The Ford Barn

ford1933-2008 · 06-14-2018, 07:08 AM

Hoping someone in the Barn can add some more light to this discussion. I have had some feedback from HAMB members, however I am still looking for more information.

Background, I have built a 99A Mercury stroker engine. I have a pair of Kong and a pair of Flatattack heads 8BA style. I also have a set of original 24 stud cast iron heads with the centre outlet but I prefer not to use them at this stage. I am after a little bling if I can get the 8BA style heads to work.

Has anyone had experience fitting 8BA style heads to the 99A engine? If so are there modifications I need to make to either the heads or the block to adapt them?

Hopeful David

alanwoodieman · 06-14-2018, 08:25 AM

take a head gasket from the 99A engine and place it over the 8BA style heads, that will show you what needs to be done. I think it involves plugging some holes

Ol' Ron · 06-14-2018, 08:51 AM

I don't see a problem putting the heads on the block, plumbing maybe. However, These heads have a large combustion chamber, and the CR might be quite low. Might want to CC them.

rotorwrench · 06-14-2018, 10:21 AM

The 8BA family has several different coolant ports at the front that the 59 series and earlier don't have. Use an 8BA head gasket on your block or a 99A gasket on a head to locate them. Plug the necessary ports and they should work.

A lot of aftermarket heads were set up more for relieved blocks and had crow foot type chambers. I don't know about the Kong/Flatattack Heads though. Some of the Kong heads were two piece set ups that bolt together then on. I think the Flatattack ones are one piece casting repro of the early Kong types. Flatattack comes up with some wild stuff now and then. Photos would be good.

flatjack9 · 06-14-2018, 11:47 AM

There is one hole on each head at the front that needs to be plugged. Use the 8BA head gaskets on the engine. They encouraged more coolant flow to the rear of the engine.

JSeery · 06-14-2018, 12:33 PM

Sponsored Links (Register now to hide all advertisements)

Wilcap has an article on it.

http://www.wilcap.com/59A%20heads%208BA%20block.pdf

Edit: Thought it covered both ways, but this article is 59a heads on 8ba block only!

ford1933-2008 · 06-14-2018, 04:40 PM

All, Thanks for your thoughts and suggestions. I will do as suggested and let you know how I get on. Photos to follow. Thanks David

danliveshere · 06-16-2018, 04:42 AM

David jump on the flat attack web site and ask Mike about his heads. He’ll be able to give you the right info that you need.

06-14-2018, 07:08 AM	#1
ford1933-2008 Senior Member Join Date: Mar 2011 Location: Australia Posts: 159	Flatattack heads on a 99A Mercury engine Hoping someone in the Barn can add some more light to this discussion. I have had some feedback from HAMB members, however I am still looking for more information. Background, I have built a 99A Mercury stroker engine. I have a pair of Kong and a pair of Flatattack heads 8BA style. I also have a set of original 24 stud cast iron heads with the centre outlet but I prefer not to use them at this stage. I am after a little bling if I can get the 8BA style heads to work. Has anyone had experience fitting 8BA style heads to the 99A engine? If so are there modifications I need to make to either the heads or the block to adapt them? Hopeful David

06-14-2018, 08:25 AM	#2
alanwoodieman Senior Member Join Date: May 2010 Location: upstate SC Posts: 2,963	Re: Flatattack heads on a 99A Mercury engine take a head gasket from the 99A engine and place it over the 8BA style heads, that will show you what needs to be done. I think it involves plugging some holes

06-14-2018, 08:51 AM	#3
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Flatattack heads on a 99A Mercury engine I don't see a problem putting the heads on the block, plumbing maybe. However, These heads have a large combustion chamber, and the CR might be quite low. Might want to CC them.

06-14-2018, 10:21 AM	#4
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,431	Re: Flatattack heads on a 99A Mercury engine The 8BA family has several different coolant ports at the front that the 59 series and earlier don't have. Use an 8BA head gasket on your block or a 99A gasket on a head to locate them. Plug the necessary ports and they should work. A lot of aftermarket heads were set up more for relieved blocks and had crow foot type chambers. I don't know about the Kong/Flatattack Heads though. Some of the Kong heads were two piece set ups that bolt together then on. I think the Flatattack ones are one piece casting repro of the early Kong types. Flatattack comes up with some wild stuff now and then. Photos would be good.

06-14-2018, 11:47 AM	#5
flatjack9 Senior Member Join Date: May 2010 Location: Oshkosh, Wi Posts: 4,526	Re: Flatattack heads on a 99A Mercury engine There is one hole on each head at the front that needs to be plugged. Use the 8BA head gaskets on the engine. They encouraged more coolant flow to the rear of the engine.

06-14-2018, 12:33 PM	#6
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: Flatattack heads on a 99A Mercury engine Sponsored Links (Register now to hide all advertisements) Wilcap has an article on it. http://www.wilcap.com/59A%20heads%208BA%20block.pdf Edit: Thought it covered both ways, but this article is 59a heads on 8ba block only!

06-14-2018, 04:40 PM	#7
ford1933-2008 Senior Member Join Date: Mar 2011 Location: Australia Posts: 159	Re: Flatattack heads on a 99A Mercury engine All, Thanks for your thoughts and suggestions. I will do as suggested and let you know how I get on. Photos to follow. Thanks David

06-16-2018, 04:42 AM	#8
danliveshere Senior Member Join Date: Jul 2010 Location: Cairns , Australia Posts: 746	Re: Flatattack heads on a 99A Mercury engine David jump on the flat attack web site and ask Mike about his heads. He’ll be able to give you the right info that you need.