Steam holes in Profiler heads - Chevelle Tech
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post #1 of 14 (permalink) Old Oct 24th, 19, 11:02 AM Thread Starter
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Jeff
 
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Steam holes in Profiler heads

Anyone ever drill steam holes in Profiler heads? In my search for heads for my 400 I looked into Profiler. I asked them about drilling the holes and they don't do it. I talked to a head guy and he said he drilled one set and won't do another. What's up with that?
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post #2 of 14 (permalink) Old Oct 24th, 19, 12:45 PM
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Re: Steam holes in Profiler heads

Drilling steam holes in aftermarket aluminum heads is hit or miss. You can't go by the same set up as with older iron heads from a 400. ON some alum heads you need a different angle and you may never hit water. Most guys just don't bother these days.

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post #3 of 14 (permalink) Old Oct 24th, 19, 1:13 PM
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Re: Steam holes in Profiler heads

look up speir, ask Chad himself. Curious to see why they said that. Metallurgy problem? hope not
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post #4 of 14 (permalink) Old Oct 24th, 19, 1:14 PM Thread Starter
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Re: Steam holes in Profiler heads

Scott, so no problems with steam pockets or running hot on the street?
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post #5 of 14 (permalink) Old Oct 24th, 19, 3:33 PM
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Re: Steam holes in Profiler heads

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Scott, so no problems with steam pockets or running hot on the street?
That seemed to be a GM issue. If you gooogle the subject you'll get a ton of explanations but I don't think it's a problem. I think GM did it because they "thought" there would be issues with the siamese cylinders in the 400 or something about if the engine had to idle too long it would cause issues...something like that.

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post #6 of 14 (permalink) Old Oct 28th, 19, 8:05 AM
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Re: Steam holes in Profiler heads

Dart does it if you request it or so I was told when talked to them about a set of pro1 230 heads for my 400 project.
Only thing for me is, I been looking at a set of 230 pro 1's local for $1400 they are complete assembled from Dart but gone through by a local builder that did some work to them as far as gasket matching and exhaust valve opening up in the chambers they started life as 64cc but are closer to 66cc now. So like you was looking to get the holes done after the fact lol. My local machine shop here in pueblo will drill them but said pretty much what Scot did about with aftermarket heads they don't see the need.

PS.They charge $60 for the pair if you really want them done.

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post #7 of 14 (permalink) Old Oct 28th, 19, 9:02 AM
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Re: Steam holes in Profiler heads

I think you only need the bottom ones.

Jim

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post #8 of 14 (permalink) Old Oct 28th, 19, 10:53 AM Thread Starter
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Re: Steam holes in Profiler heads

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Originally Posted by 77 cruiser View Post
I think you only need the bottom ones.
I just looked at the deck on the block and I think you're correct. You can see where steam would get trapped at the lower hole because of the siamese bore, but the top hole has a large water passage in the deck right above it so as the steam rises it could escape there.
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post #9 of 14 (permalink) Old Oct 28th, 19, 12:38 PM
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I had deck plugs installed obviously before decking and had the holes done in my afr’s but prolly didn’t have to as mentioned prior.
Never had an issue running hot. Just a summit alum rad with 2 1” rows and a summit alum water pump. Elect fan or clutch same result. 170*
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post #10 of 14 (permalink) Old Oct 28th, 19, 3:57 PM
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Re: Steam holes in Profiler heads

I picked up a set of "Holley" Aluminum Heads a few years ago. The owner had no info, and he was pretty much giving them away, and I figured "How Bad Can They Be" compared to 882's. I emailed Holley, for information and specifications and they sent me (snail mail) everything I had asked for....even a couple of Holley Stickers.....About three days after, I got the package I got an email advising me "Under No Circumstance Drill Steam Holes In These Heads", it will void the warranty.
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post #11 of 14 (permalink) Old Oct 29th, 19, 7:12 AM
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Re: Steam holes in Profiler heads

Quote:
Originally Posted by nitrofox View Post
Anyone ever drill steam holes in Profiler heads? In my search for heads for my 400 I looked into Profiler. I asked them about drilling the holes and they don't do it. I talked to a head guy and he said he drilled one set and won't do another. What's up with that?
I don't drill them.
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post #12 of 14 (permalink) Old Oct 29th, 19, 10:11 AM
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Re: Steam holes in Profiler heads

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Originally Posted by WHT/73 View Post
I had deck plugs installed obviously before decking and had the holes done in my afrís but prolly didnít have to as mentioned prior.
Never had an issue running hot. Just a summit alum rad with 2 1Ē rows and a summit alum water pump. Elect fan or clutch same result. 170*
where did you get the deck plugs from? I may have them done to mine just for piece of mind.

78 Malibu, 402, eddy heads, 174 B&M blower, th350, holley sniper EFI, 9" 3:70, 26X8.50-15 slicks.
69 VW baja 1679cc. stick shift toy.
96 chevy 1500, tow vehicle.
03 yz85 fun bike.
04 scion XB daily driver.
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post #13 of 14 (permalink) Old Oct 30th, 19, 10:27 AM
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Quote:
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Quote:
Originally Posted by WHT/73 View Post
I had deck plugs installed obviously before decking and had the holes done in my afr’s but prolly didn’t have to as mentioned prior.
Never had an issue running hot. Just a summit alum rad with 2 1” rows and a summit alum water pump. Elect fan or clutch same result. 170*
where did you get the deck plugs from? I may have them done to mine just for piece of mind.
My engine builder bought and installed them then did all the machine work to the block.
I would think you could get them at summit/JEGS
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post #14 of 14 (permalink) Old Oct 30th, 19, 4:45 PM
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Re: Steam holes in Profiler heads

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where did you get the deck plugs from? I may have them done to mine just for piece of mind.
They are just 3/4" allen head pipe plugs but if you want a set already drilled Moroso has them
https://www.summitracing.com/parts/mor-37800

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