Roller Block?
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
A roller block is machined to accept "spiders" (one on either side of the valley) that have "fingers" which ride atop and on either side of each roller lifter to revent rotation of the lifer as it moves up/down. Such rotation with a flat tappet cam is necessary for long lifter life but rotation of a roller lifter is disasterous.
Of course the cam, lifters and push rod lengths differ between the two also, but are not technically "the block".
I've not heard/read anything about cam bearing differences.
Of course the cam, lifters and push rod lengths differ between the two also, but are not technically "the block".
I've not heard/read anything about cam bearing differences.
Thread Starter
Pro
Joined: Nov 2004
Posts: 677
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From: Frisco TX
Originally Posted by 65Z01
A roller block is machined to accept "spiders" (one on either side of the valley) that have "fingers" which ride atop and on either side of each roller lifter to revent rotation of the lifer as it moves up/down. Such rotation with a flat tappet cam is necessary for long lifter life but rotation of a roller lifter is disasterous.
Of course the cam, lifters and push rod lengths differ between the two also, but are not technically "the block".
I've not heard/read anything about cam bearing differences.
Of course the cam, lifters and push rod lengths differ between the two also, but are not technically "the block".
I've not heard/read anything about cam bearing differences.
I assume that the "Spiders" and "fingers" should be seen when the intake is removed from the motor? This is the vally of a block that I was thinking about rebuilding for the 89.
If my assumptions are correct then this is a Flat Tappet motor with hyd. lifters.
[EDIT]
Ok, so after looking at the service manual it looks like the Valve Lifter Restrictor Retainer and the Valve Lifter Restrictors are something that can be added to this 350 by getting a new pair when I order the new lifters. (I want the motor built before I start to take my existing motor out.)
Last edited by RocketSapp; May 21, 2005 at 03:38 AM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
On a roller block, the 3 holes down the center of the valley are tapped for bolt to hold the spider down.
The cam has a retainer plate held by 2 bolts (visible behind the cam sprocket ) and the cam has a machined lip that the retainer seats into.
The cam has a retainer plate held by 2 bolts (visible behind the cam sprocket ) and the cam has a machined lip that the retainer seats into.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by RocketSapp
Thanks for the reply. Sorry it has taken me so long to get back to it.
I assume that the "Spiders" and "fingers" should be seen when the intake is removed from the motor? This is the vally of a block that I was thinking about rebuilding for the 89.
If my assumptions are correct then this is a Flat Tappet motor with hyd. lifters.
[EDIT]
Ok, so after looking at the service manual it looks like the Valve Lifter Restrictor Retainer and the Valve Lifter Restrictors are something that can be added to this 350 by getting a new pair when I order the new lifters. (I want the motor built before I start to take my existing motor out.)
I assume that the "Spiders" and "fingers" should be seen when the intake is removed from the motor? This is the vally of a block that I was thinking about rebuilding for the 89.
If my assumptions are correct then this is a Flat Tappet motor with hyd. lifters.
[EDIT]
Ok, so after looking at the service manual it looks like the Valve Lifter Restrictor Retainer and the Valve Lifter Restrictors are something that can be added to this 350 by getting a new pair when I order the new lifters. (I want the motor built before I start to take my existing motor out.)
Team Owner
Joined: Aug 2000
Posts: 24,125
Likes: 3
St. Jude Donor '14
A roller block will also uses a cam retainer. You'll see two bolt holes on the block, one on either side of the cam, behind the cam timing sprocket.
Last edited by 8388; May 21, 2005 at 10:19 AM.
Thread Starter
Pro
Joined: Nov 2004
Posts: 677
Likes: 0
From: Frisco TX
Originally Posted by 8388
A roller block will also uses a cam retainer. You'll see two bolt holes on the block, one on either side of the cam, behind the cam timing sprocket.
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