This engine project will be a
514 Stroker topped off with a Dyers 8-71 blower. We
will be building this completely and running it on our dyno.
Due date is mid-March where it will find its home in a
jet boat.
The first steps we take with
any engine is stripping the block bare. We then bake the
block and caps in an oven at 700 degrees for 2-1/2 hours.
This process makes grease
and paint turn to dust. The block is then blasted with
steel shot. This cleans the block and gives a nice cast
look. The baking and blasting helps a little in stress
relieving also. After the
block has been cleaned it is magnetically checked for cracks.
Pictured are the splayed
caps that will be used in this
project. They are a flat bottom cap
and require machining of the block to fit. The next
picture shows the machining
process used to machine the block for the flat bottom cap.
We are installing the 4-bolt caps on the center 3 only.
Once the block has been machined, the main studs are installed
and the caps are pre-fitted.
At this point the block is then drilled and tapped for the
splayed bolts. We align bore the main caps after all the
studs and bolts are torqued in place. We leave about
.003"-.005" material for the final align hone.
Picture shows the process
at this point. As you
can see the caps are much larger, extending out to the
oil pan rails. The splayed bolts have a lot of material
to be threaded into at this area. The next step is to
resurface the block. We measure the block
to confirm our starting point. We will be shooting for a
10.300" deck eight.
This block required .017"-.020" of machining.
The picture shows the difference in the end to end
height. Most blocks
are off bank-to-bank and also end-to-end.
In one of the accompanying
pictures you will see a thrust bearing and washer set. For this application we have machined the cam gear
to fit the bearing between the gear and the thrust plate.
We have seen in some of our race engines that the front of the
thrust plate is usually worn severely. Ford cams have
one bank of lobes tapered one direction and the other bank
tapered the other direction. This
should keep the cam pretty centered, but we feel the cam gear
and oil pump is causing the cam to "work" its way
back into the block. Using a high volume oil pump just
makes this condition worse. We then will "massage"
the oil passages and machine some extra passages to get more
oil. The main bearings have small oil slots. We
install the upper bearings and mark the oil feed hole
location. We then take the bearings and machine a
matching hole to allow oil to flow more freely. Because
the #1 main bearing really has 2 feed holes we did not machine
that bearing. In some cases we actually restrict the oil
to the #1 main to help even the supply to the entire engine,
but in this case we felt the blower belt might demand the oil
supply.