JES_LS
Dedicated LVC Member
well if the blocks are the same then all you know is that the 4.4l is a much larger bored and stroked version of the 3.9l, then it is possible.
as for the motor having that much of an overbore compared to the 4.2/4.0/3.9 bores, there is not much worry.
I'm sure that the 4.4l block is either designed to take a larger cylinder sleeve or it has a different casting core designed to allow for the larger standard bore.
I would not want to try and bore an 3.9/4.0/4.2l block out 0.10" unless I was sure that I had sleeves for it and that the block was designed to accept sleeves from the begining.
anyway, if the 4.4/4.2 share the same block height and are just taller deck versions of 3.9/4.0 block then the LS heads should bolt on to the block and the lower intake could be sectioned and stretched to fit the block. The timing cover might need some massaging to fit, but it would all seem do-able.
then you start looking at can the trans take the power, will the rear hold up, and can I get it all under the hood?
Hmmm.
as for the motor having that much of an overbore compared to the 4.2/4.0/3.9 bores, there is not much worry.
I'm sure that the 4.4l block is either designed to take a larger cylinder sleeve or it has a different casting core designed to allow for the larger standard bore.
I would not want to try and bore an 3.9/4.0/4.2l block out 0.10" unless I was sure that I had sleeves for it and that the block was designed to accept sleeves from the begining.
anyway, if the 4.4/4.2 share the same block height and are just taller deck versions of 3.9/4.0 block then the LS heads should bolt on to the block and the lower intake could be sectioned and stretched to fit the block. The timing cover might need some massaging to fit, but it would all seem do-able.
then you start looking at can the trans take the power, will the rear hold up, and can I get it all under the hood?
Hmmm.