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7K3 cylinder heads

 
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super
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Joined: 08 Aug 2006
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Location: Sullivan, Missouri

1974 Super Duty TransAm

PostPosted: Wed Mar 05, 2008 8:54 am    Post subject: 7K3 cylinder heads Reply with quote

Does the 7K3 cylinder head have any good performance characteristics? I am asking in reference to a street application.

A friend is purchasing a 1972 Formula 400 car. Considering using the 7K3 heads that are already on the car.
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evil455



Joined: 28 May 2006
Posts: 129




PostPosted: Wed Mar 05, 2008 1:50 pm    Post subject: Reply with quote

Larry Cooper told me they are damn close to the same heads as the casting 48. Both have 2.11 and 1.77 valves. Only downfall they have that I know of is they don't have a hole for one header bolt on each head.
My 81 has a set of 7K3 heads on it. Haven't had a moments problem out of them. Very good performance wise as well!

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Thomas Horn
1980 Pontiac Trans Am...restored to original
1981 Pontiac Trans Am...street/strip...
1980 Pontiac Firebird/Trans Am...strip...
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super
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Joined: 08 Aug 2006
Posts: 639
Location: Sullivan, Missouri

1974 Super Duty TransAm

PostPosted: Wed Mar 05, 2008 3:15 pm    Post subject: Reply with quote

Thank you for the information. Good to know.

Can a guy drill and tap the heads for a header bolt on each side? Will it create problems by doing so? I know some heads like the 7F6 are similar. A guy can drill and tap the head to run another bolt to seal things up.

Might just run Ram Air manifolds on the engine. Should make the '72 run plenty hard.

Thank you
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Bruce I won Indy Fulper



Joined: 19 Jun 2006
Posts: 232




PostPosted: Wed Mar 05, 2008 11:27 pm    Post subject: Reply with quote

The 7k3's are ok. Like all screw-in stud D-port heads, they all respond to the same porting. They all have the same limitations. The only major difference is the combustion chamber size. But....

there are so many D-ports available that don't have the end bolt hole problem that it's easy to find something that's less a PITA. If it's all you have or you simply want to use them, -

on my site under the FAQ button is a picture of a simple bracket you can make in order to seal the header gasket on the end of the head.

There is not enough material to drill and tap a hole.
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evil455



Joined: 28 May 2006
Posts: 129




PostPosted: Thu Mar 06, 2008 7:07 am    Post subject: Reply with quote

Jeff I've heard of people on the PY Board drilling and tapping a hole...they say you just have to be careful and know what your doing.
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Thomas Horn
1980 Pontiac Trans Am...restored to original
1981 Pontiac Trans Am...street/strip...
1980 Pontiac Firebird/Trans Am...strip...
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Bruce I won Indy Fulper



Joined: 19 Jun 2006
Posts: 232




PostPosted: Thu Mar 06, 2008 11:56 am    Post subject: Reply with quote

Thomas:

What you might want to do before you wish to applaud the py worlds wealth on Pontiac engine "experience" - is to look - with your OWN eyes so as not to make embarrassing statements.

There is no material on that spot, on a 7k3 head, to drill or tap a hole.

Need a picture?
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evil455



Joined: 28 May 2006
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PostPosted: Thu Mar 06, 2008 12:31 pm    Post subject: Reply with quote

sorry buddy, no I do not need a picture...I have a set of the heads myself if you would have read the above post I made, you would be aware of that.
If I ever I can find one that has been done I'll let you know.
I may be mistaken, but I thought I remembered seeing someone drill one. If not, oh well.
Thanks

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Thomas Horn
1980 Pontiac Trans Am...restored to original
1981 Pontiac Trans Am...street/strip...
1980 Pontiac Firebird/Trans Am...strip...
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evil455



Joined: 28 May 2006
Posts: 129




PostPosted: Thu Mar 06, 2008 12:41 pm    Post subject: Re: 7K3 cylinder heads Reply with quote

super wrote:
Does the 7K3 cylinder head have any good performance characteristics? I am asking in reference to a street application.

A friend is purchasing a 1972 Formula 400 car. Considering using the 7K3 heads that are already on the car.



jeff here is a link for a bracket...
http://www.spottsperformance.com/headLbracket

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Thomas Horn
1980 Pontiac Trans Am...restored to original
1981 Pontiac Trans Am...street/strip...
1980 Pontiac Firebird/Trans Am...strip...
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super
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Joined: 08 Aug 2006
Posts: 639
Location: Sullivan, Missouri

1974 Super Duty TransAm

PostPosted: Thu Mar 06, 2008 12:43 pm    Post subject: Reply with quote

Took the time this morning to contact Selden Ruwwe, a retired independent business man that lived for Pontiacs most of his life. Selden stated that the 7K3 head was a decent D-port head. He stated the casting not having the tapped hole for the exhaust. Unlike other early 70's heads, the 7K3 can not have a hole drilled and tapped according to Selden.

With the mild combination we are planning to run, he suggested our earlier idea, running Ram Air D-port manifolds. We want a dependable engine we can run everywhere. We wanted to use the 7K3 heads simply because they are already on the 400 in the Formula.

Looks like manifolds it will be. Hopefully we can easily get the Firebird in to the 13's in the 1/4-mile. If not that, low 14's. It is all for fun anyway you look at it.

Thank you guys for the information you passed on to me in the earlier responses.

Thanks
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super
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Joined: 08 Aug 2006
Posts: 639
Location: Sullivan, Missouri

1974 Super Duty TransAm

PostPosted: Thu Mar 06, 2008 12:51 pm    Post subject: Reply with quote

Thanks Thomas and Bruce for the idea to run a bracket on the heads. Looks very simply to fabricate. If for some reason we decide to run headers, we can easily make one.

Scott may change his mind. When it is all said and done, he might want a 12-second street machine. Never know.

Thanks
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Bruce I won Indy Fulper



Joined: 19 Jun 2006
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PostPosted: Fri Mar 07, 2008 12:28 pm    Post subject: Reply with quote

evil455 wrote:
sorry buddy, no I do not need a picture...I have a set of the heads myself if you would have read the above post I made, you would be aware of that.
If I ever I can find one that has been done I'll let you know.
I may be mistaken, but I thought I remembered seeing someone drill one. If not, oh well.
Thanks


Thomas: Careful "buddy." There will be no attitudes tolerated on this site. Scoot back some and do your best to helpful FIRST and foremost only.

You're not running interference for anyone here.
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evil455



Joined: 28 May 2006
Posts: 129




PostPosted: Fri Mar 07, 2008 3:25 pm    Post subject: Reply with quote

Yes Sir Mr. Fulper! Laughing
I'll let you know what I find.
Some have drilled and helicoiled the hole then installed a stud in it...

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Thomas Horn
1980 Pontiac Trans Am...restored to original
1981 Pontiac Trans Am...street/strip...
1980 Pontiac Firebird/Trans Am...strip...
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