tinman

Could anyone tell me about what the cam duration @.050 should be. I know that I can use more than a 302 but how much more. This 347 will be carbed and used with a C-4 trans in a '67 Fairlane, mostly street driven.....

roundman

for what it's worth, the FRPP crate engine 347 uses a cam with 232 degrees duration on the intake @ 0.050 lift and 240 degrees on the exhaust with .563" lift on the intake and .584" lift on the exhaust. this engine is rated at 450 HP @ 6,000 rpm and 400 ft-lb torque @ 4,900 rpm with a Holley 650 carb.

me alot fast than u

and that is a large cam...a 3500 stall with be needed!

tinman

I don't see having a problem with a 3500 converter, it just that when you get past there that they get expsensive.

me alot fast than u

well a good 'vertor that can mulitiply torque is expensive

tinman

I know about converter prices because of my 25+ years fooling with big block Mopars. Folks really don't seem to know (in contrast) how much more reasonably priced a lot of the 5.0 equipment is........

me alot fast than u

no sh it......I miss my bbc[]

83GT306

Is that a solid or hydraulic roller cam?

I was thinking on a Summit Racing 347 kit for my non-roller block '83 5.0HO that's already bored to 306.
I'm sure I'll need to up the duration @ 0.50 than where I am now...just a flat-tappet hydraulic at 218 @ 0.50, .488 lift.
Duration will also depend on compression ratio...I'm running around 9:1 compression with a 110 LSA right now.
If I keep the same heads with the 69cc chambers, the kit will put me around 9.5:1 compression...it says 10:1 compression with a 64cc chamber.
More compression needs more duration or more overlap(tighter LSA) to stay out of detonation without backing off the ignition timing.

With a non-roller cam, I'm thinking I'll need atleast 230 @ 0.50 with a 110 LSA, and whatever lift comes with that, but no more duration than that unless I mill the heads to get a 64cc chamber.

tinman

Check out other places than Summit for your 347 kit. Other places sell the same stuff for much less....... Hate to say it after doing usiness with Summit for nearly 30 years but they seem to have high prices, sloppy service and the vast majority of the stuff in the book nobody really needs....

roundman

it's a hydraulic roller cam in that FRPP 347 stroker motor.
why don't you give Comp Cams a call and talk to their tech guys about what you are building and let them make a cam recommendation for you, these guys are real pros when it comes to selecting a cam for a specific application and they can make you a custom grind too is that's what will work best for your setup. you might also want to consider converting over to a roller cam with a small mod to the block depending upon how much power you're trying to make.