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Just some comments after reading this thread that may be helpful. Not trying to be a "know it all", just sharing what I have experienced.

- The Apache heads will fit on a 5.7 block
- Another alternative for good heads is Thitek
- The 5.7 block is a cheaper and more readily available alternative.
- If using a truck 5.7 block you will need to account for the different dipstick location and if using a pan with a dipstick tube you will need to plug the dipstick tube hole in the truck block.
- If using a 5.7 truck block and a 6.1 timing cover and AC you will need to drill and tap 2 holes for the AC bolts in the block.
- To delete MDS just replace the lifters. You can leave the MDS components in place - no need for plugs.
- These engines do not like a lot of timing so be careful.
- Stick with fuel injection and a 6.1 intake for most applications.
- NA or forced induction they can make a decent and reliable HP#

We have a 3700# car, NA, 430ci going 10.0 in the heat and should nick 9's shortly.

We also have a 5300# Jeep, turbo, 370ci going high 9's and daily driven.

These engines are impressive and I can't wait to see when someone really starts pushing them!

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