rithsleeper

Could I have done something wrong? I thought stock was 6.8" then I get crowler .300 extra for hydraulic roller block, and I do have the Afr 220cc and solid roller cam.

I got the adjustable pushrod to measure and it goes to 7.3 and it wasn't even close so I eyeballed it with a ruler and looks around 8.25. I ordered another measure tool and it arrives tomorrow. Afr said approx .200 for 220 from stock but that is way off. I don't see what I could have done wrong...

Don't see what it could hurt but would hate to make a big mistake this late in the game.

ANTI VENOM

I thought stock was 7.2" on a factory hydraulic roller block. Still no where near 8.25

cv67

Using a checking spring?

rithsleeper

Not using a check spring but a check spring wouldn't account for an inch! I dont think i need to anyway because i have a solid lifter not hydraulic. The max 7.3" tool won't even reach even close.

cv67

If youre using the solid roller spring its probably flexing (if not ready to break) badly trying to compress the spring.

rklessdriver

You can't compare stock hyd roller pushrods to what you are trying to build. You have .100 long valves, and despite the fact that the roller lifter body is .300 tall, the tall part is for the link bar to clear the block. The push rod seat is way lower in a mechanical roller lifter than a hyd lifter.

Push rod length is determined by the rocker geometry - end of story. Make the rocker geometry correct and let the push rod work out to whatever it is.
Will

rithsleeper

I'm having trouble getting the rocker to clear the retainer and have a good wear pattern on the valve stem. The wear pattern is still not centered and if I make the pushrod any smaller it would make the rocker contact the retainer when closed.

I'd say the pattern goes from the middle of the stem to about 1/4 of the way from the edge on the exhaust side. So I can't bring it any closer without clearancing the rocker (bad idea running a solid lifter spring) or buying a whole other set of rockers..... This is now the second set I'm on since original plans were 3/8 stud but realized 7/16 was the way to go.

Is this normal?


I am just using a stock spring which is same diameter as the inside spring on my big springs to measure. It is low pressure and does the job

C409

..... Try some lash caps ... your valve locks are set up for them ......... BTW ... those are the wrong retainers unless you are checking with the inner spring only .....

rklessdriver

Yep. Your gonna need lash caps.
Will

rithsleeper

That is a stock valve spring to do my measurements with. My other springs are way bigger. Would you guys ever try clearancing a rocker arm for this or would that compromise structural integrity?

rklessdriver

I have clearanced lots of rocker arms in the past for spring reatiner clearance....

I would NOT clearence those steel Comp rockers you have on there. IMO the distance that you need to lower the rocker trunion to get the proper rocker geometry without lash caps is going to require too much metal be ground out of the rocker body.

The reason your having this problem is because the valves are not long enough to get the set up height for those springs so AFR uses a +.050 lock and +.050 retainer.... it's a common way of doing things but it puts the valve stem tip down below the retainer step.

Lash caps are .080 thick and will put the valve tip up taller past the retainer step.... allowing for the rocker body to clear the spring retainer.

Lash caps are going to cost you $40.00

http://www.summitracing.com/parts/man-42125-8/overview/

Will

C409

..... ..... I agree that lash caps will improve your geometry situation ... but I would recommend some that have a tiny hole in the top to relieve the surface tension of the oil ... it makes them sooo much easier to remove and insures that they will seat all the way down on top of the valve tip ...........