Cam selection question/ cam and engine experts

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Jul 19, 2009 | 11:14 PM

rham

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From: Murphy Texas

Cam selection question/ cam and engine experts

I am planning my 350 rebuild, I am going to rebuild the shortblock with flat top hyper pistons at around 9.5 to 1 (not building a 383- already spent to many $$$ on rebuilding rolling chassis and still have paint, interior, tires and maybe wheels to go, need to save a buck where I can!).

I am leaning towards Brodix IK180 heads or an iron 180cc head (Dart, RHS etc), Edelbrock RPM intake, Quadrajet and a good set of headers and exhaust. I want to eventually put in a 5 speed overdrive, I have 3.36 gears and using Keislers speed analyzer I will turn 1800 rpm at 64 mph so I can't go too big with the cam.

I want to use a hydraulic roller and I have narrowed down the cam to either a Comp XR270HR http://www.compcams.com/Cam_Specs/Ca...?csid=158&sb=2 or Lunati VDSC-270 http://www.lunatipower.com/Product.aspx?id=1988&gid=289. Both of these have similar .050 specs as the LT4 Hot Cam which is supposed to make 400 hp. From what I can tell the LT4 has an intake closing point of 65 whereas both of these are at 61. The Lunati has a little less overlap than the Comp and LT4. The duration at .006 for the LT4 Hot Cam is 272/ 281 so it is a little longer than the other two.

Would either of these come close to making 400 flywheel horsepower in this build?

Jul 20, 2009 | 06:11 PM

73, Dark Blue 454

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From: Austin TX

I'd say you're in the ballpark with those cams. I know your mind is set on a 350, but Scat has a stroker crank (9000 series, stronger than cast) for $200. Here's one of two dozen sources:

http://www.flatlanderracing.com/scc-cast9000pro.html

That's a little more than what prepping your stock crank will run,..though the new crank may need some prep. Good rods are out there for a reasonable price, or you may can use what you have. And you're already purchasing new pistons.

Give a 383 another look.

Back to the cam. I don't like dual-pattern cams if you're running good heads and exhaust.

More here:

http://www.camaros.net/forums/showth...e+dual+pattern

How about the Magnum 270-HR single pattern?

Last edited by 73, Dark Blue 454; Jul 20, 2009 at 09:30 PM.

Jul 20, 2009 | 07:30 PM

rham

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From: Murphy Texas

Quote:

Originally Posted by 73, Dark Blue 454

I'd say you're in the ballpark with those cams. I know your mind is set on a 350, but Scat has a stroker crank (9000 series, stronger than cast) for $200. Here's one of two dozen sources:

http://www.flatlanderracing.com/scc-cast9000pro.html

That's a little more than what prepping your stock crank will run,..though the new crank may need some prep. Good rods are out there for a reasonable price, or you may can use what you have. And you're already purchasing new pistons.

Give a 383 another look.

Back to the cam. I don't like dual-pattern cams if you're running good heads an exhaust.

More here:

http://www.camaros.net/forums/showth...e+dual+pattern

How about the Magnum 270-HR single pattern?

I have not completely ruled out a 383, depends on what things look like in the next couple of months ($$$). I know thats the easy way to get to 400 hp.

I also thought about the Magnum 270-HR but its .050 numbers are not as good. Do you think that hurts it much compared to the newer cams. Also thought about a custom grind single pattern using Comps xfi lobes- lots of lift and from Summit they are the same price as the in stock ones.

What do you think?
Thanks