Fitting alloy heads

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Offline Evo

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Fitting alloy heads
« on: September 06, 2019, 02:22:46 PM »
GDay All

I can remember reading on here about drilling out water galleries on the block prior to fitting alloy heads.
Ive found a set of aeroflows
Can someone help me out with some more info regarding this ?
I did try the search bar but was unable to find what i was looking for.

Online Dwayne

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Re: Fitting alloy heads
« Reply #1 on: September 06, 2019, 03:42:17 PM »
Steam holes

Here's the ones ShaunP did on my motor build:




Offline barnett468

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Re: Fitting alloy heads
« Reply #2 on: September 07, 2019, 12:33:02 PM »
before you install the heads, you should check to see how far the piston is below the deck as you might want to run thinner head gaskets to obtain a decent quench clearance.

Offline skev

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Re: Fitting alloy heads
« Reply #3 on: September 07, 2019, 01:01:34 PM »
Also, you might want to use a compression calculator to see if you need to get them planed.
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Offline Reborn67

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Re: Fitting alloy heads
« Reply #4 on: September 07, 2019, 06:21:53 PM »
 Hey Gents, sorry to but in but I need some advice, Regarding these " steam holes"
 It would appear that my SBW has these holes and they appear to be plugged up, Seem to be 3 per side, gone into a bit of a panic mode considering the stage of my build,
 How important are these holes to be clear or even exist when fitting AFR heads?
 Will try to post a photo for clarity, If l can fit it on a postage stamp........,
 Andrew,

Offline Reborn67

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Re: Fitting alloy heads
« Reply #5 on: September 07, 2019, 06:34:34 PM »
Steam holes

Offline barnett468

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Re: Fitting alloy heads
« Reply #6 on: September 08, 2019, 03:09:00 AM »
Your holes are not plugged up. The head gasket had holes in it in that area so the coolant merely corroded the block surface a little.

Online Clubman7

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Re: Fitting alloy heads
« Reply #7 on: September 08, 2019, 09:05:08 AM »
The plugs in the holes that I think you mean are core supports that are left behind from the casting process. They were never actually a hole.

Offline shaunp

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Re: Fitting alloy heads
« Reply #8 on: September 09, 2019, 09:37:30 AM »
Steam holes

They are actually not plugged, its bits of wire rod that goes trough the block, its sometimes hard to drill them as a result. This wire must have been to hold the molds together when they were casting the blocks

Offline Reborn67

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Re: Fitting alloy heads
« Reply #9 on: September 09, 2019, 09:50:08 AM »
As usual, thanks for feedback,
So what now, do l try drill them out or just leave them be, to me if they donít have any relevance to new alloy heads just forget about them?

Online Clubman7

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Re: Fitting alloy heads
« Reply #10 on: September 09, 2019, 09:58:57 AM »
You just need to add the steam hole as required to suit the heads you are fitting. The wires left in the block do not need removal. I had to drill to suit
the Edelbrock heads I fitted in my 289 but this was done as per the instructions supplied. Wires were kept in block.

Offline Reborn67

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Re: Fitting alloy heads
« Reply #11 on: September 09, 2019, 04:23:27 PM »
 Thanks for clarifying, still haven't got the heads yet,  too busy doing other stuff, (renovating, don't tell Barnett...,)
 So once l get the heads l will see what is required and take it from there...., Andrew. :thumb:

Offline pony289

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Offline Reborn67

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Re: Fitting alloy heads
« Reply #13 on: September 11, 2019, 07:02:22 AM »
 Thanks for the link, its makes a lot more sense now, as always, great to get advice from people that know their stuff..,

 

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