Upgraded cams without headwork??

Sleepy1 · Mar 2, 2004

After some consideration, I think I have my mind made up that I will keep the car N/A and try to make the best of it. I want to do some cam work (either VT or SHM), but what kind of gain difference will there be between port/polishing the heads versus not? Will I be disappointed without the head work? Do you think I will need a custom dyno tune afterwards? Thanks for the input.

Bone Racing · Mar 2, 2004

get a mild cam and u will be very happy

15rwhp at least

Sleepy1 · Mar 2, 2004

I was hoping to get a little more than that because final cost will be at least $1k.

MrMorden · Mar 2, 2004

Yes, you will need a tune, to get the most power. VT cams have made 25+rwhp on NA cars. I made 51rwhp with HP billet cams on my blower car, with no head work.

'96&'01Stang · Mar 2, 2004

WRXracer · Mar 2, 2004

yeah

you could see like 25 HP but id get the vavles done while your at it too..

Sleepy1 · Mar 2, 2004

Does anybody have any actual before and after dyno graphs? I know there is another thread going on about the same thing, but I am also interested in head work.

WRXracer · Mar 2, 2004

oh

there is something in a mag but most make 50 RWHP if you do everything..

lopey4.6 · Mar 2, 2004

You will definetly need a tune.

Yellow4.6 · Mar 2, 2004

A friend of mine made 298rwhp and 342rwtq w/ Fox Lake stage 2 heads and a stage 1 cam w/ just minor bolt ons. Yes you need a tune! I'd just go w/ a nice stage 1 cam. you'll be happy! If you go w/ a stage 2 then you'll have to change your springs as well.

Sleepy1 · Mar 2, 2004

What kind of difference is there between the stage I and II? Springs are only $189 so really no big deal. After 20k miles the stock ones start to soften up anyways, so replacing them would be beneficial.

Sleepy1 · Mar 3, 2004

On the VT website, it shows dyno graphs only making power above 4-4.5k rpm, while the Comp cams says their effective range is between 2.5-5.5k rpm. Does anyone have some info on where the SHM are effective?

MrMorden · Mar 3, 2004

Sleepy1 said:
On the VT website, it shows dyno graphs only making power above 4-4.5k rpm, while the Comp cams says their effective range is between 2.5-5.5k rpm. Does anyone have some info on where the SHM are effective?

Any time you go with a hot (Stage II) cam on a 4.6L car, it will move the power band up. Our heads only really get flowing well above 3000rpm, and that's where the cam will increase your power by adding lift and/or duration. A mild Stage I type won't move your power band up as much, but it also won't make the same power.

Go with a good Stage II cam and do the springs while you're in there. That way you can move the rev limiter to 6500-6800rpm and get more power at the top end.

Sleepy1 · Mar 3, 2004

By moving the rev limiter up, are the stock pistons/rods going to be okay? This might be a dumb question, but I don't know. Are the chances of spinning a bearing greater? I change my oil every 1k miles (I know that is probably a little excessive), but is the motor spinning too fast at those rpms?

Sleepy1 · Mar 3, 2004

Nobody has any info on this

MissBlondie · Mar 3, 2004

Sleepy1 said:
After some consideration, I think I have my mind made up that I will keep the car N/A and try to make the best of it. I want to do some cam work (either VT or SHM), but what kind of gain difference will there be between port/polishing the heads versus not? Will I be disappointed without the head work? Do you think I will need a custom dyno tune afterwards? Thanks for the input.

Mike... I asked a guy who builds engines for VTEngines this and here was his response...

"No prob Jill,
It's gunna be totally up to his budget, but he will see gains from just a cam swap with stock heads. Our stage 1's gained 22 rwhp peak-to-peak on stock heads and our stage 2's gained 29rwhp peak-to-peak and 50+rwhp at 6000rpm. This was on a completely stock 2000gt! Heads and cams together should get you close to 75+rwhp peak-to-peak, depending on tuneup. Cams will get you the best bang for the buck initially if funds are a concern."

HOpe that may help a little...

Sleepy1 · Mar 3, 2004

Thank you very much. You can always count on Blondie.

Upgraded cams without headwork??

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