Proven cam for a 383 stroker.
I think its a tad big for a stock shortblock 350. Prob needs 6500rpm in a stock lt1.

 

It is too large for a 350, but if you want that size cam you better have gears (and stall if auto) to accomodate. Using stock gears at least on a manual car will make 5th and 6th gear useless.

 

 

Those gears/stall would be marginally ok for the street, but ideally you'd want a larger stall and steeper gears.

 

 

should make 400 to the wheels with the right tune. 3.23 are a little tight for a rear gear. 373s with the A4 should be nice. I would do gear swap first and keep the 2800 stall in it to see if "your" driving use like it with that stall. You can swap in a higher stall if you feel you need to based on your driving use

 

More compression (at least 11:1 SCR) and you'll be fine with that cam. But if your compression remains 'stock-ish', throttle response will be sloppy at lower RPMs.

KW

 

 

You'll be just fine at that compression. With the the cam being in a stroker you'll have adequate torque down low as well.

 

OP

posted this earlier but it didn't stick

The XFI has quick ramps. Don't use the Comp 918 Bee Hives as the cam card notes or you could become a member of the 2 piece spring club...ask me how I know.

Lloyd recommended, and sold me, the Lunati kit. Very nice spring and works very well with my XFI

 

That 280 cam can make 500fwhp in a 383.
I have a 223/231 .580 .593 112 lsa cam in my 383. Smaller than your xfi 280 but i have Lloyd Elliot ported trickflows that flow 290cfm, so i should be near 500hp.
i have 410 gears and love them but its through a manual.
Too bad you dont have specs on your ported heads so you could have a custom cam matched too them, regardless that 280 cam is a proven performer.

 

Yeah I dont know what they flow exactly but the ports were touched up a little but not much.. but i do know that there were bigger valves put in (2.02/1.60) Ferra 5000 series valves.

 

The only problem I see is that his heads AREN'T ported they just have bigger valves so the seats were changed but no bowl blending or porting was done.

 

Yeah i wasnt too happy with the ports themselves.. and I know Lloyd could've ported them but i decided to just use nitrous for more hp. But the heads were ported a little bit..

 

this was the only porting done.. makes me a little mad that there wasnt much of anything ported but at least its better than stock. I know i wont make 400 rwhp with this but i guess ill just get to where i wanna be with nitrous haha

 

I haven't owned a 350ci LT1 since 1997. I have had several cars with 383's, a 396 and a 398ci......with several cams and several compression levels.

No…...strokers do NOT magically/automatically mean more torque. And if a person builds a stroker and then over cams that engine (due to the use of stock-ish compression or just plain using too big of a cam), it will perform sloppily/sluggishly at lower (<3000) RPMs.

IJS.....having been there, done that.

KW

 

Cool. My 396 has 11.1 CR. Had a 248/250 112lsa .650/.610 and with 3.73 gears and it behaved much like stock.
This is in 5th gear:
Had aluminum rockers too!

Mathematically a stroker will make more torque than a stock CID engine. The question is whether or not it will produce torque to its fullest potential in a given RPM band with a given heads/cam/CR.

My prediction on the OP's setup with those heads is it'll make real steep torque and power ramps at low rpm and peter out long before it should.

 

Yup back at the shop, I would look at head flow specs vs cam and many times go with a smaller cam and make more HP and drive ability and even fuel mileage would be greater, as said too much cam for supporting mods will yield less power than with a smaller cam.

 

do you think its not going to perform well..? im just really curious on what kinda number im gonna put down and how its gonna drive on the street. im also gonna be shifting at 6600 rpms..