The official FABO machinist/member collaboration, busted 340 thread

-
replicaracer43 said:
To say this block was in poor condition would be a severe understatement, even checking the decks in the block squaring fixture indicated one side unlevel front to rear, and the other deck unlevel and twisted... after decking the block to a true square condition, it resulted in the piston out of the deck far enough to push our compression ratio a bit high, so the solution was to mill the piston tops to end up at about 9.6 static with the iron heads. I'm going to call this thing "problem child" I do believe. But, we are making progress! Stay tuned!

View attachment 1715994907
Click to expand...

How much did you end up milling off the decks and off the pistons?
 
mopowers said:
How much did you end up milling off the decks and off the pistons?
Click to expand...
Engine had been rebuilt who knows how many times prior to this build, so the deck was likely shortened up some allready, but it took right at .017 to square up the block. Ended up cutting the pistons about .028 to end up at I believe at .015 positive deck
 
replicaracer43 said:
Engine had been rebuilt who knows how many times prior to this build, so the deck was likely shortened up some allready, but it took right at .017 to square up the block. Ended up cutting the pistons about .028 to end up at I believe at .015 positive deck
Click to expand...
Just wondering if the intake angles will have to be modified now?
 
CFD244 said:
Just wondering if the intake angles will have to be modified now?
Click to expand...

It was all flat milling so the angles don’t change. He will most likely have to mill some off the intake manifold, although some guys would rather mill expensive heads and jack them up. I take it off the intake.
 
Rat Bastid said:
It was all flat milling so the angles don’t change. He will most likely have to mill some off the intake manifold, although some guys would rather mill expensive heads and jack them up. I take it off the intake.
Click to expand...
Why take from the intake? Now you're locked into that intake and also you can't use it on another. If you swap intakes for whatever reason now you have to cut it. What do you mean "jack" them up? Milling the intake face on a SBM is super straight forward. J.Rob

p.s. We know its you YR.
 
RAMM said:
Why take from the intake? Now you're locked into that intake and also you can't use it on another. If you swap intakes for whatever reason now you have to cut it. What do you mean "jack" them up? Milling the intake face on a SBM is super straight forward. J.Rob

p.s. We know its you YR.
Click to expand...
Thanks for the reply fellows.......Lets let @replicaracer43 answer so we don't water down his thread. :)
 
mgoblue9798 said:
Twisted and off that much and it had been shortened before? Must have used a belt sander. :)
Click to expand...
They are often off quite a bit from the factory, and a lot of times shops will just mount the block up, level it to the cutter, and just skim a few tho off. That doesn't correct the slope or rolled deck situation. More labor intensive to correct to square, but worthwhile in my opinion.
 
This thread is awesome from the point that engine owner ended up with something not as anticipated to a builder/machinist saying "let me help" and other members willing to provide needed parts. You just have to appreciate and respect the community.
My curiosity has led me to ask the builder/machinist, when all done and ready to return to owner do you plan to dyno and if so I'm sure a video will be shared?
Thank you for your willingness to help another and sharing with everyone. Kudos to you.
 
Joe Mc said:
This thread is awesome from the point that engine owner ended up with something not as anticipated to a builder/machinist saying "let me help" and other members willing to provide needed parts. You just have to appreciate and respect the community.
My curiosity has led me to ask the builder/machinist, when all done and ready to return to owner do you plan to dyno and if so I'm sure a video will be shared?
Thank you for your willingness to help another and sharing with everyone. Kudos to you.
Click to expand...
I dont think the owner of the engine is looking for dyno pulls, although it is available, I use a outside source for that, so that cost would add up for a day of testing
 
replicaracer43 is a stand up machinist. Nice shop. Since I only lived an hour away, I went there in 2020/2021 with the date coded 340X heads from the 68 GTS 340" I bought to fix up. Very nice shop. Extremely clean. Dude cares about his work. Whoever this motor is for, they are in good hands.
 
Just so everyone doesn't think we slackin off around here, doing some final checks after installing new cam bearings, and checking main clearance....shes starting to shape up!

20221010_171752.jpg


20221010_171322.jpg
 
Joe Mc said:
This thread is awesome from the point that engine owner ended up with something not as anticipated to a builder/machinist saying "let me help" and other members willing to provide needed parts. You just have to appreciate and respect the community.
My curiosity has led me to ask the builder/machinist, when all done and ready to return to owner do you plan to dyno and if so I'm sure a video will be shared?
Thank you for your willingness to help another and sharing with everyone. Kudos to you.
Click to expand...
If u need a Dam good [Professional] machine shop and Mopar specialist
this man cant be beat !!
He has my business for life !!
 
You must log in or register to reply here.
-

Back
Top