To those with cams.

[3400-95-Modified]

I thought Jackal was answering my original question about pushrod length, I didn't have the question about the degreeing of the cam.

I was going to just install mine as the gear alows it because I didn't have any other options as far as degreeing.

As far as pushrod length goes I was instructed to build the engine and measure the length at zero lash using an adjustable one and then add .030 for proper hydraulic preload, and then to order the rods.

[SappySE107]

Correct, you want them to be between .020 and .040 preload. .035 is a lot to lose.

[3400-95-Modified]

Thank you for clearing that up Ben, I guess thats what I will be doing then.

[jackal2000]

I'm not sure how milzy grinds his cores to fit

i took that as a question, my fault.

[sprucegagt]

How does .035 in pushrod length not matter as much with stock rockers vs roller tip?

Because of your contact point. Roller tip rockers have a small contact patch when compared to stock flat tip rockers. With a bigger patch you have more tolerance for pushrod length vs. a smaller patch where if it sits to high or low on the valve stem it will lead to premature valve guide and stem wear. Now this all assumes you have the proper preload to begin with.

http://www.circletrack.com/techartic...ushrod_length/

[SappySE107]

I had it all typed out about the position of the rocker to valve tip...then decided to read the rest of the article. Good link I figured the non roller tip would just put more side loading pressure on the valve with incorrect length rockers but compared to roller tip that makes sense to be more dramatic.

[sprucegagt]

Now to follow along with getting correct pushrod length. Would this pushrod length checker be correct for 60* V6s.

http://store.summitracing.com/partde...5&autoview=sku

[SappySE107]

Wow, I didn't know that existed. I never found one that was below 6".

[Rhedalert]

Who's good at making pushrods nowadays??

[SappySE107]

I will have one of those checkers tomorrow

[bszopi]

Crower also makes a checker that will do less than 6". I used to own one, but let a member borrow it a couple years back, and I haven't seen him around much at all. Might have to see if I can dig up his email addy and get that thing back!

[sprucegagt]

Who's good at making pushrods nowadays??

Smith Brothers

http://www.pushrods.net

I will have one of those checkers tomorrow

Glad I could help and I'll take that as a "yes" to my question.

[SappySE107]

I am going to check the stock cam and see how the stock length works out. I would hope 5.8 is short enough and I know 6.8 is plenty.

[AaronGTR]

Because of your contact point. Roller tip rockers have a small contact patch when compared to stock flat tip rockers. With a bigger patch you have more tolerance for pushrod length vs. a smaller patch where if it sits to high or low on the valve stem it will lead to premature valve guide and stem wear. Now this all assumes you have the proper preload to begin with.

http://www.circletrack.com/techartic...ushrod_length/

The question isn't about lining up the contact point on the valve stem though. If that's what you are talking about, yes the stock rockers have more tolerance than a roller tip.

Thats not the problem. The problem is lost lift. If you lose .035" radius on the base circle and don't add it to the push rod, you are losing .056" of lift at the valve, no matter what rocker you are using.

[SappySE107]

No way. If you use a rocker arm like the gold race rockers, you can get full lift using different lengths. The problem is the contact point and how it sweeps across the valve stem tip.