Notices
Dynamometer Results & Comparisons Dyno Records | Dyno Discussion | Dyno Wars

MMS205 results thread...

 
Old 06-02-2019, 12:31 AM
  #1  
TECH Fanatic
Thread Starter
 
Join Date: Jul 2013
Location: Portland, Oregon
Posts: 1,881
Likes: 0
Received 0 Likes on 0 Posts
Default MMS205 results thread...

I have been in love with these heads since I first heard about them, and all of the old school AFR205 results speak for themselves.

Has anyone dyno'ed or tracked a set of these heads?

I am particularly interested in results with the 3.898" bore, but any/all results are definitely welcome.

Ultimately I want to use them on a 372ci "square" stroker, using a GenIV 3.898" iron block, and a custom 3.898" Magnum XL crank. But that doesn't really mean anything, right meow.
DavidBoren is offline  
Old 06-08-2019, 09:57 AM
  #2  
TECH Fanatic
iTrader: (4)
 
64post's Avatar
 
Join Date: Nov 2011
Location: Sonoma Co. Ca.
Posts: 1,019
Received 0 Likes on 0 Posts
Default

.....................................crickets..... ..
64post is offline  
Old 06-08-2019, 12:11 PM
  #3  
TECH Junkie
 
Tuskyz28's Avatar
 
Join Date: Sep 2014
Posts: 3,522
Received 0 Likes on 0 Posts
Default

David, i say go ahead and build it. Some of the OLD heads are better than this new crap.
Tuskyz28 is offline  
Old 06-08-2019, 01:39 PM
  #4  
TECH Enthusiast
 
Join Date: Sep 2010
Posts: 724
Likes: 0
Received 3 Likes on 3 Posts
Default

I would use the AFR head on something like an LS1 due to the 205cc runner.
It would be a killer on this engine although I would rebuild the LS1 with better internals as these engines are kind of lazy and don't like to rev that well.
Rebuilding them fixes that right up.
bortous is offline  
Old 06-08-2019, 02:26 PM
  #5  
TECH Fanatic
 
Join Date: Aug 2009
Location: Coast of San Mateo County Between Pacifica & HMB
Posts: 1,538
Likes: 0
Received 1 Like on 1 Post
Default

The MMS 205 is a completely different head from the original AFR 205 designed by Tony back in the day.
The new (comparatively) MMS 205 starts as an AFR casting with a 180 cc port before Tony"s CNC program, and
utilizes a 1.97" Intake valve and was/is designed for the 5.3 liter bore size.
NAVYBLUE210 is online now  
Old 06-08-2019, 02:33 PM
  #6  
TECH Senior Member
iTrader: (4)
 
99 Black Bird T/A's Avatar
 
Join Date: Nov 2001
Posts: 6,333
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Tuskyz28 View Post
David, i say go ahead and build it. Some a lot of the OLD heads are better than this new crap.
Agreed

99 Black Bird T/A is online now  
Old 06-08-2019, 03:28 PM
  #7  
TECH Fanatic
Thread Starter
 
Join Date: Jul 2013
Location: Portland, Oregon
Posts: 1,881
Likes: 0
Received 0 Likes on 0 Posts
Default

I was hoping that someone on here would have used them by now. I know FastBrick had a set for a 5.3 he was building, but I can't find anything that signifies he completed it.

In the MMS223 Sportsman head introduction thread, Tony says the MMS205 flows 298cfm on a 3.78" bore, some ports flowed 300, but he felt 298 was a better average. I believe in the same thread, Tony says that the MMS205 has a ~82% exhaust ratio. This is essentially all the information I can find without bugging the man himself.

I would love to be in a position that I could feasibly build the square 373ci (3.9"x3.9"), but that just is not in the cards right meow.

Mounting them on a 3.9" bore will only increase flow and coefficient of discharge. And a 3.9" stroke will help put some pull on the heads. There are plenty of intakes that can flow everything these heads ever will, so with the proper spec'd cam, this thing should comfortably max out everything the heads are capable of delivering.
DavidBoren is offline  
Old 06-09-2019, 12:35 AM
  #8  
TECH Enthusiast
 
Join Date: Sep 2010
Posts: 724
Likes: 0
Received 3 Likes on 3 Posts
Default

Originally Posted by DavidBoren View Post
I was hoping that someone on here would have used them by now. I know FastBrick had a set for a 5.3 he was building, but I can't find anything that signifies he completed it.

In the MMS223 Sportsman head introduction thread, Tony says the MMS205 flows 298cfm on a 3.78" bore, some ports flowed 300, but he felt 298 was a better average. I believe in the same thread, Tony says that the MMS205 has a ~82% exhaust ratio. This is essentially all the information I can find without bugging the man himself.

I would love to be in a position that I could feasibly build the square 373ci (3.9"x3.9"), but that just is not in the cards right meow.

Mounting them on a 3.9" bore will only increase flow and coefficient of discharge. And a 3.9" stroke will help put some pull on the heads. There are plenty of intakes that can flow everything these heads ever will, so with the proper spec'd cam, this thing should comfortably max out everything the heads are capable of delivering.
That's true.
Very efficient setup.
Tony did tell me for an LS 408 on a 4.030 bore the best size head to use is a 245cc.
bortous is offline  
 


Thread Tools
Search this Thread

About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: