My 307 Build Up

[w3lfd]

I just got finished with a rebuild / mod of my '69 C10 307 motor and I figured I would document what went into and the results here.

Parts List:
(prices include shipping)

#416 casting 305 heads: 1.84 intake, 1.5 exhaust, 58cc chamber -- $90
Used Edelbrock 1406 Carb (600 CFM) -- $50
Edelbrock RPM Performer 2101 Intake -- $80
Summit Racing Cam SUM-1103 (http://www.summitracing.com/parts/SUM-1103/) -- $55.00
Summit Racing Hydraulic Lifters (16) (http://www.summitracing.com/parts/SUM-HT817/) -- $50
Summit Racing SBC Gasket Set (http://www.summitracing.com/parts/SUM-G2600/) -- $30
Partial total: $355

Additional Parts that I used in the swap that aren't necessarily required:

Motor Mounts (http://www.summitracing.com/parts/PIO-A2282/) -- $10
Oil Filter Sandwich Adapter (http://www.summitracing.com/parts/MRG-1272/) --$23
Chrome Steel Fuel Line (http://www.summitracing.com/parts/EDL-8126/) -- $20
Main Bearing Set (http://www.summitracing.com/parts/FEM-4663M/) -- $30
Rod Bearings (http://www.summitracing.com/parts/FEM-2555CP/) (8) -- $30
Timing Chain Set -- $20
HEI Distributor -- $80

Grand Total: $568

Cam specs:
Duration at 050 inch Lift 214 int./224 exh.
Advertised Duration 272 int./282 exh.
Valve Lift with Factory Rocker Arm Ratio 0.442 int./0.465 exh.
Lobe Separation (degrees) 112

As built, I calculated the static compression ratio to be 10.5:1 with a dynamic compression ratio of 9.33:1.
These numbers may not be 100% accurate, but they should be pretty close.


So far it is running great on 93 octane pump gas.


The 307 I was building was using a press fit harmonic balancer with no center crank bolt. While the motor was out I went ahead and drilled / tapped the hole for the crank bolt (7/16 - 20). It made installing the balancer a lot easier than hammering it on or trying to locate a special tool. All of the loaner tools that I could find in chain stores required the tapped crank snout.

I removed the fenders, hood, grill, and core support. This made the whole process much easier than it would have been otherwise. I pulled the motor without the tranny attached. Upon re-installation, I found that I needed to
jack up the tail of the transmission in order get the motor to go in.

I am loving the end result. I do not have any specs yet on actual horsepower or torque, but the seat of the pants results are enough to get 2 thumbs up in my book. It is a huge difference. The edelbrock is a piece of cake to get setup.

I will be posting pics and hopefully video as well soon.