I would think front main. Pull off the top timing cover and see if you can look down to it.
If you lost a bunch of oil the bearing with the least amount of oil flow is going to take a shit first.
Does the auto trans cooler ports have fitting attached to the radiator? They could just need tightening. THo a new koyo stock replacement is like 100 maybe a little more from dm.
Are you using the stock wiring?
If so that will not work as inj is batch fired in 3 pairs and coils are sequential.
Also with stock coils your going to have a very hard time running batch on them from what I have read.
The crank is 12 tooth no missing teeth and the cam is 1 tooth only.
Normal idle, cruise, and light throttle is usually around 14.7.
Boost with stock ecu is usually in the 10's or richer. Tuner want to be around 11.5-11.8ish.
You can run stock springs with 264 but with 272 you need to change springs and retainers and best to switch to shimless buckets.
Stock head bolts are fine. But if your going for big power its best to change them.
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