BlOWN BOSS 429 build progress

Heres some pics and info about the progress on my build.

Here it is full of critters, It was stored very poorly



Heads pulled, it looks like brand new except for the rust. Believe it or not this motor was never ran!

Heads disassembled, I didnt take many photos during the the tear down process. Most the rockers were siezed to the shafts, most valves siezed in the guides. and yeah, thats blue machinist dye around some of the valve seats and ports. the darkness in the exhaust ports is dirt, not carbon or soot.

I hate to see how something so great got all messed up just because of something so simple, like rust. Had it been stored better it would have been much cooler I'm sure.

So are you going to clean everything up then put it back together and run it? Or are you going to get a new crank, new valves, ect.? The pistons look to be fine and the heads could be cleaned with a wire brush and cleaner. Just me .02 but I could be wrong.

I cleaned the block and had it bored, Had to go .060 over because of the rust. The crank had to be cut .010 rods and .020 mains. The crank snout had quite a bit of rust from being exposed. The snout cleaned up pretty good but I had to order a custom crank hub from ATI to get the proper press fit. Its a real pain to order a custom hub but it is a real B9 forged crank.

The pistons that were in it are fine but the rings were destroyed. They are big dome JE forgings from 40 years ago. I ordered custom pistons from diamond racing.

So was this a stock bore block then? Just wondering, but was this just sitting on the ground resting on the internal parts? That's pretty cool that it is an official boss motor, they are worth some coin.

the block was .030. It was in a 69 mustang that sat outside for years then was moved just inside a farm building, intake was open along with open spark plug holes, crank damper was off, distributor was out, and no oil caps or breathers on the valve covers.
This is it the day I brought it home





And then a couple days later

Heres the new pistons and pushrods

Well I'm glad to see that you are saving another precious car that would have been scrap, bring it back to life man.

I setup one hole along with the cam lifters and head to degree in the cam and check piston to valve clearance before taking the crank in for balancing. I just used a couple light springs from the hardware store for this part. The new comp lifters are the reason for the new pushrods. The originals are 3/8 ball and cup but the new lifters use a 5/16 ball and they are taller. I had to buy new rocker adjusting screws also, they are actually for a 426 hemi but fit the B9 rockers nicely.

Are you going to put it back in the 69 or put it in something ealse.

very informative build ...keep up the good work

69F100 wrote:Are you going to put it back in the 69 or put it in something ealse.

I plan to put it in a 70 mach I have in restoration process. My brother now has the 69 and plans on putting a modular in it. Its not that I didnt want the 69 it was just a business deal we worked out. The 69 is a GT which is actually kind of rare and might have had some value if it wasnt so cut up.

Heres another mock up pic.
For some reason my wife cant understand how cool this is or why I want to spend more time in the garage than with her. You guys get it though right?

Is the shell an orig boss 9? I have a freind looking for on if you want to part with it.

AK wrote:

69F100 wrote:Are you going to put it back in the 69 or put it in something ealse.

I plan to put it in a 70 mach I have in restoration process. My brother now has the 69 and plans on putting a modular in it. Its that I didnt want the 69 it was just a business deal we worked out. The 69 is a GT which is actually kind of rare and might have had some value if it wasnt so cut up.

Heres another mock up pic.
For some reason my wife cant understand how cool this is or why I want to spend more time in the garage than with her. You guys get it though right?

i spend a lot of time in the shop too,lol
-rich

dfree383 wrote:Is the shell an orig boss 9? I have a freind looking for on if you want to part with it.

No, it was a "M" code GT