289 heads on a 302
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Old March 18th, 2009, 03:13 PM   #1
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289 heads on a 302


Hello
I have been looking in my ford engine book and it says, if you put 289 heads on a 302 it adds 1 point to the compression. This sounds good to me as i dont have to change the pistons to up the CR.

But was wondering if anyone has put a set of 289 heads on 302. And had good results.
I know hypos are very good, but very expensive. But would a set of 289 heads that have had same size valves as 302 fitted, then ported and scimed.
Work better than these 87 smog piped 302 heads.

If any one has done this or know some one whos done this please let me know good/bad points it would be grate.
Cant afford trickflows or any other alli heads.

Thanks
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Old March 18th, 2009, 03:45 PM   #2
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try to find a set of gt40p heads off an explorer, you'll have MUCH better results. and not to expensive...
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Old March 18th, 2009, 04:23 PM   #3
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and get the upper/lower intake while youre at it
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Old March 18th, 2009, 09:13 PM   #4
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Originally Posted by mustangsoldier View Post
try to find a set of gt40p heads off an explorer, you'll have MUCH better results. and not to expensive...
Not true!

he said with the same size valves as a 302/ then the 289 with smaller chambers and bigger ports would be better
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Old March 19th, 2009, 12:55 AM   #5
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nevermind breezed over it and didn't see that....
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Old March 19th, 2009, 09:58 AM   #6
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E7TE have 1.78 valves. GT40p's have 1.84's. I think the gt40p's outflow the 289's also. I would go with the gt40p head. You can always mill them down to get more compression too
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Old March 22nd, 2009, 10:08 AM   #7
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Thanks guys.
I want as big a valves as posible, with highest compresion, so thats grate.
sound
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Old March 22nd, 2009, 11:36 PM   #8
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Adding E6 heads will raise your compression.








Just kidding, but it will add compression, just has very poor performance.

GT40P heads like mentioned above, will add hp/tq and raise your compression. But, you'll need special headers, since the spark plug angles are different.
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Old March 23rd, 2009, 09:09 AM   #9
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Originally Posted by coreyflipp View Post
E7TE have 1.78 valves. GT40p's have 1.84's. I think the gt40p's outflow the 289's also. I would go with the gt40p head. You can always mill them down to get more compression too
Yes, P heads are probably the best flowing factory Windsor head. I'd take a set of P heads over 289 heads any day.
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Old March 23rd, 2009, 07:54 PM   #10
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Originally Posted by Darrell View Post
Yes, P heads are probably the best flowing factory Windsor head. I'd take a set of P heads over 289 heads any day.

What about a set of 289 heads that are very professionally ported (to match a 1262 intake gasket) with 2.02 valves and matched to a worked over Edelbrock Air Gap carbed intake ported to a 1262 gasket as well as some runner and plenum work?

Just bought the intake today, a different guy has the heads w/ 1.6 aluminum roller rockers and two brand new Fel-Pro 1006 head gaskets for $650... springs are good to .560 lift.

I need to pull the trigger on this soon... If I do it all all.
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Old March 23rd, 2009, 07:59 PM   #11
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*edited*

The guy was not naturally aspirated, he was running a 200 shot to get the 6.9's.... My car would run that with my heads so nevermind on that.
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Old March 24th, 2009, 08:56 PM   #12
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Originally Posted by **Chris** View Post
What about a set of 289 heads that are very professionally ported (to match a 1262 intake gasket) with 2.02 valves and matched to a worked over Edelbrock Air Gap carbed intake ported to a 1262 gasket as well as some runner and plenum work?

Just bought the intake today, a different guy has the heads w/ 1.6 aluminum roller rockers and two brand new Fel-Pro 1006 head gaskets for $650... springs are good to .560 lift.

I need to pull the trigger on this soon... If I do it all all.
Measure the valves. I bet they are 1.94s. We've tried to put 2.02 valves in several factory Ford heads and they are too big if you put a 1.60 exhaust valve in. Those heads should work pretty good if the port job is good. I'd ask for a flow sheet with the heads so you know where they are at. Without knowing what they flow you are shooting ducks blind folded.
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Old March 24th, 2009, 10:08 PM   #13
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Thanks Darrell.... he said the valves are 2.02's but I have been told that valves that big will not work with stock pistons so being told that you are more than likely right about them being 1.94's since he said the pistons were stock.

He also told me that they are not ported to match the 1262's (there is just not enough material to make them that big)...but that I would have to use the 1262's.

I'm getting conflicting info on all sides.... and for the money, I think I'd rather wait until I know for sure what I am buying.... I don't understand the "twisted wedge" heads, my one Mustang car shop guy said the Twisted wedge heads are the only heads that can run a true 2.02 valve with stock pistons and that not even AFR 185's would work.

What does twisted wedge mean?
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Old March 25th, 2009, 01:55 AM   #14
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Originally Posted by **Chris** View Post
Thanks Darrell.... he said the valves are 2.02's but I have been told that valves that big will not work with stock pistons so being told that you are more than likely right about them being 1.94's since he said the pistons were stock.

He also told me that they are not ported to match the 1262's (there is just not enough material to make them that big)...but that I would have to use the 1262's.

I'm getting conflicting info on all sides.... and for the money, I think I'd rather wait until I know for sure what I am buying.... I don't understand the "twisted wedge" heads, my one Mustang car shop guy said the Twisted wedge heads are the only heads that can run a true 2.02 valve with stock pistons and that not even AFR 185's would work.

What does twisted wedge mean?
Twisted Wedge is a patented design by Trick Flow. Probably the best bang for the buck in a small block Ford head. Personally, I'd stick that $650 that the guy wants for the 289 heads toward a set of Trick Flow heads. You will be much happier with the investment.
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Old March 25th, 2009, 02:30 AM   #15
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the twisted wedge heads rotate the valves position in the combustion chamber so you can use a 2.02 valve with the stock pistons
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Old March 25th, 2009, 02:37 AM   #16
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Yeah Twisted Wedge heads are a better bet. but remember you will need to buy New Roller Rockers, the ones for the Trickflow heads are different from your normal head RR's.
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Old March 25th, 2009, 01:35 PM   #17
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Originally Posted by The Novice View Post
Yeah Twisted Wedge heads are a better bet. but remember you will need to buy New Roller Rockers, the ones for the Trickflow heads are different from your normal head RR's.
Says who? I've been running Trick Flow heads for years on multiple engines and never used any special roller rockers. If you run shaft mount rockers then there is a specific shaft set up for almost every individual head out there but for a basic roller rocker, they are interchangeable between twisted wedge and conventional heads. Unless some companies are selling twisted wedge specific roller rockers now as some sort of marketing scheme. I've never had any valve train geometry issues so I can't see why there would be a specific rocker unless it was just a marketing issue.
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Old March 25th, 2009, 03:30 PM   #18
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Aren't the pushrods different on twisted wedge heads though?????
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Old March 25th, 2009, 03:51 PM   #19
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Originally Posted by jack90gt View Post
Aren't the pushrods different on twisted wedge heads though?????
Yes, the push rod length is different.
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Old March 25th, 2009, 05:56 PM   #20
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Thanks for the info Darrell.
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