Pushrod length question
Thread Starter
Le Mans Master
Joined: Dec 2002
Posts: 5,270
Likes: 3
From: Seattle Area WA
Pushrod length question
Ok, so I am rebuilding a 350 4-bolt from ~'75.
I bought the block with the bottom end assembled. And everything (now) appears to be great.
The top of the block seems flat and smooth.
I am assuming it was decked???
(Previous owner is unsure)
Anyway to tell?
Also, my heads were milled 0.010".
Can I just run a stock length pushrod?
Or should I look into custom length, its a street motor.
Thanks!
I bought the block with the bottom end assembled. And everything (now) appears to be great.
The top of the block seems flat and smooth.
I am assuming it was decked???
(Previous owner is unsure)
Anyway to tell?
Also, my heads were milled 0.010".
Can I just run a stock length pushrod?
Or should I look into custom length, its a street motor.
Thanks!
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
With milling likely done you should pick up one of the test push rods to determine proper length. Comp. Cams and others have such test push rods.
When push rod length is correct the rocker will sweep an equal distance from the center of the valve stem toward either edge as the valve goes from full closed to full open and back.
Once you've adjusted the test push rod to achieve that operation, you simply meansure the resultant push rod length and get a set as close as possible.
When push rod length is correct the rocker will sweep an equal distance from the center of the valve stem toward either edge as the valve goes from full closed to full open and back.
Once you've adjusted the test push rod to achieve that operation, you simply meansure the resultant push rod length and get a set as close as possible.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Don't know of any test springs - use the heads as assembled and installed on the motor. Lots of helpful info at the Cam Manufacturers' web sites - try www.cranecams.com and www.compcams.com - there are probably others.
