BruceH
BBB Big Bore Boss 322
I'm just about to start this. I've been writing about it in bits and pieces and now I'd like to start a thread to track progress. Parts should be back from the machine shop sometime this week. I'm getting a little antsy to start. I keep thinking about starting the tear down now but I'm trying to do this build with patience in mind and every time I've started a build early something has happened to delay it.
An overview of the build particulars are as follows:
Big Bore Boss block, FRPP cnc heads, Comp 26113 valve springs, special grind cams, Kellogg 3.75" stroke crank, Diamond flat top pistons, Manley 5.85" h beam rods with arp 2000 bolts, Mac ceramic long tubes with a Mac pro chamber h pipe.
The bore and stroke will be 3.7 x 3.75 which will yield 322 cubic inches. The bore/stroke/head combination will result in right at 12:1 compression. Fuel will be primarily E85 but it will also be able to run on 92 pump.
The cams are a special grind. An easy way to describe them is that they have the same durations and lifts as Comp 127500 cams but the lsa is 113 and they are ground with 6 degrees of retard (108 intake centerline vs 102). My plan is to degree and install them locked out with somewhere between 0-4 degrees of additional retard. I keep changing my mind on this. Right now I've settled on installing them straight up and just using the built in 6 degrees of retard.
The machine shop is doing a bore/hone, decking the block, fitting the rings, trueing the rods, balancing the rotating assembly and setting bearing clearance to .0015". The piston to bore clearance will be set to Diamonds recommendation of .0035".
That's the start of it. I'll update with pics as it progresses. A few to start with:
An overview of the build particulars are as follows:
Big Bore Boss block, FRPP cnc heads, Comp 26113 valve springs, special grind cams, Kellogg 3.75" stroke crank, Diamond flat top pistons, Manley 5.85" h beam rods with arp 2000 bolts, Mac ceramic long tubes with a Mac pro chamber h pipe.
The bore and stroke will be 3.7 x 3.75 which will yield 322 cubic inches. The bore/stroke/head combination will result in right at 12:1 compression. Fuel will be primarily E85 but it will also be able to run on 92 pump.
The cams are a special grind. An easy way to describe them is that they have the same durations and lifts as Comp 127500 cams but the lsa is 113 and they are ground with 6 degrees of retard (108 intake centerline vs 102). My plan is to degree and install them locked out with somewhere between 0-4 degrees of additional retard. I keep changing my mind on this. Right now I've settled on installing them straight up and just using the built in 6 degrees of retard.
The machine shop is doing a bore/hone, decking the block, fitting the rings, trueing the rods, balancing the rotating assembly and setting bearing clearance to .0015". The piston to bore clearance will be set to Diamonds recommendation of .0035".
That's the start of it. I'll update with pics as it progresses. A few to start with: