Category: 600 Horsepower 468 BBC build

Archive for the ‘600 Horsepower 468 BBC build’ Category

Saturday, August 28th, 2010

600 HP 468 Big Block JMac Performance is building a 600 Horsepower street 468 Big Block Chevy engine.  As the build progresses I will cover all the details that goes into building a high quality street engine. As our foundation we’ll be using a Gen V four bolt main 7.4L block Pictured below are all the  parts that will go into [...]

Friday, August 27th, 2010

600 HP 468 Big Block “The beginning” We start our build with a Gen V – 4 bolt main 7.4L (454) block. The block gets fully machined; Hot tanked, magged for cracks, line honed, bored .030 over, and decked to zero deck height   The extra casting (flash) is removed and all the threads are individually cleaned with a [...]

Thursday, August 26th, 2010

600 HP 468 Big Block “Checking bottom end clearances”  To insure our 468 will live a long and happy life we need to check all the clearances of the bottom end.  We started out by cleaning and deburring all the bearings.  This is a step most engine builders delete. I like to verify the quality of [...]

Wednesday, August 25th, 2010

600 HP 468 Big Block  ”Bottom end installed”  I used the micrometer to check the Forged SRP piston diameter (4.277″) then I checked the cylinder diameter with a bore gauge (4.281″) subtracting the two and we get (.004″) piston to cylinder wall clearance.  To insure proper cylinder sealing and minimize oil consumption the ring end gap [...]

Tuesday, August 24th, 2010

600 HP 468 Big Block  ”Camshaft and oiling system installed” I  buttom up the lower end with the installation and degreeing of the camshaft. I’m using Isky hydraulic roller cam 396282/294. After adjusting the crank sprocket the final resting position for the camshaft is +3 degrees advanced        Unlike flat tappet camshafts roller cams rely on backing plates [...]

Monday, August 23rd, 2010

600 HP 468 Big Block “Heads, valve train, and induction system installed” Before bolting on the heads and valve train I needed to verify the valve to piston clearance.  I placed small chunks of modelling clay in the valve reliefs. The head gaskets were installed and the heads bolted in place The rocker arms, lifters, and [...]

Sunday, August 22nd, 2010

600 HP 468 Big Block  ”Dyno Testing – Judgement Day” To insure we got all the performance out of our 468 build it was run on a DTS Powermark engine dyno at Saddleback Community College in Mission Viejo Calif. I did an  intial 15 minute break-in then a few short pulls to verfy timing and set the air/fuel ratio.  After [...]