What advantages are there to painting the inside of the block?

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never done it and never will. don't see any reason to. waste of money and time.

I did one block a LONG time ago. Never again. Right there with you. Time better spent elsewhere in the process. Once an oil film is there, no point in the paint. Engine builders equivalent to a "Slip n Slide"

Put it together and run it. If the stuff decides to delaminate, have fun!

Run the thing on a dyno, add oil until it starts killing power, go back a few ounces... Done!
 
The amount of labor and cost to apply, then to still "cross fingers"?? No thanks.
It sounds if not prepped properly it acts like powder coating flaking off?
I did a bbc once the paint never cured I had to spend a lot more time removing it and wound up sanding and polishing the intake valley
It took many hours but its like chrome inside now!..lol
At least the oil should flow back fast.
 
I did a bbc once the paint never cured I had to spend a lot more time removing it and wound up sanding and polishing the intake valley
It took many hours but its like chrome inside now!..lol
At least the oil should flow back fast.
That's what I have a 9 qt pan for lol
 
Has any engine failed because the inside of the block wasn't painted?
01 A1.jpg
 
The amount of labor and cost to apply, then to still "cross fingers"?? No thanks.
It sounds if not prepped properly it acts like powder coating flaking off

Actually Steve .... If you could get the correct color in Glyptal, it looks like pretty good stuff to paint the outside of the block!!

General consensus seems to be its unnecessary to paint the inside except for Race engines.
 
Actually Steve .... If you could get the correct color in Glyptal, it looks like pretty good stuff to paint the outside of the block!!

General consensus seems to be its unnecessary to paint the inside except for Race engines.
i wouldn't do it in a race engine either.
 
A whole group of experts has effectively nuked a processes successfully used by numerous engine builders over decades because a few can't follow proper procedures.
 
A whole group of experts has effectively nuked a processes successfully used by numerous engine builders over decades because a few can't follow proper procedures.
Can you point to a mass engine builder like say Blueprint that uses it?
 
Glyptal will wash off with hot water .
That's just a fun fact.
That be pure dee baloney sauce, DUDE:mad:
i have more than one block that was painted inside the lifter galleys with glyptol ran through both types of machine shop cleaning processes, spray washer and so on. Some places were thinner than others as far as what was painted originally but none of it was washed off completely:soapbox:
I didn't repaint them as I didn't think it was needed, I have been Mopar only for a lot of years, I did have one customer, Bob Bauder, in SO CA that wanted me to build or rebuild non Mopar brand motors and I told him that I would do one GM motor for every ten hemi motors I did for him. I think I ended up doing one SB and one BB Chevy for some of his projects or some of his customers cars. He had worked for Boyd Coddington before opening his own shop at home in Crestline, CA.
I also redid one motor for Boyd Coddington, it was a 1962 413 M.W. AKA Super Stock 413 crossram motor for one of his customers that had a original 1962 M.W. car, I can't remember now if it was for a 1962 M.W. 413 Dodge or Plymouth:BangHead:
I met with him and his customer at my home on a Saturday morning to make sure I knew exactly what his customer wanted, he wanted it kept original in appearance with the complete stock M.W. exhausts, air cleaners and so on. I told them that I would build them a motor on one condition which was I would be the only one to start and break in the new mttor installed in his car, they agreed and did what we had agreed on. I had to wait almost a full year after dropping that motor off at Boyds shop to go back and break in that motor. Boyd didn't do all the things that I had ask them to do to optimize his customer car, which was to switch to good MSD 7 series ignition with the proper coil, a good 10-inch custom built torque converter and replace the rear gears with a deeper ratio.
His customer met me there after breaking in his motor and we went for a drive (I drove) after breaking in the cam and lifters to seat the rings His customer was happy with that motor in his car, but I wasn't, it drove like a turd to me. That customer had one of Coddington very expensive street roadster that had won several trophies in CA car shows both in northern and southern CA back in the days of yesteryear, 1980s and 1990s, maybe in the early 2000s also, CRS:realcrazy:
 
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That be pure dee baloney sauce, DUDE:mad:
i have more than one block that was painted inside the lifter galleys with glyptol ran through both types of machine shop cleaning processes, spray washer and so on. Some places were thinner than others as far as what was painted originally but none of it was washed off completely:soapbox:
I didn't repaint them as I didn't think it was needed, I have been Mopar only for a lot of years, I did have one customer, Bob Bauder, in SO CA that wanted me to build or rebuild non Mopar brand motors and I told him that I would do one GM motor for every ten hemi motors I did for him. I think I ended up doing one SB and one BB Chevy for some of his projects or some of his customers cars. He had worked for Boyd Coddington before opening his own shop at home in Crestline, CA.
I also redid one motor for Boyd Coddington, it was a 1962 413 M.W. AKA Super Stock 413 crossram motor for one of his customers that had a original 1962 M.W. car, I can't remember now if it was for a 1962 M.W. 413 Dodge or Plymouth:BangHead:
I met with him and his customer at my home on a Saturday morning to make sure I knew exactly what his customer wanted, he wanted it kept original in appearance with the complete stock M.W. exhausts, air cleaners and so on. I told them that I would build them a motor on one condition which was I would be the only one to start and break in the new mttor installed in his car, they agreed and did what we had agreed on. I had to wait almost a full year after dropping that motor off at Boyds shop to go back and break in that motor. Boyd didn't do all the things that I had ask them to do to optimize his customer car, which was to switch to good MSD 7 series ignition with the proper coil, a good 10-inch custom built torque converter and replace the rear gears with a deeper ratio.
His customer met me there after breaking in his motor and we went for a drive (I drove) after breaking in the cam and lifters to seat the rings His customer was happy with that motor in his car, but I wasn't, it drove like a turd to me. That customer had one of Coddington very expensive street roadster that had won several trophies in CA car shows both in northern and southern CA back in the days of yesteryear, 1980s and 1990s, maybe in the early 2000s also, CRS:realcrazy:
Did you read his follow up comment? If not, you should.
 
That be pure dee baloney sauce, DUDE:mad:
i have more than one block that was painted inside the lifter galleys with glyptol ran through both types of machine shop cleaning processes, spray washer and so on. Some places were thinner than others as far as what was painted originally but none of it was washed off completely:soapbox:
I didn't repaint them as I didn't think it was needed, I have been Mopar only for a lot of years, I did have one customer, Bob Bauder, in SO CA that wanted me to build or rebuild non Mopar brand motors and I told him that I would do one GM motor for every ten hemi motors I did for him. I think I ended up doing one SB and one BB Chevy for some of his projects or some of his customers cars. He had worked for Boyd Coddington before opening his own shop at home in Crestline, CA.
I also redid one motor for Boyd Coddington, it was a 1962 413 M.W. AKA Super Stock 413 crossram motor for one of his customers that had a original 1962 M.W. car, I can't remember now if it was for a 1962 M.W. 413 Dodge or Plymouth:BangHead:
I met with him and his customer at my home on a Saturday morning to make sure I knew exactly what his customer wanted, he wanted it kept original in appearance with the complete stock M.W. exhausts, air cleaners and so on. I told them that I would build them a motor on one condition which was I would be the only one to start and break in the new mttor installed in his car, they agreed and did what we had agreed on. I had to wait almost a full year after dropping that motor off at Boyds shop to go back and break in that motor. Boyd didn't do all the things that I had ask them to do to optimize his customer car, which was to switch to good MSD 7 series ignition with the proper coil, a good 10-inch custom built torque converter and replace the rear gears with a deeper ratio.
His customer met me there after breaking in his motor and we went for a drive (I drove) after breaking in the cam and lifters to seat the rings His customer was happy with that motor in his car, but I wasn't, it drove like a turd to me. That customer had one of Coddington very expensive street roadster that had won several trophies in CA car shows both in northern and southern CA back in the days of yesteryear, 1980s and 1990s, maybe in the early 2000s also, CRS:realcrazy:
As you can see, this is very dull. That's from 2 hours in a hot tank 185° detergent not caustic.
IMG_20230511_200628837.jpg
then after another tear down and another trip through the hot tank for a few hours it washed completely off, on the back china wall you can see just a little red left.
IMG_20260524_203405340.jpg
no bologna sauce.
 
That is a first for me:eek:
Why does that block look like it is aluminum?
Hopefully you didn't suffer any harm from that extra strong solution in that dip tank:eek::thumbsup:
 
That is a first for me:eek:
Why does that block look like it is aluminum?
Hopefully you didn't suffer any harm from that extra strong solution in that dip tank:eek::thumbsup:
It's paint, I couldn't get the numbskulls at the paint shop to mix up single stage ev2 hemi orange or w1? Alpine white, so I picked a medium silver metallic
IMG_20260228_183251500.jpg
 
Paint the inside if you like, if you think it will make much difference. If you do, do your homework and do it right. The right prep, the right materials, and the right procedures. 90+% of us don't need it. Just sayin.
 

Plus in the end does it really MATTER? Maybe on the space shuttle?


If you need the 3-4 ounces of quick return oil, put a smidge more in it. The extra oil will carry heat off too. :) I haven't seen the inside of a current cup engine for a while. Wonder if they go through this. Those guys don't waste time and effort on stuff that isn't effective or beneficial. F1, indy car?

I'd like to see a 500-550hp mopar small block done with and without the painting. See any difference on the dyno, probably not. Water temps/oil pressure changes. If you are searching for that .005 in et and it shows improvement, great. Street beater. Nope not happening here.
 
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