What will these mods do?
 

In my neverending persuit to perfect my ride to how I exactly want it, I'd like to know what I can expect by swapping gears to 4.10 and swapping the stock pistons to flat tops?

I'm unhappy about my low end torque and I think the 4.10s will help with that. It seems that I have to be over 4000 RPM to get the car going very fast. I went with 3.73 because some people here said that it makes 1st gear useless.

The flat tops will bump the CR from 9:1 to 10.3:1 or so. So that there will give me some extra HP. I'm guessing TQ will go up too.

Also, can you make a good guess how my curves will look with these mods please? Will both curves just go up? Will I end up with a dip at the higher RPMs?

Here is a link to my current dyno graph:
http://www.corral.net/forums/showthr...hreadid=198162

Here are my mods:
98 GT
-Steeda: U/D Pulleys, Pro Plug Wires, TriAx, Double Adjustable Upper Rear Control Arms
-FRRP: Ceramic Coated Shortys, 3.73s, Heads, Intake, Windage Tray, 24# Fuel Injectors
-Bassani X w/cats and catbacks
-SHM: GT Stage 1 Cams, Custom Shaved Billet Flywheel
-Pro M 80 MAF and filter
-Holley 155 Fuel Pump
-Autologic Chip

Thanks

4.10s may help, but don't expect a night and day difference from 3.73s....

To be honest, the FRPP roots-type blower may just be the ticket for you, although the feeling I get is that you're wanting to stay NA....

That's right, I'd like to stay NA. I paid $5800 for the intake and kit so I'd like to keep the intake. Plus, with a blower I'll have to get new injectors, MAF, fuel pump and internals. I heard that you get a 15 RWHP increase for every CR point increase NA.

Staying NA...

Might want to look into a stroker kit...

http://www.seanhylandmotorsport.com/stroker.html http://propowerparts.com/Modular/stroker.htm

:D
You're on the ball. I can't increase the bore because of the iron block and I heard that increasing the stroke isn't good for 4.6s. Someone said that the 4.6 already has too long of a stroke for performance. What do you figure hammer?
Can the iron blocks be bored? Some people in another forum said you can't bore an iron block??