"Small" Solid Roller 327, Advice? - Team Camaro Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 11 (permalink) Old Sep 9th, 08, 12:47 PM Thread Starter
Senior Tech
Steven
 
Join Date: Jun 2001
Location: Sacramento, CA
Posts: 413
"Small" Solid Roller 327, Advice?

It's time for me to do a cam swap, and I was leaning to the Comp XS274S solid flat tappet until I began reading about the annoying break-in procedures and greater chance of killing a lobe...all that and they make less power than a roller setup. I'm a "solid" type of guy, and really like the idea of the XR274R solid roller. I'm 24 and this is not my daily driver...I don't want to completely mismatch a cam with what I have, but I do like to make a 327 scream up high and have a solid middle.

XR274R
INT EXH
ADV: 274 280
0.050: 236 240
Lift: 0.564 0.570
LCA: 110
ICL: 106

My Combo
I have a +0.030 327 stock deck, stock pistons
200cc Aluminum Pro Toplines (too big I know, for an engine build that never happened)
64cc chambers
1.52 Pro Magnum Rockers
9.25 comp w/ 0.028 gaskets (close estimate)
Weiand Dual Plane manifold
Edelbrock 600cfm carb
Tremec TKO 5 speed
3.73 rear end
No power brakes

I know my existing combo could use some improvement...but what do you guys think of the XR274R cam? Thanks!! Power estimates?

Last edited by sik68; Sep 9th, 08 at 02:35 PM.
sik68 is offline  
Sponsored Links
Advertisement
 
post #2 of 11 (permalink) Old Sep 9th, 08, 02:11 PM
Senior Tech
 
Join Date: Dec 2001
Location: Fairfield, CA
Posts: 6,246
Re: "Small" Solid Roller 327, Advice?

The XR274R in my Comp catalog has 0.377" and 0.381" lobe lift. In order to get the 0.639" valve lift you'd have to use a 1.7:1 rocker arm ratio. With a standard 1.5:1 ratio the lift will be a more reasonable .564"/.570".

It should run pretty well in a 327.

"For those that will fight for it...FREEDOM ...has a flavor the protected shall never know."
Semper Fi! L/Cpl Edwin L. "Tim" Craft, B Co 3rd AT's, Khe Sanh Combat Base, February, 1968
onovakind67 is offline  
post #3 of 11 (permalink) Old Sep 9th, 08, 02:15 PM Thread Starter
Senior Tech
Steven
 
Join Date: Jun 2001
Location: Sacramento, CA
Posts: 413
Re: "Small" Solid Roller 327, Advice?

Quote:
Originally Posted by onovakind67 View Post
The XR274R in my Comp catalog has 0.377" and 0.381" lobe lift. In order to get the 0.639" valve lift you'd have to use a 1.7:1 rocker arm ratio. With a standard 1.5:1 ratio the lift will be a more reasonable .564"/.570".

It should run pretty well in a 327.
Whoops, that was the BBC version! Makes much more sense now...

Thanks!
sik68 is offline  
 
post #4 of 11 (permalink) Old Sep 9th, 08, 02:19 PM
Senior Tech
Tom
 
Join Date: Jun 2001
Location: Rochester Mn
Posts: 7,749
Re: "Small" Solid Roller 327, Advice?

You should be all right with that cam, since you are running the Pro-Topline heads. If they were stock Double Humps or something, they probably wouldn't breath well enough for that cam.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
TJS69 is offline  
post #5 of 11 (permalink) Old Sep 9th, 08, 02:31 PM
Tom
 
Join Date: Jan 2007
Location: Bowie,Maryland
Posts: 26
Re: "Small" Solid Roller 327, Advice?

I'm thinking that your cr is too low for that big cam, I may be wrong.
ermine67 is offline  
post #6 of 11 (permalink) Old Sep 9th, 08, 03:01 PM
Senior Tech
AJ
 
Join Date: Jul 2006
Location: AUSTIN TEXAS
Posts: 3,842
Re: "Small" Solid Roller 327, Advice?

Quote:
Originally Posted by ermine67 View Post
I'm thinking that your cr is too low for that big cam, I may be wrong.
I agree with you.
You can run this cam and see benefits, it's a roller (more power!) and will rev high, but don't change your intake to a single plane whatever you do, I bet you would have a hell of a time taking off from lights and idle quality would diminish. that is what is happening to me.

The only Mustang I'd ever own is a Fender.

'68 333" Camaro
'14 5.0 Mustang
ace's68 is offline  
post #7 of 11 (permalink) Old Sep 9th, 08, 03:22 PM
Senior Tech
 
Join Date: Dec 2001
Location: Fairfield, CA
Posts: 6,246
Re: "Small" Solid Roller 327, Advice?

I think it will work just fine with 3.73 gears and a 3.27 1st gear. My 327 with a 240°/240° solid roller had no trouble at all driving right away from a stoplight, made peak torque at about 4500 rpm and was well over 300#ft to the rear wheels at about 3000 rpm.

"For those that will fight for it...FREEDOM ...has a flavor the protected shall never know."
Semper Fi! L/Cpl Edwin L. "Tim" Craft, B Co 3rd AT's, Khe Sanh Combat Base, February, 1968
onovakind67 is offline  
post #8 of 11 (permalink) Old Sep 9th, 08, 07:21 PM
Gold Lifetime Member
Tom
 
Join Date: Mar 2008
Location: the 02176
Posts: 5,985
Re: "Small" Solid Roller 327, Advice?

FWIW, Jan 08 Super Chevy ran an article where they put the smallest THumpr roller in a 327 with 9.9:1 and ported 1.94's and made 399 lb-ft and 416 HP. It had less intake duration and less lift than the XR274R.

'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
-
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Melrose RS is offline  
post #9 of 11 (permalink) Old Sep 9th, 08, 08:58 PM Thread Starter
Senior Tech
Steven
 
Join Date: Jun 2001
Location: Sacramento, CA
Posts: 413
Re: "Small" Solid Roller 327, Advice?

Quote:
Originally Posted by onovakind67 View Post
I think it will work just fine with 3.73 gears and a 3.27 1st gear. My 327 with a 240/240 solid roller had no trouble at all driving right away from a stoplight, made peak torque at about 4500 rpm and was well over 300#ft to the rear wheels at about 3000 rpm.
Oh man, I found that 2 barrel vs 4 barrel (on that 327) thread you wrote 3 years ago, and those numbers you posted are impressive! I know my combo will be shy of what your 327 put down, but it just shows what the often overlooked 327's can do. With a solid roller, it's almost too easy!

Quote:
Originally Posted by Melrose RS
FWIW, Jan 08 Super Chevy ran an article where they put the smallest THumpr roller in a 327 with 9.9:1 and ported 1.94's and made 399 lb-ft and 416 HP. It had less intake duration and less lift than the XR274R.
Thanks for the tip! I am going to scour the site for that article.
sik68 is offline  
post #10 of 11 (permalink) Old Sep 10th, 08, 08:51 AM
Gold Lifetime Member
Tom
 
Join Date: Mar 2008
Location: the 02176
Posts: 5,985
Re: "Small" Solid Roller 327, Advice?

Quote:
Originally Posted by sik68 View Post
Oh man, I found that 2 barrel vs 4 barrel (on that 327) thread you wrote 3 years ago, and those numbers you posted are impressive! I know my combo will be shy of what your 327 put down, but it just shows what the often overlooked 327's can do. With a solid roller, it's almost too easy!



Thanks for the tip! I am going to scour the site for that article.
If you can't get it, let me know, I'll fax you a copy.

'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
-
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Melrose RS is offline  
post #11 of 11 (permalink) Old Sep 10th, 08, 09:09 AM Thread Starter
Senior Tech
Steven
 
Join Date: Jun 2001
Location: Sacramento, CA
Posts: 413
Re: "Small" Solid Roller 327, Advice?

Melrose, I couldn't find it...it would be great if you could fax it! You have PM
sik68 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome