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347 build, Cam selection? 

 

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 Post subject: 347 build, Cam selection?
Posted: Tue Nov 01, 2011 6:31 pm 
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hi guys, I'm currently putting together a 347 stroker and i'm wanting to upgrade the cam, the engine is going into my daily driver (EB wagon) so i'm not after anything over the top, something mild. any suggestions would be good, cheers.

 

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 Post subject: Re: 347 build, Cam selection?
Posted: Tue Nov 01, 2011 6:50 pm 
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 Post subject: Re: 347 build, Cam selection?
Posted: Tue Nov 01, 2011 7:38 pm 
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Use nice shiny cam with some bumpy bits on it, and also some smooth bits in between, and a hole in one end.

If you want any useful advise you'll need to detail your engine and driveline combination.....

 

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 Post subject: Re: 347 build, Cam selection?
Posted: Tue Nov 01, 2011 7:54 pm 
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ok 347 stroker GT40P Heads, Explorer Intake Manifold, 65MM TB, 70MM MAF, Pacemaker PH4000 Extractors, auto trans. is that enough info?

 

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 Post subject: Re: 347 build, Cam selection?
Posted: Wed Nov 02, 2011 12:07 am 
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If using GT40P heads, choose a cam that provides lots of duration to really fill the cylinders and install some roller rockers to get as much lift as you can out of the 40P heads.

 

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 Post subject: Re: 347 build, Cam selection?
Posted: Wed Nov 02, 2011 9:20 am 
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Vic wrote:
If using GT40P heads, choose a cam that provides lots of duration to really fill the cylinders and install some roller rockers to get as much lift as you can out of the 40P heads.



That doesn't really suit a DD wagon with an auto does it? Find the biggest cam you can & bang it in the hole...

Crane 2020 or similar.

 

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 Post subject: Re: 347 build, Cam selection?
Posted: Wed Nov 02, 2011 6:13 pm 
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Look for a lobe separation around 114°, it will help keep the ecu happy. Are you running the standard converter? If yes then duration at 050 about 220°, if you're running a 2500 stall converter try around 224-6° at 050. Roller rockers as Vic says and make sure the valve train is upgraded from the rubbish factory retainers & springs. Check p/v clearance, usually OK if under 500 thou lift. With stock GT40P heads there isn't much point going above 500 thou anyway. Intake, TB & MAF are too small for a 347 really, but I'd go 70mm TB and 80mm MAF on stock-ish GT40P heads and intake. 30lb injectors. And a piggy back chip on your ecu to run the bigger injectors & MAF. Check fuel pump keeps up under load.

 

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 Post subject: Re: 347 build, Cam selection?
Posted: Wed Nov 02, 2011 6:51 pm 
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 Post subject: Re: 347 build, Cam selection?
Posted: Wed Nov 02, 2011 7:30 pm 
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You have a 347 not a 302, so I'd go bigger along the lines I suggested. That Lunati is very similar to a stock 220kW AU3 Tickford XR8 cam (so it's quite tiny), but has 50 thou more lift and less lobe separation. Look for 218-220 at 050 INTAKE and 114 lobe separation. Keep lift around 500 thou. Run standard rockers to start with. If you're happy, replace with 1.6 roller rockers. If you want a bit more power, go to 1.7 roller rockers. Select springs etc to cope with advertised cam lift x 1.09 minimum.

 

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 Post subject: Re: 347 build, Cam selection?
Posted: Wed Nov 02, 2011 8:07 pm 
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anything here that you would recommend?

https://www.lunatipower.com/Category.aspx?id=69

sorry to be a pain, I just have no clue about cams.

 

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 Post subject: Re: 347 build, Cam selection?
Posted: Wed Nov 02, 2011 9:19 pm 
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236@ 050, 500 lift yeah ok but you dont have toss over lift. get the springs and retainers factory rockers will be fine.

 

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 Post subject: Re: 347 build, Cam selection?
Posted: Thu Nov 03, 2011 12:18 am 
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sexyr6 wrote:
anything here that you would recommend?

https://www.lunatipower.com/Category.aspx?id=69

sorry to be a pain, I just have no clue about cams.


A mate of mine just had one of these eat the cam gear just like poxy -8 comp ones.
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 Post subject: Re: 347 build, Cam selection?
Posted: Thu Nov 03, 2011 12:39 am 
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BOTTLEDUP wrote:
Vic wrote:
If using GT40P heads, choose a cam that provides lots of duration to really fill the cylinders and install some roller rockers to get as much lift as you can out of the 40P heads.



That doesn't really suit a DD wagon with an auto does it? Find the biggest cam you can & bang it in the hole....

I do and it runs fine.

 

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 Post subject: Re: 347 build, Cam selection?
Posted: Thu Nov 03, 2011 5:38 pm 
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sexyr6 wrote:
anything here that you would recommend?

https://www.lunatipower.com/Category.aspx?id=69

sorry to be a pain, I just have no clue about cams.


510A3LUN looks close to me. But check out some other manufacturers as well. Also, talk with the tech-line and explain your parts combination and the type of results you want and see what they recomend

 

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 Post subject: Re: 347 build, Cam selection?
Posted: Fri Nov 04, 2011 9:38 pm 
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http://forums.corral.net/forums/5-0-5-8 ... motor.html

 

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