Re: looking to make my truck motor and trans reliable
Random cutting out is probably an ignition module getting hot. If it's old replace it. Check the wires at the HEI for damage. I'm not sure when GM installed nylon gear timing chains. Removing and installing a true roller will make an engine last longer. My original 305 failed due to a broken nylon gear.
How long do you plan to keep the truck? Carb combos are great and low maintenace. For optimal performance upgrading to fuel injection is unbeatable.
A 5.3 LS with a 700R4 combo is a nice start. The LS can have both a carb or FI on it. It's just a preference.
Basically, how far and how much money do you want to spend?
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