intake question
Elder User
Joined: Sep 2004
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From: Floriduh
Your WAY better off porting and adding 1.94/1.60 valves to your stock 302 castings. Thats what I did with mine, and my 67 mustang now runs 10.60's at 127 at the track. Of course, thats with a little nitrous assistance, but it runs 11.40's without the NOS. The key is knowing WHAT to port out of the heads and how FAR to port them.
A 351w intake will NOT fit a 302, nor will a 302 intake fit a 351w. That said, the HEADS are basicly all the same, and will transfer over, with the exception of the ones listed by Matt95L. Those will transfer over too, but they have bigger valves in them and no thermactor bumps in the exhaust ports.
However, even those heads wont give you the performance that porting a stock set of 302 heads and adding 1.94/1.60 valves will.
A 351w intake will NOT fit a 302, nor will a 302 intake fit a 351w. That said, the HEADS are basicly all the same, and will transfer over, with the exception of the ones listed by Matt95L. Those will transfer over too, but they have bigger valves in them and no thermactor bumps in the exhaust ports.
However, even those heads wont give you the performance that porting a stock set of 302 heads and adding 1.94/1.60 valves will.
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Senior User
Joined: Jun 2005
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From: london, Kentucky
Sorry I didn't respond for so long I was on vacation, but on a more serious note, the the heads I actually have on the engine are from a 1966 289. They were out of a mustang, my grandpa says it was a Gt-500, but i know they didn't have 289's in them, however a Gt-350 did so i think that is what he meant. But I do have two sets of 302 heads and one set of 351 heads, do the 289's breathe as good as the 302's?
Elder User
Joined: Sep 2004
Posts: 525
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From: Floriduh
It depends on the years of the 302 heads as to how well they breath. If they were manufactured after say, 1972, then the 289 heads breath better. The later model 302 heads have a bump in the exhaust for the thermactor which greatly reduced their breathability. Simply taking a die grinder to that thermactor bump and removing it will allow the 302 heads to breath as well or better than the 289 heads.
My suggestion, is to port the 302 heads, sell the 289 heads and install the 302 heads for now. Take the money you made on the 289 heads and put some more with it and buy a set of nice aluminum ones for a couple bucks more.
My suggestion, is to port the 302 heads, sell the 289 heads and install the 302 heads for now. Take the money you made on the 289 heads and put some more with it and buy a set of nice aluminum ones for a couple bucks more.
Elder User
Joined: Jun 2002
Posts: 678
Likes: 3
From: Dallas, Texas
For power, you are better off building the older 351w heads, a little porting, milling and larger valves work well with these. It is best to use head bolt bushings on these to make up the size difference in the bolt holes. The 289 heads can work well too as well as raise your compression. Be mindful that the price of building up one of these stock castings can often exceed the price of a good set of used performance heads that would work much better.
I am an avid drag racing enthusiast and would be very interested in an NA 302 that runs 11.40's with stock heads. What kind of setup do you have there?
Originally Posted by 53wa2fl
Your WAY better off porting and adding 1.94/1.60 valves to your stock 302 castings. Thats what I did with mine, and my 67 mustang now runs 10.60's at 127 at the track. Of course, thats with a little nitrous assistance, but it runs 11.40's without the NOS. The key is knowing WHAT to port out of the heads and how FAR to port them.
A 351w intake will NOT fit a 302, nor will a 302 intake fit a 351w. That said, the HEADS are basicly all the same, and will transfer over, with the exception of the ones listed by Matt95L. Those will transfer over too, but they have bigger valves in them and no thermactor bumps in the exhaust ports. However, even those heads wont give you the performance that porting a stock set of 302 heads and adding 1.94/1.60 valves will.
A 351w intake will NOT fit a 302, nor will a 302 intake fit a 351w. That said, the HEADS are basicly all the same, and will transfer over, with the exception of the ones listed by Matt95L. Those will transfer over too, but they have bigger valves in them and no thermactor bumps in the exhaust ports.
However, even those heads wont give you the performance that porting a stock set of 302 heads and adding 1.94/1.60 valves will.Last edited by Jimbo302; Jul 28, 2005 at 11:31 AM.
Elder User
Joined: Sep 2004
Posts: 525
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From: Floriduh
Originally Posted by Jimbo302
I am an avid drag racing enthusiast and would be very interested in an NA 302 that runs 11.40's with stock heads. What kind of setup do you have there?
I guess I wasnt clear before. I hope this clears up any confusion.
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Elder User
Joined: Jun 2002
Posts: 678
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From: Dallas, Texas
Wow, 53wa2fl, thats a pretty modest combo to put up those numbers, very nice. What does it mph NA? I imagine its a light car that sees great 60fts, although I wouldn't think the converter would be loose enough for that.
Elder User
Joined: Sep 2004
Posts: 525
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From: Floriduh
With the 351 it's running 116-118 NA depending on the weather. I forget the 60fts now because it's been so long since I ran it NA. I almost alway open the bottle now unless i'm on empty. But running the juice, I'm getting dismal 1.40-1.50 short times. (I dont have a transbrake yet) My mustang weighs 3000 race ready with me in it and 4 gallons of fuel. I forgot to tell you that the heads have also been shaved .030 and I'm running thin head gaskets. Those times are all atributed to the heads IMHO. But I could be wrong.
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