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Old 04-04-2012, 07:32 PM   #1
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What do you think?

So I have decided to rebuilt my 95 gt and bore and stoke it to a 331. I was gonna get the trick flow top end kit but that's too expensive. So instead I'm gonna port the stock heads and have them rebuilt. Any ideas for cam? Intake?
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Old 04-04-2012, 08:26 PM   #2
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If you have the stock E7 heads even porting them is not going to be even close to good enough for a 331. If money is that big of a deal get some gt40 heads for now that are already ported, you can find them from time to time ported and cleaned up for 550-600 i think which is not to bad and they will flow a ton more then the crappy E7 heads.
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Soon to be Vortech blown with a built 306 Numbers and times to follow!!!
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Old 04-04-2012, 08:28 PM   #3
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Quote:
Originally Posted by cgarray17
If you have the stock E7 heads even porting them is not going to be even close to good enough for a 331. If money is that big of a deal get some gt40 heads for now that are already ported, you can find them from time to time ported and cleaned up for 550-600 i think which is not to bad and they will flow a ton more then the crappy E7 heads.
+ 1 even if you cant find them already ported you get pick up a set real cheap at the boneyard.
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Old 04-04-2012, 08:32 PM   #4
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Ok. What can would go best with ported gt40 heads?
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Old 04-04-2012, 08:38 PM   #5
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the cobra/gt 40 intake works well with those heads and can also be picked up cheap.you can also source the intake from the boneyard.they are on explorers 96 and up but im not sure if they can all be ported as much as the cobra version.

for cam choice its probably best to contact a professional.but the favorites seem to be tfs stage one and e303.but if you are getting knotched pistons you may get away with something more radical.
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Old 04-04-2012, 09:07 PM   #6
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My upper and lower explorer intake was ported to match the felpro 1250 gasket and opened up for a 70mm throttle body. I don't think you can port a tubular gt40 upper intake though. If its possible, I can't imagine it could go very much.
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Old 04-04-2012, 09:08 PM   #7
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My upper and lower explorer intake was ported to match the felpro 1250 gasket and opened up for a 70mm throttle body. I don't think you can port a tubular gt40 upper intake though. If its possible, I can't imagine it could go very much.
yeah,thats what i was thinking of.
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Old 04-04-2012, 09:16 PM   #8
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How much horsepower would I get out of ported gy40 heads, a trick flow stage 1 cam, and the gt40 intake?
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Old 04-04-2012, 10:42 PM   #9
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Depends on your combo but I read on another forum about a guy who had the stock HO cam along with a ported explorer intake and gt40p heads making 280.
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Old 04-05-2012, 05:24 AM   #10
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Quote:
Originally Posted by 5.slow
Depends on your combo but I read on another forum about a guy who had the stock HO cam along with a ported explorer intake and gt40p heads making 280.
Ya but thats a stock 302 he is saying he wants to go 331 so with the added cubes probably 340 range all will depend on the head port job as they will be the restrictive part still. I mean you hear of 331 with big heads and big intakes making almost 400 at the wheeles so i think 330-340 is about where it will be at.
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Old 04-05-2012, 09:58 AM   #11
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So with all this would I need to upgrade the injectors?
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Old 04-05-2012, 10:18 AM   #12
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Most likely.24s should do with matching maf
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Old 04-05-2012, 10:35 AM   #13
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Ok. I already have a 75mm MAF and a bbk cai. I was gonna add a 75mm tb.
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Old 04-05-2012, 10:36 AM   #14
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Originally Posted by Napoleon
Ok. I already have a 75mm MAF and a bbk cai. I was gonna add a 75mm tb.
Your maf will need to be calibrated to the injectors.
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Old 04-05-2012, 05:26 PM   #15
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Re: What do you think?

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Originally Posted by Napoleon View Post
Ok. I already have a 75mm MAF and a bbk cai. I was gonna add a 75mm tb.
75MM TB is too big. You will lose velocity or air speed.
The air intake system works best if it is "funnel shaped".
Bigger at the beginning and smaller at the engine intake.
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Old 04-05-2012, 05:36 PM   #16
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Originally Posted by Trojan Horse

75MM TB is too big. You will lose velocity or air speed.
The air intake system works best if it is "funnel shaped".
Bigger at the beginning and smaller at the engine intake.
i always had a question about the funnel theory.do you have to gasket match all the intake components so it doesnt create ridges/steps from the changing in size?
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Old 04-05-2012, 06:19 PM   #17
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Re: What do you think?

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i always had a question about the funnel theory.do you have to gasket match all the intake components so it doesnt create ridges/steps from the changing in size?
It's a good idea to do so.
It prevents turbulence and promotes, smooth uninterrupted air flow into the engine.
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Old 04-05-2012, 06:48 PM   #18
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Ah ok. That makes a sense. So I should go with a 70mm throttle body or maybe a 65mm?
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Old 04-05-2012, 07:07 PM   #19
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Re: What do you think?

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Originally Posted by Napoleon View Post
Ah ok. That makes a sense. So I should go with a 70mm throttle body or maybe a 65mm?
Since you are planning a 331, go with the 70MM TB.
I'd use 24 lb injectors and a 75MM MAF calibrated for them.


You biggest power increase will come from heads.
If you cannot afford the Trick Flow kit that includes HC&I, then maybe try to get a set of AFR 165 or 185 heads. The big plus of aluminum heads is the additional air flow and the weight reduction they provide.
There is a magazine article where they used a lightly built 5.0 and picked up 100 HP by just bolting on a set of the AFR 165 heads.
Look in the Useful Info sticky thread and follow the links to some of the build articles in there for combination ideas.
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