BeachBum wrote:
Quote:

Durango_Boy wrote:

Well I approached it like this. I prefer low RPM torque but I also don't want to limit myself to it. I want to have that HP if I need it. My thoughts on that cam were that the 405 is going to be a torque monster anyway...because that's what they do, and that cam would not only play to that trend but it would give me some room to explore if I change in my driving habits.

Thanks so much for the insight.

I then think your set-up is a contradiction so to speak..... Vortec cylinder heads are nice low cost entry level street cruiser cylinder heads, but on a 406, they will really bottle-neck your motor. I think if you stay with the Vortecs, you would be happier with a torque building smaller cam. You might find the following results interesting.

(This is from a test done by Chevy High Performance - January 04 issue)

406 cubic inch motor, hyd flat tappet Lunati cam 230/230 - 480/480, 9.5-1 cr, Vortec Performer Air Gap manifold, Holley 750cfm. Here are the HP dyno results utilizing two different cylinder heads.

rpm.... Vortec 174 cc...un-named 180cc aftermarket
2500......227............216
3000......282............276
3500......350............338
4000......392............401
4500......420............450
5000......428............478
5500......421............489

As you can see, with no other changes to the above set-up, it gave away a little torque down low, but picked up extremely hard up top. The motor on the right peaked at 490 HP @ 5600 rpm, the Vortec motor on the left peaked at 5000 rpm and literally over 60 HP less. As you can see Vortecs are a great cylinder head for low rpm builds.

I think what I am saying, is that in my opinion, you want to definitely make a decision on what your motor is.... torque motor ? or HP motor ?..... and then build it appropriately.... Right now, you're kind of in the middle, you have cylinder heads that are really great for building low rpm torque, yet, you have a cam that wants to run you up to 6000 rpm where the Vortecs will really struggle.

Just my friendly opinion and advise.... in any regards, good luck with whatever your decision is !