mericmm

I want to up the power on my 07 GT, and I've looked at a coyote swap, but the cost is an issue. I'm looking at boring my cylinders to 304ci and making my 4.6 to 5.0 how effective/safe is this?

Dino Dino Bambino

You could rehone the cylinders +0.002" and add a Kellogg 3.80" stroker crank to increase displacement from 4601cc (281ci) to 4942cc (302ci). Do you want to keep the engine N/A or add forced induction?

mericmm

N/A. Maybe In the future but I’m on a budget and this is the main thing I want to do

Dino Dino Bambino

If you're planning to add FI on the stroker later on, you'll need pistons with a compression ratio about a point lower than the ~10.5:1 that you'd use on a N/A set up.

flash_xx

I think he wants to bore, not stroke the engine to keep costs down. I don't know if the aluminum block is thick enough for this.

Dino Dino Bambino

I believe the maximum safe overbore on a 4.6L aluminum block is 0.040". However on a FI engine, you'd want to preserve as much cylinder wall thickness as possible so going that high wouldn't be a good idea.
You could resleeve the block to allow the use of 3.70" pistons but that would be a very costly exercise.

danzcool

$1500-$2000 and that's only sleeves and machining.

flash_xx

There's simply no cheap way to make real power on these engines. Supercharging+reliability=forging, Nitrous+reliability=Forging, N/A power adders like cams, headers, etc +reliability= almost no power+lots of money down the drain.

The more I look into it, the more a 2011+ car makes more sense than building up a 3V.

mericmm

Well, I've been looking at going to an 11+ car. But, selling my current car would be a problem.

Dino Dino Bambino

If you're happy with 300-310rwhp you could just do the stage 1 bolt-ons (CAI, CMDPs, UDPs, midpipe, tune) that I've done, upgrade suspension/brakes/tires, call it a day, and have fun with it.