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Old 04-30-2008, 08:25 PM   #1 (permalink)
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what cam for 347?

Iam building a 347 stroker, i have a b303 cam already. Is this going to be enough cam for this motor or would i see a big difference in power if i went with a different cam. This motor will have twisted wedge heads and a parker funnel web with a 650 mightydemon and a occasional 100 shot of juice. thanks for the help this is my first stroker build!
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Old 04-30-2008, 08:33 PM   #2 (permalink)
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Re: what cam for 347?

First off. the funnelweb is a high RPM race manifold. If you do not want to rev your engine up to at least 7500-8000. that is the WRONG manifold for you.How much compression does it have. What RPM range do you want to run at. Do you weant a solid roller camshaft. From your post, I will assume that yoou have no experiance at this.

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Old 04-30-2008, 08:49 PM   #3 (permalink)
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Re: what cam for 347?

No not very much experience, i have only built two of my own 302s and one 306 for my brother. They all ran well and made decent power for what they were, iam still learning alot, but i luv it. The kit is a scat kit with all 4340 forged internals and flat top two valve relief 10:1 pistons. I would like a rpm range of 2500-7500rpms. I thought 7500 was high enough because it is a stock 88 2bolt main block, but i did put a support girdle on it. It is a roller block so iam looking for a roller cam. I would like to try to get by with the cam i have because it has low miles on it but you would know better than me thats why i ask!!
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Old 04-30-2008, 09:37 PM   #4 (permalink)
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Re: what cam for 347?

That cam is a very mild hydraulic roller, and it will NOT make power even to 6500. let alone 7500. It is a twenty five year old design made for a 302 size motor. VERY BAD CHOICE. There are not many hyd rollers that can run up to 7500 RPM. Maybe you should change your mind,

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Old 05-01-2008, 04:47 AM   #5 (permalink)
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Re: what cam for 347?

I ran a B cam in my 93 for a long time. Great little street cam. But it ran out of steam at about 5500. Your set up sounds like you need a nasty solid roller.
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Old 05-01-2008, 05:59 AM   #6 (permalink)
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Re: what cam for 347?

Thats what i figured! Does any one have any suggestions? I dont want to have to worry about valve to piston clearance. Thanks for the help.
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Old 05-01-2008, 06:27 AM   #7 (permalink)
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Re: what cam for 347?

IMO, there isn't much reason to spin a 347 stroker to 7500, especially if it's on nitrous. With that bore and stroke ratio your peak HP is going to be right around 6000 even with a mildly radical cam. This motor is more of an upper midrange torque motor rather than a high rpm screamer. With the Trick Flow stage 1 or stage 2 cam, your Twisted Wedge heads, the forged 347 flat top bottom end, Edelbrock Torker manifold, a 650 DP carb, full length headers, shifting it at 6000, in a chassis that is properly dialed in, you will be well into the 11 second range on motor and maybe even high 10s on nitrous (with good traction). The point is you don't need to spin that high rpm to make a 347 stroker go real fast.

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Old 05-01-2008, 07:20 AM   #8 (permalink)
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Re: what cam for 347?

I would run something along the lines of a Com 282, with a Vic JR or RPM Air Gap. My combo puts me in the mid 11's on motor and mid 10's on nitrous. My engine makes peak power at about 6500 RPM and I cross the traps at 6800 in the 1/8 and 6400 in the 1/4. Tons of power and still very streetable with my hydraulic roller setup.
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Old 05-01-2008, 07:36 AM   #9 (permalink)
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Re: what cam for 347?

Quote:
Originally Posted by cahorne View Post
I would run something along the lines of a Com 282, with a Vic JR or RPM Air Gap. My combo puts me in the mid 11's on motor and mid 10's on nitrous. My engine makes peak power at about 6500 RPM and I cross the traps at 6800 in the 1/8 and 6400 in the 1/4. Tons of power and still very streetable with my hydraulic roller setup.
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Old 05-01-2008, 01:10 PM   #10 (permalink)
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Re: what cam for 347?

Thanks
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Old 05-01-2008, 08:11 PM   #11 (permalink)
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Re: what cam for 347?

Your B303 may be just barely enough cam if you go with 1.7 roller rockers. However, if you stick with the hydraulic roller cam, you can expect upper RPM range to be around 6200-6300 without special attention to valve spring pressure. An Edlebrock RPM Air Gap, Weiand Stealth, or small volume single plane would work good. 650 DP carb is a good choice.
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Old 05-02-2008, 06:36 AM   #12 (permalink)
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Re: what cam for 347?

Need more info. Calculated compression? Auto or Manual? If auto, how much converter? Rear gear ratio/ tire diameter? Power brakes? Intended use? Etc. etc. etc... Nobody can give a decent answer w/o this info. The only thing I can say is that your head and intake selection is going to require a much more aggressive cam than the B.

347's can handle a lot of cam and still be very streetable. The Ford Racing cams will leave you wanting more, especially the B, E, and F. Old technology and conservative profiles, the engine will most likely underperform.

IMO, maximize your investment and contact the cam companies directly. Fill out a build sheet and follow their recommendations. Once the cam has been selected, don't change the combo w/o finding out if the cam will still be optimized for the engine. An extra $50-100.00 will generally get a custom cam that will outperform the off the shelf grinds both in performance and street manners. Even if you don't go custom, take the time to talk w/ the cam company. Chances are if you don't you will be leaving power on the table.
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Old 05-03-2008, 01:47 PM   #13 (permalink)
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Re: what cam for 347?

If you didnt know already, BIGJOE is the legendary Joe Sherman. Hes forgot more than you or I will ever know.

Have BIGJOE select a cam for you from his arsenal at comp cams. Thats what i did.
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Old 05-03-2008, 05:39 PM   #14 (permalink)
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Re: what cam for 347?

Same here. Joe steered me in the right direction too.
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