But is it wise to do a simple build (rods/pistons) by simply removing the head? I know working with the engine out of the car is easier, but what if you weren't blessed with the means or access to a wide work area?

I spoke with a shop(won't name names cause I don't want to cause mud slinging) and they mentioned it was easier to do a simple rod/piston build with the engine in the car

 

If you did it that way I would imagine you would do pistons and rods from underneath, removing the lower and upper oil pans. Would you have to remove the heads? I'm trying to think if the upper pan connects to the rear timing cover or not.

This build is assuming you are keeping the stock bore piston size then. No machining required correct?

 

Yeah stock bore size.

Again this is more of a thinking out loud question, as the shop mentioned it's "easier to build" with the engine still in the bay. I'm thinking this was said cause they wouldn't have to disconnect a ton of stuff.

 

Can it be done yes. The rear timing cover can be left in place to remove the upper oil pan, and then work from the bottom. This could be done without removing the heads.

 

I think they are thinking the VQ35 is a 4G63. It shows they aren't very familiar with this car.

 

^I agree. Something doesn't sound right. How are you going to remove the rods and pistons through the top of the motor without disconnecting them from the crankshaft first. Pulling the motor isn't that hard either, so why make a meal out of replacing rods and pistons by leaving it in the engine bay?

 

The simple answer is, No.

 

I wish it was that easy

 

because you can with a 4g63 and i have.

 

Preposterous; nonsensical even!

 

The back cylinders would be hard to reach to unbolt them with the cross member in the way. From what other members said it's a PITA to remove the upper oil pan with the car in place so i would imagine it would be worse to get in there to unbolt the rods.

Seriously it's not that hard to remove the engine on these cars. The whole front end of the car comes off so easy it's stupid to try to work with something in the car. The timing covers will have to come off to get the heads off so that's half the battle right there. Might as well just pull it and make life simpler. The time spent from leaving it in the car and being more difficult would be equal to the time spent to just pull the engine.