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375 runs, aprox 900+ hp. What parts will it need? Lets see

dvw

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Pulled the engine Tuseday. Everything's apart except the heads. What looks good? Crank, rods, pistons, rings, rod bearings, cam lifters, pushrods, jesel cam drive. What does it need? Touch hone (though the walls are nice). It has .9mm AP stainless rings which will be reused. It was leak checked (cold). All were 10% or less. Except #5. 48 %, intake port pouring air. Once the heads were off a piece of paper towel was stuck between the valve and seat. There's the leakage. Must have got in there when the motor was being rotated to remove the rockers. What's not good? Shear plates below the carbs were leaking. Anaerobic sealer and race gas are not compatible. 3 out of 8 rocker shafts are worn. 3 others were worn in the Spring when the rockers were replaced. I'm surprised that this is an issue. Actually 2 are brinneled/pitted, 1 worn. #3 main side bolt is broke in the cap about 1/4". It threaded right out. All the side bolts will be replaced. The bed plate that holds three rocker shafts had loose bolts. It's held by 3 studs and 4 bolts, 1 into the roof of each intake port. All 7 were torqued together. Never had this issue previously. The main caps show some metal transfer. They've been like this since I got the short block used 13 years ago. The main bearings had a few chunks of crap go through them as did the oil pump. I will make sure this time everything is spotless. Last freshen was after it broke a rod. Had to be braze and sleeve the block. A lot of welding and grinding to repair the oil pan. I thought it was clean, obviously not. Going to get honed tomorrow. Nice when you are friends with your machinist and you go right to the front of line. Ill try to get the heads apart and check them while I'm there.
Doug

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Hey! If this hobby keeps you out of trouble with your wife, girlfriend, police, parole officer, preacher, bill collector, and makes you happy, why stop?
Mike
 
Pulled the engine Tuseday. Everything's apart except the heads. What looks good? Crank, rods, pistons, rings, rod bearings, cam lifters, pushrods, jesel cam drive. What does it need? Touch hone (though the walls are nice). It has .9mm AP stainless rings which will be reused. It was leak checked (cold). All were 10% or less. Except #5. 48 %, intake port pouring air. Once the heads were off a piece of paper towel was stuck between the valve and seat. There's the leakage. Must have got in there when the motor was being rotated to remove the rockers. What's not good? Shear plates below the carbs were leaking. Anaerobic sealer and race gas are not compatible. 3 out of 8 rocker shafts are worn. 3 others were worn in the Spring when the rockers were replaced. I'm surprised that this is an issue. Actually 2 are brinneled/pitted, 1 worn. #3 main side bolt is broke in the cap about 1/4". It threaded right out. All the side bolts will be replaced. The bed plate that holds three rocker shafts had loose bolts. It's held by 3 studs and 4 bolts, 1 into the roof of each intake port. All 7 were torqued together. Never had this issue previously. The main caps show some metal transfer. They've been like this since I got the short block used 13 years ago. The main bearings had a few chunks of crap go through them as did the oil pump. I will make sure this time everything is spotless. Last freshen was after it broke a rod. Had to be braze and sleeve the block. A lot of welding and grinding to repair the oil pan. I thought it was clean, obviously not. Going to get honed tomorrow. Nice when you are friends with your machinist and you go right to the front of line. Ill try to get the heads apart and check them while I'm there.
Doug

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That piece of paper towel hung up in the valve takes the cake !

The internal flow dynamics of an engine.

Can really Suck !

You gotta be extra careful when the homeless guy on the corner comes to wash your windshield at the Red Light!

Hahahaha…..

Mopar2ya!!

John
 
Broke a main cap side bolt? Wow. I've never heard of that. I wonder how that happened?
 
Broke a main cap side bolt? Wow. I've never heard of that. I wonder how that happened?
I have no idea. It's had allen bolts in it since I got. I replace them with grade 8. When it kicked the rod it cracked the block between #1 and #3. Maybe it stressed? The Crack repair still appears solid.

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Sounds like the issues you’re finding are all in the category of “exactly the reason you do a maintenance teardown”.

Do your heads run individual rocker shafts? I guess Im shocked to report that I’m not recalling what heads you run. A few pictures would help print this picture on my brain. I guess aim only familiar with quasi-race stuff. This 8-second zone hardware picture is apparently more foreign to me than I would have guessed.

Mostly, it’s great to see you’re having fun and keeping yourself busy with plenty of projects. Retirement is starting come into view for me, and I’m hopeful I can keep myself just as motivated.
 
I have no idea. It's had allen bolts in it since I got. I replace them with grade 8. When it kicked the rod it cracked the block between #1 and #3. Maybe it stressed? The Crack repair still appears solid.

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Hey DVW ….

Is that a block girdle you got on that

Bad Boy Big Block ?

I’ve often thought the deep skirt BBM

Would benefit from one , especially if it was

Swinging a Stroker setup …

COOL !

Mopar2ya!!

John
 
Hey DVW ….

Is that a block girdle you got on that

Bad Boy Big Block ?

I’ve often thought the deep skirt BBM

Would benefit from one , especially if it was

Swinging a Stroker setup …

COOL !

Mopar2ya!!

John
No girdle. It is a old Mopar mega block with the center main caps cross bolted like a Hemi.
Doug
 
I have no idea. It's had allen bolts in it since I got. I replace them with grade 8. When it kicked the rod it cracked the block between #1 and #3. Maybe it stressed? The Crack repair still appears solid.

View attachment 1986127
I’m sure you know that Allen bolts (SHCS) are a lot stronger than grade 8. Though they are a pain to wrench on in a car at times.
 
I’m sure you know that Allen bolts (SHCS) are a lot stronger than grade 8. Though they are a pain to wrench on in a car at times.
I didn't know that.. are they more brittle/prone to fatigue issues?
 
Got the block honed today. The sleeved #3 cylinder was slightly out of round. Had to go .002" over to clean it up. So the pistons will go to Line to Line for skirt coating. When it broke a rod in 2021 the area in between main #2 and #3 by the dipstick hole was cracked. It was repaired but apparently where the side bolt broke there is about .009" clearance from the cap to the block. #2 has about .006" in the same spot. All rest are less than .002". Maybe the cause of the side bolt failure. For sure ther was signs of metal transfer in that area. So I'll see about getting some thin shims to slide in the gap. I can remove material to use a slightly thicker shim. Have to see whats available. Crank got polished, looks great. Got the drivers side head apart and cleaned. It didn't vacuum test great on the intakes, exhausts were great. The seats were carboned up pretty good. If it passes now all good, if not we will touch up the seats and valves.
Doug
 
Got the block honed today. The sleeved #3 cylinder was slightly out of round. Had to go .002" over to clean it up. So the pistons will go to Line to Line for skirt coating. When it broke a rod in 2021 the area in between main #2 and #3 by the dipstick hole was cracked. It was repaired but apparently where the side bolt broke there is about .009" clearance from the cap to the block. #2 has about .006" in the same spot. All rest are less than .002". Maybe the cause of the side bolt failure. For sure ther was signs of metal transfer in that area. So I'll see about getting some thin shims to slide in the gap. I can remove material to use a slightly thicker shim. Have to see whats available. Crank got polished, looks great. Got the drivers side head apart and cleaned. It didn't vacuum test great on the intakes, exhausts were great. The seats were carboned up pretty good. If it passes now all good, if not we will touch up the seats and valves.
Doug
Maybe hard chrome the side of the caps.
 
Talked with Charlie Wescott today. He says shim the caps. Got the heads apart. .05 mm feeler gauge won't pass thru anywhere. Springs test about 10lbs above spec. All are +/-3lbs concept one which is about +10lbs. Retainers look great. Had a few valve locks with marks from previous assy, so they got swapped.. valves cleaned up nice with green Scotch Brite. Will vacuum check them this week. The header gaskets didn't fit the port opening very well. Raised the bolt holes about .100". Much better
 Doug


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Talked with Charlie Wescott today. He says shim the caps. Got the heads apart. .05 mm feeler gauge won't pass thru anywhere. Springs test about 10lbs above spec. All are +/-3lbs concept one which is about +10lbs. Retainers look great. Had a few valve locks with marks from previous assy, so they got swapped.. valves cleaned up nice with green Scotch Brite. Will vacuum check them this week. The header gaskets didn't fit the port opening very well. Raised the bolt holes about .100". Much better
 Doug


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Were those header gaskets impeding exhaust flow by that small edge enough to cause a disturbance in the runners?
 
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