MMS heads ????
Thread Starter
Safety Car
Joined: Apr 2004
Posts: 3,818
Likes: 4
From: San Bruno ca
MMS heads ????
I bought this car a few months ago and it was stated that it had MMS stage 2 heads (ls1 341) Can anyone tell me more about these heads or what MMS stands for Thanks
Jerome
Jerome
Drifting
Joined: Feb 2000
Posts: 1,922
Likes: 0
From: Boulder, Colorado
MMS = Morgan Motorsports. Used to be a very reputable shop, but come to think of it, I haven't heard anything about them in quite a while.
I did a search on ls1tech, and found this thread:
http://www.ls1tech.com/forums/showthread.php?t=135206
If that's correct, then it looks like this is the site for the new company:
http://www.spmotorsports.net/
I did a search on ls1tech, and found this thread:
http://www.ls1tech.com/forums/showthread.php?t=135206
If that's correct, then it looks like this is the site for the new company:
http://www.spmotorsports.net/
Thread Starter
Safety Car
Joined: Apr 2004
Posts: 3,818
Likes: 4
From: San Bruno ca
Originally Posted by Miles in Michigan
MMS = Morgan Motorsports. Used to be a very reputable shop, but come to think of it, I haven't heard anything about them in quite a while.
I did a search on ls1tech, and found this thread:
http://www.ls1tech.com/forums/showthread.php?t=135206
If that's correct, then it looks like this is the site for the new company:
http://www.spmotorsports.net/
I did a search on ls1tech, and found this thread:
http://www.ls1tech.com/forums/showthread.php?t=135206
If that's correct, then it looks like this is the site for the new company:
http://www.spmotorsports.net/
Burning Brakes
Joined: Jul 2003
Posts: 843
Likes: 9
From: Laguna Hills CA
Mike used a generic CNC program that netted decent numbers . . . average all in all. A couple different variations of his stage 2 heads were used regularly, the biggest difference was the core head stock [LS1 or LS6], and whether the heads were shaved or not . . . end result, either a "high compression" or "regular compression" set of heads. Depending upon when the car was put together and how many miles are on the motor, you could end up with a very solid motor, or one with a few . . . . quirks. I've had a few issues, but have had reasonably good luck. IIRC, Mike got out of the business for a variety of reasons.
My biggest recommendation, is to listen for excessive valvetrain noise -- it beats pulling the valve covers off and checking clearances, especially on shaved heads.
My biggest recommendation, is to listen for excessive valvetrain noise -- it beats pulling the valve covers off and checking clearances, especially on shaved heads.
Thread Starter
Safety Car
Joined: Apr 2004
Posts: 3,818
Likes: 4
From: San Bruno ca
Originally Posted by emf
Mike used a generic CNC program that netted decent numbers . . . average all in all. A couple different variations of his stage 2 heads were used regularly, the biggest difference was the core head stock [LS1 or LS6], and whether the heads were shaved or not . . . end result, either a "high compression" or "regular compression" set of heads. Depending upon when the car was put together and how many miles are on the motor, you could end up with a very solid motor, or one with a few . . . . quirks. I've had a few issues, but have had reasonably good luck. IIRC, Mike got out of the business for a variety of reasons.
My biggest recommendation, is to listen for excessive valvetrain noise -- it beats pulling the valve covers off and checking clearances, especially on shaved heads.
My biggest recommendation, is to listen for excessive valvetrain noise -- it beats pulling the valve covers off and checking clearances, especially on shaved heads.
thanks
jerome
Burning Brakes
Joined: Jul 2003
Posts: 843
Likes: 9
From: Laguna Hills CA
knowing what castings were used as a core will help . . . I know the flow numbers for a few MMS heads based on the research that I did before taking the car to them. Depending, you'll either get ~ 30-40cfm on the top end, or get 0 . . . wildly enough, I did see that big of a swing between LS1 and LS6 heads from them.
Drifting
Joined: Oct 2002
Posts: 1,335
Likes: 76
From: Bedford Va.
I would be concerned with valve springs. I have MMS stage-2 zo6 heads on my car. I purchased them around Nov. 2002 they had REV dual springs on them. I would classify the heads as mild CNC ported and polished, stock valve size. Most heads are milled, my heads were not at my request.
as you probably know the REV springs from that time do not last long.
I have seen postings of failed springs with 3000 miles. I broke one at 12000 miles.
hope this helps
as you probably know the REV springs from that time do not last long.
I have seen postings of failed springs with 3000 miles. I broke one at 12000 miles.
hope this helps
Burning Brakes
Joined: Jul 2003
Posts: 843
Likes: 9
From: Laguna Hills CA
Mine snapped at 8k . . . inner spring saved the day from the extra 30 seconds that the car ran. To MMS's credit, there were a bunch more problems w/ the springs . . . . but that's a different story. Check the valves for wear, but do pay attention to the springs.
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Le Mans Master
Joined: Jan 2001
Posts: 5,786
Likes: 6
From: Lafayette Colorado
I had his early stage IIIx 5.3L heads. These heads where actually hand ported before he started to use the generic CNC program. They where pretty good heads. Broke a spring though with only 7000 miles. Inner spring saved my butt from a lot of damage..... 
Keith
Keith
Safety Car
Joined: May 2000
Posts: 4,827
Likes: 352
From: Albuquerque NM
I've had my MMS Stage IIx heads on since 2000. No spring problems (Erson springs used then). I don't have flow numbers but considering I am using a baby cam (218/218, 114 LSA, .561" lift) the heads must flow pretty well to get 413/390 rw sae.