roller rockers
Thread Starter
Burning Brakes
Joined: Jun 2003
Posts: 1,022
Likes: 6
From: CT
roller rockers
I'm getting all the parts together for my new 355, and the next item on the list is rockers. I'm going with full roller harland sharp rockers.
Do you have to machine the heads to use a 1.6 ratio rocker?
Do you have to machine the heads to use a 1.6 ratio rocker?
Racer
Joined: Sep 2004
Posts: 424
Likes: 2
You usally have to elongate the pushrod slot. They sell a tool to do this with a hand drill, I think Summit has it. Theoretically you can do this on the car, but you have to remove your intake manifold so you can catch the metal filings. Another thing you need to check is rocker arm to valve spring clearance through out a complete rotation. And since you will have more lift, you will also have to check for valve spring coil bind.
Race Director
Joined: Apr 2000
Posts: 17,672
Likes: 199
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
You have to do a mock up with the heads on and checking springs( just on one cylinder ) to see if the pushrods are going to hit the heads.
You have to do this because the 1.6 rockers will pull the pushrods in closer to the head, if you don't check you could have real problems later and have to pull the heads.
http://forums.corvetteforum.com/show....php?t=1120476
You have to do this because the 1.6 rockers will pull the pushrods in closer to the head, if you don't check you could have real problems later and have to pull the heads.
http://forums.corvetteforum.com/show....php?t=1120476
Thread Starter
Burning Brakes
Joined: Jun 2003
Posts: 1,022
Likes: 6
From: CT
I think I will go with the 1.6 ratio and then make sure to check the clearances. I also have to check pushrod length. I have the used comp cams push rods that came off the motor but I'm doing the whole motor with new solid cam, heads, springs, and rockers.
How do I check for pushrod length??
How do I check for pushrod length??
Melting Slicks
Joined: Dec 2001
Posts: 2,025
Likes: 1
From: Billings MT
You can pick up a simple plastic tool that looks like an upside down rocker arm to check the pushrod length.
You may have to change pushrod length if anything on the deck height has been significantly changed.
You may have to change pushrod length if anything on the deck height has been significantly changed.
