retro-fitting a roller cam
Thread Starter
Melting Slicks
Joined: Aug 2004
Posts: 2,165
Likes: 950
From: Keizer Oregon
retro-fitting a roller cam
Well now that I have replacement block for my cracked stroker motor (thanks again Randy) I am looking to change to a hydraulic roller cam......the block is an old style 2-piece rear seal. I know their are some roller lifters with "bars" that prevent them from spinning in their bores.....what are all the parts I would need for the changeover???
Since the block is going to the machine shop for mag/wash/bore/hone/machine for stokercrank, can I have it machined to accept non-conversion style cam/lifters??? or do I need to stick with the conversion kit??
I am looking for a set-up that will be pushing 500hp for the 383...(I already have 1.6 roller rockers)...so maybe a cam with ~.500-.530 lift (not including 1.6 ratio rockers).....Aluminum RPM heads are at the shop for a port polish...should gain>40cfm
Any fav. roller set-ups??????
Thanks
Since the block is going to the machine shop for mag/wash/bore/hone/machine for stokercrank, can I have it machined to accept non-conversion style cam/lifters??? or do I need to stick with the conversion kit??
I am looking for a set-up that will be pushing 500hp for the 383...(I already have 1.6 roller rockers)...so maybe a cam with ~.500-.530 lift (not including 1.6 ratio rockers).....Aluminum RPM heads are at the shop for a port polish...should gain>40cfm
Any fav. roller set-ups??????
Thanks
Team Owner
Joined: Oct 2004
Posts: 23,831
Likes: 10
From: Springfield MO
St. Jude Donor '07
This was just discussed (in a thread started by me) a few weeks ago. A guy sells directions for $20 on eBay.
http://forums.corvetteforum.com/show...ter&forum_id=3
http://forums.corvetteforum.com/show...ter&forum_id=3
Instructor
Joined: Feb 2005
Posts: 215
Likes: 1
From: Belton Missouri
The above retrofit of modern roller parts is really cool, wish I would have known about it sooner.
I run the Comp Cams retro lifters and camshaft (specs below). You will also need new pushrods, and a cam button and cam button retainer. I got a pushrod size tool to figure the proper length.
With flat top pistons, AFR 195 heads, this engine is rated +\- 385 RWHP.
Cam Specs:
Part Number: 12-000-8
Custom Grind: CS 3109S / 3112S HR112+4
Intake Exhaust
Gross Valve Lift: .513 .510
Duration @ 276 290
.006 Tappet Lift:
Valve Timing: Open Closed
@ .050: Int: 2 BTDC 38 ABDC
Exh: 51 BBDC 1- ATDC
These specs are for cam installed @ 108.0 Intake Center Line:
Intake Exhaust
Duration @ .050 220 230
Lobe Lift .3420 .3400
Lobe Seperation 112.0
Nice idle, good vacuum, sounds like a big block, and loads of torque.
Audie
I run the Comp Cams retro lifters and camshaft (specs below). You will also need new pushrods, and a cam button and cam button retainer. I got a pushrod size tool to figure the proper length.
With flat top pistons, AFR 195 heads, this engine is rated +\- 385 RWHP.
Cam Specs:
Part Number: 12-000-8
Custom Grind: CS 3109S / 3112S HR112+4
Intake Exhaust
Gross Valve Lift: .513 .510
Duration @ 276 290
.006 Tappet Lift:
Valve Timing: Open Closed
@ .050: Int: 2 BTDC 38 ABDC
Exh: 51 BBDC 1- ATDC
These specs are for cam installed @ 108.0 Intake Center Line:
Intake Exhaust
Duration @ .050 220 230
Lobe Lift .3420 .3400
Lobe Seperation 112.0
Nice idle, good vacuum, sounds like a big block, and loads of torque.
Audie
Team Owner
Joined: Oct 2004
Posts: 23,831
Likes: 10
From: Springfield MO
St. Jude Donor '07
The horror stories I've heard about the link-bar design scared me away from the retrofits (not to mention the price). That's why I started wondering if something wasn't possible with factory parts.
Le Mans Master
Joined: Jul 2001
Posts: 9,622
Likes: 16
From: absecon nj
Originally Posted by I'm Batman
The horror stories I've heard about the link-bar design scared me away from the retrofits (not to mention the price). That's why I started wondering if something wasn't possible with factory parts.
