1986 Chevy C10 SWB Step Side

[aotte1]

Close up of valve train

[aotte1]

Another valve train

[aotte1]

Trying again

[aotte1]

This is a pretty basic build. I will list parts I used in an upcoming post once I get engine run-in on dyno and can provide results for build. Plan to do engine run-in next week.

Les

[aotte1]

Generic Cylinder Head Flow

I used a set of new generic alu heads from a local large automotive parts supplier that were recommended by a builder of circle track engines, who has used them a lot. They are a really nice casting, with quality parts, and come complete. For performance applications I use Profiler heads.

Measured the cylinder head flow on one center cylinder to get an idea of what the flow was for later tuning efficiency. Below are the intake and exhaust numbers. These heads flow really nice for a stock set of street heads out of the box, vs a set of good factory iron heads ported, and cost a lot less, plus being alu. Good if using alu intake, less expansion leak issues vs iron/alu.

Intake Flow @28in.
.050 46
.100 76
.200 122
.300 164
.400 200
.450 215
.500 225
.550 234
.600 234

Exhaust Flow @28in.
.050 39
.100 60
.200 105
.300 140
.400 167
.450 180
.500 184
.550 187

NOTE: measured on a SuperFlow SF 600

I was very pleased w/numbers, especially down low where it counts. Off the seat numbers are really good. Will see how they work on the dyno later. I am very lucky to have a friend who lets me used his equipment for a lunch.

[aotte1]

Did the engine break-in this afternoon on the dyno, everything went well. Ran engine-in for about 30 mins in three steps. Pump gas, air cleaner, temp 180 degrees for dyno pulls. It sounded really nice during the pulls. Will post build info and results in a day or two. The torque was really good, a nice flat torque curve.

[jpnh]

cool