Rocker arm comparison

[Tim]

Thats actually the very top of the rocker stud. Lol

Never seen the top of a stud look like that. Looks like a bolt!
I’m winning all kinds of stupid awards today! I should go back to bed

 

[63409impala]

Had plenty or room on mine with big trunnions. View attachment 93711

Big in diameter isn't an issue. Big as in width is the issue.

 

[63409impala]

Never seen the top of a stud look like that. Looks like a bolt!
I’m winning all kinds of stupid awards today! I should go back to bed

Lol its ok man. Most of us have brain farts daily. Me however, my brain shits it's pants on a daily basis.

 

[skipxt4]

You're not alone.

 

[Tim]

 

[Skip FIx]

I have Comps SS on my E heads not problems,even swapped 1.8s in place of the 1.7s on the dyno. Maybe they changed the trunnions or the E hedas have a different spacing. I know the Pontiac E heads exhaust valve moved over about 0.050.

I have HS on a lot of my Pontiac motors with good luck. Got a "deal" on a Crower SS shaft system for a Pontiac that I basically had to re engineer for them stands, rocker cup offsets were all wrong. Then adjusting stand height then pushrid length you have even more variables.

 

[427John]

I distinctly remember Ronnie telling me that when using big block length valves correct geometry becomes a real PITA.Sounds like what you're running into here.

I've been watching this post and remembering other threads that had stated pretty much what Don said.As a matter of I once posted a question about using BBC valves to increase spring installed height,and was advised to avoid them due to problematic geometry.

 

[Fathead Racing]

I also run 1.8 ratio. Harland Sharp, off the shelf Comp Cams pushrods.

 

[63409impala]

I've been watching this post and remembering other threads that had stated pretty much what Don said.As a matter of I once posted a question about using BBC valves to increase spring installed height,and was advised to avoid them due to problematic geometry.

Wonderful. Lol

 

[NCPOP]

Lol its ok man. Most of us have brain farts daily. Me however, my brain shits it's pants on a daily basis.

For shizzle my nizzle

 

[63409impala]

Ok. Here is what I have so far. Intake pushrod is 8.900. Exhaust is 9.100. Not sure which way to go on exhaust. This is with 1.7 harland sharp rockers

 

[La Hot Rods]

Looks like you need a longer exhaust push rod.

 

[63409impala]

Ok. Thats where the fun begins. The longer it gets, the more the pattern goes towards the edge of the valve tip. The first pic is the exhaust and 2nd pic is intake.

 

[La Hot Rods]

It's okay if it moves off center, you just don't want it on the very edge of the valve.

 

[Tim]

I used an adjustable rod until I got it to this pattern for both intake and exhaust

 

[63409impala]

9.200 length on exhaust

 

[63409impala]

9.300 on exhaust.

 

[La Hot Rods]

Little hard to tell with the 9.30, can you cycle it more to get a better pattern?

 

[63409impala]

Here is a 9.250 cycled 4 times

 

[63409impala]

9.350 cycled 4 times. Will redo the 9.300 next.