So, I decided to build a new engine for the ’78. I wanted a little bit more HP then the stock L82 was providing. I also felt that the heads in the stock engine were wore out.

Here are the specifications:

Block:   GM Casting 3956618 4-bolt main  (From 1969 C10-35)
Bored: 4.030 Align Honed, Decked, Pressure Tested (0.011 deck clearance measured)
Crank:  Scat Cast Steel   Part# 9-10442
Pistons: Claimer Hyper-eutectic Flat Top (5cc relief)
Cam:  CompCam XE268H-10
Heads: Dart Iron Eagle 180 64cc (2.020″ Intake, 1.600″ exaust)
Head Gasket: (Bore 4.060″ thickness 0.027″ volume 5.73cc)
Rockers: CompCams Magnum Steel Roller Rockers 1.52
Intake: Edelbrock Performer EPS Intake (2701)
Exhaust: Patriot Headers (PTE H8025-1)

Estimated Specs adjusted for altitude of 1122ft & 75% humidity (DynoSim6)
Compression ratio: 10.45:1
Dynamic Compression: 8.7:1
Cranking Pressure: 194.98psi
Guage Pressure: 180.44
Dynamic Cranking Pressure: 176.46psi
HP: Estimated 391 @ 5250
Torque: Estimated 435 @ 4250
Timing Curve: 28.9 @ 1500   33.5 @ 3000   37.4 @ 6000

The block was bored and machined at Brazier Race and Machine in Winnipeg, Manitoba. They were very good, and did a great job on my block. They talked me into getting them to install the crank, cam, and pistons which was probably a good idea.

I painted it right away.

Then installed the Oil pump, heads, rockers, intake & water pump.