chevy rockers???
Lead Driver
Joined: Mar 2008
Posts: 7,168
Likes: 375
From: Near Los Angeles
Read the sticky at the top of the forum, entitled: Tips/tricks.
The chevy rockers are 1.7 or 1.73 ratio. That moves the p.rod closer to the valve, and unless you have the slotted p.rod opening type, then it could rub. You are changing the geometry of the v.train.
But beware, you might actually have to spend $2. Maybe you can find some in a j/y and save fifty cents.
The chevy rockers are 1.7 or 1.73 ratio. That moves the p.rod closer to the valve, and unless you have the slotted p.rod opening type, then it could rub. You are changing the geometry of the v.train.
But beware, you might actually have to spend $2. Maybe you can find some in a j/y and save fifty cents.
More Turbo
Joined: Mar 2014
Posts: 621
Likes: 13
in the sticky it says:
"Simply ask for a set of rockers from a 75 C-10 with a 250 (4.1) inline six.
They are 1.73 ratio"
thinking about just buying those today. all good just to swap with no other mod ya?
It's an 86 300 motor.
"Simply ask for a set of rockers from a 75 C-10 with a 250 (4.1) inline six.
They are 1.73 ratio"
thinking about just buying those today. all good just to swap with no other mod ya?
It's an 86 300 motor.
Cargo Master
Joined: Feb 2003
Posts: 2,341
Likes: 5
From: Sacramento
An 86 may have the sled style rocker, like the 351C&M and 429/460. I'm sure someone has the info on how to tell before you pull the valve cover.
This is what those 1.75 rockers fit.
Make:CHEVROLET
Beginning Year:1963
Ending Year:1970
Engine Type:L6
Liter:3.8
CID:230
Engine Size:3.8L/230
Engine Family:GM inline 6-cylinder
Make:CHEVROLET
Beginning Year:1963
Ending Year:1984
Engine Type:L6
Liter:4.8
CID:292
Engine Size:4.8L/292
Engine Family:GM inline 6-cylinder
Make:CHEVROLET
Beginning Year:1965
Ending Year:1984
Engine Type:L6
Liter:4.1
CID:250
Engine Size:4.1L/250
Engine Family:GM inline 6-cylinder
This is what those 1.75 rockers fit.
Make:CHEVROLET
Beginning Year:1963
Ending Year:1970
Engine Type:L6
Liter:3.8
CID:230
Engine Size:3.8L/230
Engine Family:GM inline 6-cylinder
Make:CHEVROLET
Beginning Year:1963
Ending Year:1984
Engine Type:L6
Liter:4.8
CID:292
Engine Size:4.8L/292
Engine Family:GM inline 6-cylinder
Make:CHEVROLET
Beginning Year:1965
Ending Year:1984
Engine Type:L6
Liter:4.1
CID:250
Engine Size:4.1L/250
Engine Family:GM inline 6-cylinder
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Postmaster
Joined: Nov 2012
Posts: 2,806
Likes: 8
From: Langley, BC
If you've got money you could have the head machined for studs.
Junior User
Joined: Nov 2003
Posts: 87
Likes: 0
From: Hillsboro, Oregon
We did the chevy rocker are swap on my sons truck. We bought new lock nuts and added a washer between the fulcrum and the lock nut. As for adjustment, we followed the book for a starting point. After that I ran the rockers to zero lash and then added a 1/4 quarter turn tighter. Seems to run fine in our case. Granted we have no miles on it. We are working on other non engine related issues now.
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