99_gtx

Im kinda stuck with what i want. I have a 99 gt with a few mods but my friend is going to help me buils an engine to drop in it. He builds mostly chevy motors but he suggested a 5.4L. I looked into it and it almost seems like too much money and effort than its worth.??? I want around 500 rwhp, maybe alittle less but no more. Ive been looking into the moded 4.6's and 5.1's but i dont know what would be the best and or easiest rout. Maybe even a moded cobra engine? Im going for a street setup, not drag so any opinion is welcome. Thanks to all.

callmecobra

5.4l navigator motor, stroke it to a 6.0, twin turbo it, own everything on the road.

mdvaldosta

Don't stroke a 4.6 really its not a good idea. A big bore kit for a 4.6 would be great - it unshrouds the valves and really helps the engine breath - as well as more cubes. BTW - 500 rwhp is easy to get with a built bottom end 4.6 and 12 - 15 lbs of boost.

99_gtx

Sounds nice but probably too much power for a daily driver. I think i want to go with a SC. Can i get to 500 rwhp with a SC 4.6?? What would be the benifit of a 5.4 over 4.6? Bare with me, im learning

99_gtx

Also its a automatic........ I know, i know, but for the price and what it had i had to take it. My friend also suggested a manumatic trany??? Dont know too much about all that but my auto is still awsome. What do you guys think i should od in that area as well?? Keep in mind day to day driving/ rice stomping. All this will go with my 5 link suspencion and 3.73 gears i already have.

mdvaldosta

Just get a shift kit, higher stall computer, and have your ecu recalibrated and that auto will shift faster and harder than a stick.

99_gtx

wow, thats it? Do you have a link on where i can find a good one? I know alot about these cars exept for the internals. Ive done alot of outside mods, but not realy the engine yet. If im not misteaken ill need forged internals for this right??

jdaniel

Hey MD... What does the big bore kit consist of and whats the cost? Never heard of that myself. I was always told it was a waste of time to stroke OR bore a 4.6.

99_gtx

so i can get to 500 with what i got or do i need to upgrade to a 4v with forged internals and a SC? Once again thanks

mdvaldosta

Its a waste to stroke them because they have a pretty long stroke already and you will loose revving ability, not to mention the small bore shrouds the valves and will hurt higher rpm performance - stroking often times will increase torque on a stock headed 4.6, but I've heard of it actually decreasing hp.

Now a big bore kit on the otherhand is phenominal for a 2v. The problem is that the cast iron blocks can't be bored more than .030" over. With that being said, you'd have to go to an aluminum block for the big bore kit, and they overbore the aluminum block and put sleeves in. 2v GT's all have iron blocks, so it would require a block replacement to big bore.