Engine Build Thread

[bullitt5897]

Originally Posted by elliotty

I think there have been a few GTM customer vehicles with the stroker motors as well. I am mostly interested in how that would affect torque and turbo spool. I am guessing I might need to upgrade the GT28s to something larger to really utilize the increased displacement. Any thoughts?

DIGItonium - I think you could manage heat well with an upgraded radiator, which for reliability reasons, I would probably want to do if building the motor.

Being one of the stroker kit owners:

The larger displacement increases the exhaust gas flow. What you have to take into consideration is what turbo or SC'er is the correct size for the displacement. I am running two GTX35R turbos on the 4.5L and it has a similar spool response as the GT28's did on the stock motor. check the video below at 53 secs in you will see my low boost setting on the stock intake manifold. This should give you an idea of what a proper sized turbo to displacement should look like.


With the stroker kits if you go 4.2L you will not have to sleeve the block. However, with the 4.5L you do and this comes with the expense of much more HEAT!!! We had to go with a full race radiator to make it manageable. I still have to talk to Sam to see if there is a way to save my A/C on my build. I believe he removed the A/C compressor so I will need to find a way to squeeze that bugger back in between the cooling mods.

A 4.2L you could get away with the CSF radiator and I highly recommend it! Great Product and Great Customer Service!!!