Pushrod Length/Geometry
Thread Starter
Pro
Joined: Nov 2009
Posts: 583
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From: Maple Grove Minnesota
Pushrod Length/Geometry
Is it possible to need two different size pushrods?
I went to check pushrod length on the 350 roller I’m building with an adjustable length checker.
I’m running Trickflow Twisted Wedge heads with the required Crane Gold 11750-16 roller rockers.
On cylinder #1 I found the right length/geometry for the exhaust valve and locked the checker in place with the two nuts.
I then put the checker on the intake valve and it was impossible to get any preload.
In order to get any preload and correct geometry I had to lengthen the rod three turns. Is this at all possible or am I doing something wrong?
Keep in mind I have not done this before so I could very well be doing it wrong.
I went to check pushrod length on the 350 roller I’m building with an adjustable length checker.
I’m running Trickflow Twisted Wedge heads with the required Crane Gold 11750-16 roller rockers.
On cylinder #1 I found the right length/geometry for the exhaust valve and locked the checker in place with the two nuts.
I then put the checker on the intake valve and it was impossible to get any preload.
In order to get any preload and correct geometry I had to lengthen the rod three turns. Is this at all possible or am I doing something wrong?
Keep in mind I have not done this before so I could very well be doing it wrong.
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
http://www.hotrodders.com/forum/1st-...ml#post1405940
http://www.chevelles.com/forums/showthread.php?t=17310
Thread Starter
Pro
Joined: Nov 2009
Posts: 583
Likes: 0
From: Maple Grove Minnesota
Due to the 13 degree angle on the intake valve would appear you are not the 1st to have this problem
http://www.hotrodders.com/forum/1st-...ml#post1405940
http://www.chevelles.com/forums/showthread.php?t=17310
http://www.hotrodders.com/forum/1st-...ml#post1405940
http://www.chevelles.com/forums/showthread.php?t=17310
Thread Starter
Pro
Joined: Nov 2009
Posts: 583
Likes: 0
From: Maple Grove Minnesota
If I’m doing this incorrectly can someone explain the proper procedure?
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Thread Starter
Pro
Joined: Nov 2009
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From: Maple Grove Minnesota
These Twisted Wedge heads are a PITA. I’ve used several different markers, Prussian blue, and checking springs and can’t get enough impression on the valve steam to tell if it’s centered or how wide it is.
WHAT IS BLUING? Only thing I haven’t tried. About ready to put the motor in the back of the Suburban and take it to a builder or go to a different head…
WHAT IS BLUING? Only thing I haven’t tried. About ready to put the motor in the back of the Suburban and take it to a builder or go to a different head…
Safety Car
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
These Twisted Wedge heads are a PITA. I’ve used several different markers, Prussian blue, and checking springs and can’t get enough impression on the valve steam to tell if it’s centered or how wide it is.
WHAT IS BLUING? Only thing I haven’t tried. About ready to put the motor in the back of the Suburban and take it to a builder or go to a different head…
WHAT IS BLUING? Only thing I haven’t tried. About ready to put the motor in the back of the Suburban and take it to a builder or go to a different head…
Once you get the rocker your checking near max lift roll the engine back forth (forward and backwards) to and past max lift 5-6 times... You'll have a nice pattern to see.
Those cyl heads were discontinued after a fairly short production run.... Lots of problems. I hate to say it but, no one I know that ever built an engine with them was very happy with them. The SBF version is one of the greatest street cyl heads ever built but the SBC version was not.
Will