dyno number 331

[90lxcoupe]

COMP Cams - Cam Details

i think your cam should look somewhat like that, i have this exact cam in my car and the drivabilitly is good, it dosent buck at low rpm's, and makes great power everywhere

 

[KamiKaziDK]

There's a guy in the 94/95 forum with a 331 running 185cc patriot heads, x cam, gt40 tubular, 24 lb injectors, STOCK maf, 70mm tb, that pulled 321hp and 374 ft/lbs with 12.7 a/f ratio. So on a combo that isn't as good, he made 15 more hp and 23 ft/lbs more torque.....there's something wrong with the tune or something,

 

[Bullitt95]

i am al ittle diappointed with these numbers i think the intake is killing me?

The torque is pretty good but your 331 has a bad case of asthma and the primary cause is the Cobra intake. You have a 210cfm intake which is choking off your 260cfm heads. You could go for a Holley Systemax II instead. It'll definitely add more HP at the top end with minimal TQ loss lower down. Add a 75mm TB, 80mm MAF, retune the chip, and you should be golden.

 

[Tanus]

The torque is pretty good but your 331 has a bad case of asthma and the primary cause is the Cobra intake. You have a 210cfm intake which is choking off your 260cfm heads. You could go for a Holley Systemax II instead. It'll definitely add more HP at the top end with minimal TQ loss lower down. Add a 75mm TB, 80mm MAF, retune the chip, and you should be golden.

+1, holley intake and a bigger cam would definitely jump those numbers big time

 

[from6to8]

i am al ittle diappointed with these numbers i think the intake is killing me?
tell what you think

what numbers lol?

 

[90sickfox]

My 331 made 423hp on the engine dyno. Ported 170 heads and ported systemax intake. Who knows if the numbers were inflated. It was done by the engine builder....who also used cheap gaskets. It's turbo now and not dynoed.

 

[from6to8]

My 331 made 423hp on the engine dyno. Ported 170 heads and ported systemax intake. Who knows if the numbers were inflated. It was done by the engine builder....who also used cheap gaskets. It's turbo now and not dynoed.

Rw or fw?

 

[Mustang5L5]

OP hasn't been back to the site since 2013.

 

[from6to8]

OP hasn't been back to the site since 2013.

What's the general rule of thumb I know I'm going to do a 331 stop block and I have a few intakes that I would like to run and a few heads that I'm thinking about. Do you pick the heads first and then match the cam?

 

[Mustang5L5]

Cam last. Pick your heads, displacement, intake and then figure out how you are going to drive the combo. Race car? Daily cruiser? Cam selection will change. Ideally you wait for the end because if you have your heart set on a 331 and then something changes, that would affect your cam selection. Leave it to the end and then.

 

[Rcdgl]

My carbed 331 with afr 185 heads made just over 400/400 on an engine dyno. Comp roller, eddy performer rpm, 600 cfm vac secondary holley.

 

[from6to8]

My carbed 331 with afr 185 heads made just over 400/400 on an engine dyno. Comp roller, eddy performer rpm, 600 cfm vac secondary holley.

Damn so only around 320 to the wheels

 

[AeroCoupe]

So did it meet your expectations or ???

 

[Rcdgl]

The 331 in the above post has run a high 740 eighth mile, na. So I am happy with it. Been down for flying and now rust repair for two years.