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spring pressure for MP 509 cam #667107 04/11/10 06:54 PM 04/11/10 06:54 PM
Joined: Mar 2005 Posts: 1,406 New Jersey, USA Y yella71 OP pro stock
yella71 OP pro stock Y Joined: Mar 2005 Posts: 1,406 New Jersey, USA	Does anyone know what the pressures should be for the mopar 509 hyd? this would be 915 heads with stock valves. 71 challenger convertable, 64 sport fury 383 ci with factory air 99 sebring convertable 89 CTD pup

Re: spring pressure for MP 509 cam [Re: yella71] #667108 04/11/10 07:07 PM 04/11/10 07:07 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	I used these ?? P3690933 http://chucker54.stores.yahoo.net/mopbrbhipupt1.html http://chucker54.stores.yahoo.net/valvesprings2.html

Re: spring pressure for MP 509 cam [Re: Dodgem] #667109 04/11/10 08:01 PM 04/11/10 08:01 PM
Joined: Mar 2009 Posts: 2,457 Sydney,Australia tex013 top fuel
tex013 top fuel Joined: Mar 2009 Posts: 2,457 Sydney,Australia	i just used the factory recommended valve #P5249848 in a 906 head Tex New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive

Re: spring pressure for MP 509 cam [Re: yella71] #667110 04/11/10 08:09 PM 04/11/10 08:09 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	I used the MP 933 spring myself, as it was the recomended spring back in the day by MP. Its numbers were 110 lbs @ 1.900 and 333 lbs @ 1,400 Back when I bought them they were advertised and both .510 lift and .520 lift. I used them at .542 lift with my 1.6 rockers. I now see Mancini lists .500 lift In Hindsight I wouldnt buy them again as they limit you to your max lift. For the same Money you can get a spring that will allow lifts up to .600+ and still get the pressures that will work great for that cam and allow you to grow to a bigger cam without having to buy new valve springs all over again. mike

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