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MM 305 lobe
#2887596
02/13/21 12:44 PM
02/13/21 12:44 PM
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Joined: Nov 2011
Posts: 287
PA
Harry's Taxi 2
OP
enthusiast
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OP
enthusiast
Joined: Nov 2011
Posts: 287
PA
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Has anyone here use a Comp cams MM305 intake lobe with a 1.6 ratio rocker? If so, what spring pressure and rpm did you run it to?
Last edited by Harry's Taxi 2; 02/13/21 12:45 PM.
'86 Maple Grove KOS Mopar low qualifier......true street legal with no power adders.
NOS-used when losing since 1940.
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Re: MM 305 lobe
[Re: UKDART]
#2889295
02/16/21 04:44 PM
02/16/21 04:44 PM
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Joined: Nov 2011
Posts: 287
PA
Harry's Taxi 2
OP
enthusiast
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Joined: Nov 2011
Posts: 287
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I have this cam with 1.6 on the inlet using PAC -1916 springs. Shift at 6700 rpm, crosses line 7000-7100.
Love this cam 8.82@151 in my '67 Dart, 512 RB 14-1 comp cnc'd 440-1s Pro Systems methanol SV1. Thanks for the reply. I thought maybe a 1.6 rocker might make an already aggressive lobe a little too much so that's why I was asking for some real world info.
'86 Maple Grove KOS Mopar low qualifier......true street legal with no power adders.
NOS-used when losing since 1940.
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Re: MM 305 lobe
[Re: Harry's Taxi 2]
#2889333
02/16/21 06:42 PM
02/16/21 06:42 PM
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Joined: Oct 2006
Posts: 1,264
New York, USA
Chargerfan68
pro stock
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pro stock
Joined: Oct 2006
Posts: 1,264
New York, USA
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Just curious what the difference between the MM lobes and the XX lobes? I read the catalog descriptions, but looking for more detailed information. Design and actual intended useage difference as well as difference in spring requirements and maintenance. When i saw this post, i immediately thought i run this lobe family in my rb 505, but when i went to confirm, i saw it is the XX lobes. So curious about that info.
1.50 60Ft. , 10.75@ 127MPH Hauling 3900 LBS.
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Re: MM 305 lobe
[Re: UKDART]
#2889346
02/16/21 07:12 PM
02/16/21 07:12 PM
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Joined: Jan 2003
Posts: 16,928
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,928
NC
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I have this cam with 1.6 on the inlet using PAC -1916 springs. I ran that cam for years, with 1.5 rockers. Great flat tappet IMO. 150 lbs seat, 440 open is about right. That is a lot of pressure, so I used edm oiling lifters. 0.650"/0.630" MM305S
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Re: MM 305 lobe
[Re: Chargerfan68]
#2889511
02/17/21 07:11 AM
02/17/21 07:11 AM
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Joined: Nov 2011
Posts: 287
PA
Harry's Taxi 2
OP
enthusiast
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OP
enthusiast
Joined: Nov 2011
Posts: 287
PA
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Just curious what the difference between the MM lobes and the XX lobes? I read the catalog descriptions, but looking for more detailed information. Design and actual intended useage difference as well as difference in spring requirements and maintenance. When i saw this post, i immediately thought i run this lobe family in my rb 505, but when i went to confirm, i saw it is the XX lobes. So curious about that info. If you're asking me about the lobe differences, I'm probably not the one to ask. It does appear the intake lobe is an MM and the exhaust is an XX lobe. I measured the cam and it is what it's supposed to be. (that's been a problem for me with some other brands lately)
'86 Maple Grove KOS Mopar low qualifier......true street legal with no power adders.
NOS-used when losing since 1940.
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Re: MM 305 lobe
[Re: 440Jim]
#2889512
02/17/21 07:20 AM
02/17/21 07:20 AM
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Joined: Nov 2011
Posts: 287
PA
Harry's Taxi 2
OP
enthusiast
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OP
enthusiast
Joined: Nov 2011
Posts: 287
PA
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I have this cam with 1.6 on the inlet using PAC -1916 springs. I ran that cam for years, with 1.5 rockers. Great flat tappet IMO. 150 lbs seat, 440 open is about right. That is a lot of pressure, so I used edm oiling lifters. 0.650"/0.630" MM305S Thanks for responding, I think i'll run the 1.5's initially. I'm now running around that same spring pressures on a previous cam with tool steel lifters and the wear (or rather the lack of it) appears pretty good.
'86 Maple Grove KOS Mopar low qualifier......true street legal with no power adders.
NOS-used when losing since 1940.
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Re: MM 305 lobe
[Re: UKDART]
#2889516
02/17/21 08:15 AM
02/17/21 08:15 AM
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Joined: Oct 2015
Posts: 570
UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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Last edited by rb446; 02/18/21 07:14 AM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990
1971 340 'Cuda, best 11.01@122.8 in 1987
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