This cam too small ??

[331stroker]

Blown 331 with 185 AFR heads v2-sq , the specs are below .. Let me know what you guys think .. Thanks


- INTAKE -

Duration : 282
Lift : 0.496


- EXHAUST -

Duration : 286
Lift : 0.512

LOBE : 112

Duration @ .050 , Intake : 222 Exhaust : 228

[regattacoupe]

I think it's a great street/strip cam. A little bigger wouldn't hurt but it should run really well. What intake?

[331stroker]

what I forgot to add is that those numbers are from a 1.6 r.r I have the 1.7, so my lift is a little bit higher, I forgot the equation on how to calculate it out but its a little bit higher...

[on3 racing]

to calculate you take the life divided it by 1.6 then times it by 1.7

[331stroker]

im using the TFS track heat intake to match my 75mm accufab throttle body

[fanglemeister]

I'll 2nd what the regattaman said, but with one footnote: you don't want to run very much compression with this cam in a blown 331. Keep it down to 9.0 or less, 8.5:1 from dishtops would be just about perfect. If you are planning on running flattops and making like 9.7:1 or slightly more cr, then I would go with something with a little more duration that would bleed off some cylinder pressure. By my calcs, @ 9-10psi at 6k rpm and 8.5:1 CR should get you @ 550-560hp at the crank on pump gas.

[331stroker]

my cr with dished SRS light weight pistons is 8.8.1 .. I got it dynoed it made 516 rwhp with 490 lb tq on chity 91 gas.. The tuner said theres plenty of room for growth w/ the motor, he did a " safe " tune with the car.. The cars peak would drop after 5200 - 5500 rpm, thats my cam .. But for right now im satisfied with my combo, nice street/strip combo.. Im about to buy MM TQ kit w/ there starter box an a new rear end so now I should be able to feel some traction with this car.. But after that new cam with bigger injectors , bigger MAF an an air to water cooler with a 8" crank renegade pulley with a Reichard pulley , I should be well over 560 rwhp .. My original goal with this combo was anything over 500 rwhp so Im happy, goal with the motor 550+ rwhp

[fanglemeister]

There you go then! My net HP prediction was only a few HP shy of your chassis dyno results, depending on what dyno type and auto or manual trans, you are probably right around 580 or so at the crank. I always try to predict output on the conservative side to avoid any potential for disappointment after a part is installed :-)

I am slightly surprised to hear that this grind does not pull all the way to 6k rpm. I'd like to see a graph of your dyno run. Does the HP curve keep going upward until 5200-5500 and then fall off quickly, or does it sort of chatter up and down and hang at the peak HP number for a few hundred rpm before it starts to drop? What rpm did it make peak tq?

EDIT: sorry, what is a MM TQ kit ?