Join Date: Jul 2009
Location: Siler City, NC
Thanked 566 Times in 446 Posts
You already have the same exact pistons as in most 7FB and 4MG 3406B engines which are 14.5 compression ratio. But, why spend this money on an engine you won't get much power from? The A engine was never a powerhouse. Sure, you could slam your finger in the door before you drive it, and it would do ok, but that's it.
The pump has small barrells and plungers, and just does'nt push much fuel. The block won't accept a B pump, so the best thing to do is ditch it for a B or better yet, a C model. The reason I would go with a C is for durability reasons. And as far as teflon and ceramic coatings are concerned, don't waste your money.
Find you a good running C model, throw in a set of 10R-1439 cylinder packs. These consist of 14.6 comp ratio steel top pistons. Or you can seperately buy 125-8869 crowns, and 130-0241 skirts. Drill out the holes for the oil cooler nozzles to 7/16 and get the 277-3076 double nozzle oil coolers. Install a set of OR-8785 nozzles, and a 198123 B/M turbo and enjoy the amazing power and fuel mileage. You will push 38-40 lbs of boost, usually 195 water temp, and no higher than 1050 EGT's, and 6-6.5 MPG. All with spec. fuel settings. Turn the FLS and FTS out two rounds and then enjoy installing a 2050 fl/lb clutch.
I have built this combination on 3 of my trucks....one of which is JWAC. PM me and I can give you all the info you need.