle too small, he needs to move his rocker arms closer to the lifters to get more preload.

then it sounds like he should pik a difernt cam co.

 

[cudavert]

Shimming works if you've milled your heads, block, or just want to get less preload on hydraulic lifters for higher rpm. You are moving your rocker arms away from the lifters.

He has the opposite problem. Since Comp Cams made the base circle too small, he needs to move his rocker arms closer to the lifters to get more preload.

Then I guess he needs to keep milling his heads more......:cheers:

 

[Snake]

Well i am now thinking of a Mopar purple cam.Sure wish I did my home work befor i bought that comp cam.