Street 440 Custom Cam Idea

[outlawse]

Guys:

I plan on getting a custom grind cam for my 440 after talking with a Comp Cam tech concerning my street 440 with power brakes.  He told me as long as the overlap stays around 54 - 57, the brakes should be very nice.  He also taught me how to calculate overlap and such.  I made a excel sheet with a calculator for cam specs and came up with the following:
                                         
Cam A = 280 / 288   0.509   114      56   2000-6000    My Specs
Cam B = 274 / 286   0.509   112      56   2000-6000   XE274H (112 LSA & .509 Lift

Which cam would be the better street performer ?  Alittle less duration but tighter LSA (112 vs 114)  OR more cam duration and wider LSA ??   

Both cams have the same amount of overlap (56).
Both cams have a .509 lift.  (Tech told me the stock 906 heads magic number is around .510 for flow)


Thanks... John

[Chryco Psycho]

I would use the 114* cam with manifolds & the other with headers

[outlawse]

The car has Hooker Super Comp headers. NO manifolds.

[moper]

What is the first cam's duration at .050?

[outlawse]

I am not sure...

The XE274 is 230 / 236

[moper]

I can't find the lobes he suggested in the lobe catalog.. So I'd have to say XE274 as it's a known quantity. But I am not sure it will run your power brakes. Maybe post the rest of the build info, and be detailed.

[AMXguy]

I liked the Ultradyne 288/296  .485 in .507 ex so much i'm putting the same cam in my Super Bee. not a ton of vacuum but even with the six pack plenty for power brakes.

[outlawse]

AMX:

What was the LSA of that cam ? 

The cam should run my power brakes.  The XE268 has a overlap of 54, the XE274 on the 112 LSA drops the overlap to 56 which should be fine.

[HP2]

They are so close in spec I don't know that you'll "feel" a big difference in performance. Choice would depend on compression ratio and how close you are to detonation. The longer duration will tolerate a hair more squeeze in the chamber.