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Is a Purple cam, standard bore, 340power brake friendly #1244925 06/03/12 07:52 PM 06/03/12 07:52 PM
Joined: May 2008 Posts: 958 eastern, pa. C cudabitten OP super stock
cudabitten OP super stock C Joined: May 2008 Posts: 958 eastern, pa.	Does a 340 with Purple cam, have at least 14-16 inches of vacuum for power brakes? Standard bore with a hone and re-ring.

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: cudabitten] #1244926 06/03/12 07:56 PM 06/03/12 07:56 PM
Joined: Jan 2003 Posts: 4,996 North Pole,New York F formula_s master
formula_s master F Joined: Jan 2003 Posts: 4,996 North Pole,New York	Lotsa purple cams to choose from. Which one?

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: cudabitten] #1244927 06/03/12 07:57 PM 06/03/12 07:57 PM
Joined: Aug 2003 Posts: 279 Northeastern PA F Fanning enthusiast
Fanning enthusiast F Joined: Aug 2003 Posts: 279 Northeastern PA	Which purple cam do you have? http://www.summitracing.com/search/?keyword=mopar%20purple%20cam%20340&dds=1 Last edited by Fanning; 06/03/12 08:00 PM.

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: formula_s] #1244928 06/03/12 07:58 PM 06/03/12 07:58 PM
Joined: May 2008 Posts: 958 eastern, pa. C cudabitten OP super stock
cudabitten OP super stock C Joined: May 2008 Posts: 958 eastern, pa.	Never knew that....I thought a Purple cam was a Purple cam. The numbers are, duration 282, lift 484.

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: cudabitten] #1244929 06/03/12 08:01 PM 06/03/12 08:01 PM
Joined: Aug 2006 Posts: 1,349 warfordsburg, PA dirt pro stock
dirt pro stock Joined: Aug 2006 Posts: 1,349 warfordsburg, PA	probably be ok , any larger like the 508 and you would probably have problems, i have a 440 with the 484 but i dont have power breaks so its just my guess.

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: dirt] #1244930 06/03/12 08:11 PM 06/03/12 08:11 PM
Joined: May 2008 Posts: 958 eastern, pa. C cudabitten OP super stock
cudabitten OP super stock C Joined: May 2008 Posts: 958 eastern, pa.	Thank you, I did call CompCam tech support. Guy there said I should be OK,but I wanted to check with Moparts Guys...

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: cudabitten] #1244931 06/03/12 09:03 PM 06/03/12 09:03 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	14 inches with a 484, probably not.

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: RobX4406] #1244932 06/03/12 09:09 PM 06/03/12 09:09 PM
Joined: Jan 2003 Posts: 7,978 Bethel Ct A AdamR master
AdamR master A Joined: Jan 2003 Posts: 7,978 Bethel Ct	the 284-484 wont make enough vacuum for power brakes. Its 248* @.050" and ground on a tight 108 lsa.

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: RobX4406] #1244933 06/03/12 09:12 PM 06/03/12 09:12 PM
Joined: Apr 2006 Posts: 4,220 West Plains, MO DrCharles master
DrCharles master Joined: Apr 2006 Posts: 4,220 West Plains, MO	I ran the old 284/.484 purple shaft in a basically stock 383 and it only had about 13" at idle.

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: AdamR] #1244934 06/03/12 09:27 PM 06/03/12 09:27 PM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: the 284-484 wont make enough vacuum for power brakes. Its 248* @.050" and ground on a tight 108 lsa. 284/484 is 241* at .050 292/508 is 248* at .050 Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: 70AARcuda] #1244935 06/03/12 09:40 PM 06/03/12 09:40 PM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	What is your goal? I run the Purple shaft 268/272 .450/455 cam in my 340 under a 6 pac in my 81 shorty. I have power brakes. This cam has a sweet lope at idle, good power and the fuel mileage is great. If your after a street can I wouldnt go bigger than the 280/474. I am truckless..

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: 70AARcuda] #1244936 06/03/12 09:45 PM 06/03/12 09:45 PM
Joined: Jan 2003 Posts: 7,978 Bethel Ct A AdamR master
AdamR master A Joined: Jan 2003 Posts: 7,978 Bethel Ct	Quote: Quote: the 284-484 wont make enough vacuum for power brakes. Its 248* @.050" and ground on a tight 108 lsa. 284/484 is 241* at .050 292/508 is 248* at .050 Is that advertised or measured ? I think someone here measure a 484 and a 509 and came up with 248* and 254* respectively.

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: DrCharles] #1244937 06/03/12 10:05 PM 06/03/12 10:05 PM
Joined: May 2005 Posts: 2,295 dark side of the moon D Dougsmopars top fuel
Dougsmopars top fuel D Joined: May 2005 Posts: 2,295 dark side of the moon	I run that cam in my super bee. with initial timing set at 20 w/38 total i have 15 inches of vac plenty for my brake booster. I run the big Voodoo 513/533 in my GTX timing set 21 initial w/38 total that has no problem with power brakes either. They both have poor vac when timing is set low. Both like the higher initial timing.

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: AdamR] #1244938 06/03/12 10:13 PM 06/03/12 10:13 PM
Joined: May 2008 Posts: 958 eastern, pa. C cudabitten OP super stock
cudabitten OP super stock C Joined: May 2008 Posts: 958 eastern, pa.	Quote: the 284-484 wont make enough vacuum for power brakes. Its 248* @.050" and ground on a tight 108 lsa. Thanks everyone.... I'm not sure what these other numbers mean, but it sounds like this engine would need a different cam to be used with my power brakes. I did not buy it yet, but if I do, I guess I need a cam with less than 450 lift. Right? I know very little about this stuff other than I want a stockish 340 in my Cuda and I want to retain my power brakes.

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: cudabitten] #1244939 06/03/12 10:22 PM 06/03/12 10:22 PM
Joined: Dec 2010 Posts: 1,035 Missouri U.S.A. 7 71yelladustr super stock
71yelladustr super stock 7 Joined: Dec 2010 Posts: 1,035 Missouri U.S.A.	Smaller duration is what you are after for more vac. The lift isnt the problem. 392 gen III hemi on E-85 727 trans Dana 60 10.02@134

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: AdamR] #1244940 06/03/12 11:19 PM 06/03/12 11:19 PM
Joined: Jan 2003 Posts: 5,439 So Cal Sinitro master
Sinitro master Joined: Jan 2003 Posts: 5,439 So Cal	Quote: the 284-484 wont make enough vacuum for power brakes. Its 248* @.050" and ground on a tight 108 lsa. There are (2) 284-484 cams.. The older version #P4120231 has significantly more overlap (68) and delivers less vacuum.. The later version #P5007696 has an overlap of 56 and delivers higher vacuum along with better driveability.. Don't use the #P4120231 if you have power brakes.. Just my $0.02..

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: AdamR] #1244941 06/03/12 11:51 PM 06/03/12 11:51 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	Quote: the 284-484 wont make enough vacuum for power brakes. Its 248* @.050" and ground on a tight 108 lsa. Agree... much over 230 to 235@ .050 in a 340, especially with tight LSA, isn't going to make enough vacuum for PB. One member mentioned a lower duration purple shaft that would likley work, there are other options. What are your goals?

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: Sinitro] #1244942 06/04/12 12:37 AM 06/04/12 12:37 AM
Joined: Mar 2010 Posts: 357 Lake Elmo, MN Evil Monkey enthusiast
Evil Monkey enthusiast Joined: Mar 2010 Posts: 357 Lake Elmo, MN	I've got a 284-484 purple shaft in my 360, probably the older version since I built the motor in 1995 (but I'm not sure since I don't know when the newer version came out). My power brakes work fine, but I've got a vacuum reservoir. Without the reservoir, I don't think they would work well at all. 1974 'Cuda 360/TKO 1990 Ram Van 1998 Neon

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: Evil Monkey] #1244943 06/04/12 01:26 AM 06/04/12 01:26 AM
Joined: Jan 2004 Posts: 755 Tempe, AZ L loco340cuda super stock
loco340cuda super stock L Joined: Jan 2004 Posts: 755 Tempe, AZ	I've got the MP484 cam (108LSA version) in a 340 stroker (417ci) and I get about 14" of vacuum. I have power brakes and no issues. 70 Cuda 340 4 speed - now stroked to 416ci (SOLD) 2017 Mustang Shelby GT350

Re: Is a Purple cam, standard bore, 340power brake friendly [Re: loco340cuda] #1244944 06/04/12 08:49 AM 06/04/12 08:49 AM
Joined: Jan 2003 Posts: 7,978 Bethel Ct A AdamR master
AdamR master A Joined: Jan 2003 Posts: 7,978 Bethel Ct	Quote: I've got the MP484 cam (108LSA version) in a 340 stroker (417ci) and I get about 14" of vacuum. I have power brakes and no issues. the 4" stroke makes a huge difference.

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