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Old 03-02-2014, 08:56 AM   #1
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Ok lots of questions I need help with.

1st question. I have an 86 gt with efi. I want to do 17" rims but I want the widest rims and tires all the way around without rubbing or Doing a tub or Rollin fenders.

2nd question. Every time I look up engine parts it'll say from years 87-93. Why is my year excluded when it is also a fuel injection.

3rd question. Can I make 500rwhp from using the stock upper and lower intake if I get them ported to match the heads? Here's a list of the engine work I plan on doing.
Roush heads. Block bored .30 over. Matching cam to heads. Block decked .15. Keith black pistons. 70mm throttle body. And 44 pound injectors. Thank you for your time I hope to hear back from everyone!!
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Old 03-04-2014, 10:13 PM   #2
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Is any one gonna respond to this
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Old 03-04-2014, 11:46 PM   #3
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1st question how wide of a wheel you want to go with. I would upgrade my front brakes to the 87-93 if you haven't already. The factory 86gt rotors have a hard enough time stopping with the 15" wheels.
2nd the 86gt shares the same engine gasket set with the exception of the throttle body is smaller on the 86. The heads, cam, and pistons are different. The 86 302 was upgraded in 87 heads, cam, pistons, larger upper intake and throttle body.
3rd someone else will chime in here. Is your car a 5spd or automatic is it still speed density or have you upgraded to mass air. I've had 2 86gts and they are dogs in stock form. You can do some cheap mods to wake it up a bit then go from there.
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Old 03-05-2014, 05:02 PM   #4
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1st question how wide of a wheel you want to go with. I would upgrade my front brakes to the 87-93 if you haven't already. The factory 86gt rotors have a hard enough time stopping with the 15" wheels.

2nd the 86gt shares the same engine gasket set with the exception of the throttle body is smaller on the 86. The heads, cam, and pistons are different. The 86 302 was upgraded in 87 heads, cam, pistons, larger upper intake and throttle body.

3rd someone else will chime in here. Is your car a 5spd or automatic is it still speed density or have you upgraded to mass air. I've had 2 86gts and they are dogs in stock form. You can do some cheap mods to wake it up a bit then go from there.

I would like to do 17x9's all the way around but I'm not sure if they will rub. And I have an extra 302 in the shed that I want to build up. That being said it's out of a mustang that is newer then 86 I hve to run the numbers to find out for sure. So does that mean I can put any engine modifications on it?
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Old 03-05-2014, 05:27 PM   #5
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The 17x9 will rub when you make a hard turn. The mods interchange on the 302s , the disadvantage you have with the 86 302 is pistons are flat with no valve reliefs. Your limited on cam selection and rocker arm ratio.
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Old 03-05-2014, 09:14 PM   #6
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44lb injectors seem big for that set up without a power adder. I

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Old 03-05-2014, 09:38 PM   #7
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The 17x9 will rub when you make a hard turn. The mods interchange on the 302s , the disadvantage you have with the 86 302 is pistons are flat with no valve reliefs. Your limited on cam selection and rocker arm ratio.

Thank you very much. What if I take out my inner fenders will that eliminate the rubbing?
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Old 03-05-2014, 10:05 PM   #8
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Thank you very much. What if I take out my inner fenders will that eliminate the rubbing?
The inner fender well will only rub in one spot, I would not remove them. The main spot that rubs is the fender trim directly in front of the front tires. Under normal driving they shouldn't rub, only when you make a u turn will they rub. If you lower the car the inner lip on the quarter panel directly above the rear tire will need to be flatten. This will cut your tires if not flattened. 17×8 will work better if you haven't purchased your wheels yet.
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Old 03-05-2014, 10:09 PM   #9
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The inner fender well will only rub in one spot, I would not remove them. The main spot that rubs is the fender trim directly in front of the front tires. Under normal driving they shouldn't rub, only when you make a u turn will they rub. If you lower the car the inner lip on the quarter panel directly above the rear tire will need to be flatten. This will cut your tires if not flattened. 17×8 will work better if you haven't purchased your wheels yet.

No I haven't bought wheels yet but I'm looking. Also curios. If I put a motor in from a newer foxbody will I need to change anything that has to do with my wiring harness?
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Old 03-05-2014, 10:16 PM   #10
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No I haven't bought wheels yet but I'm looking. Also curios. If I put a motor in from a newer foxbody will I need to change anything that has to do with my wiring harness?
You can use your 86 harness. If can find a 89 5.0 parts car the mass air set up will be a great addition and will be needed for future engine mods
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Old 03-06-2014, 08:18 AM   #11
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You can use your 86 harness. If can find a 89 5.0 parts car the mass air set up will be a great addition and will be needed for future engine mods

What does the mass air do?
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Old 03-14-2014, 08:50 PM   #12
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The mass air changes what your computer is monitoring to keep your engine running right (air/fuel ratio). Speed density which you have is good in stock form but can only compensate for small improvements like intake and cold air, once you get wilder than that, the computer can't keep up and the car will barely run and won't idle.

Mass air measures the amount of air coming into the engine. It relays the amount of air to the computer and it adjusts the air/fuel to run properly. This system can be tuned to run properly with aftermarket heads, intakes, cams, etc. it's a much more forgiving system and a must for performance.
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Old 03-18-2014, 12:13 PM   #13
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The mass air changes what your computer is monitoring to keep your engine running right (air/fuel ratio). Speed density which you have is good in stock form but can only compensate for small improvements like intake and cold air, once you get wilder than that, the computer can't keep up and the car will barely run and won't idle.

Mass air measures the amount of air coming into the engine. It relays the amount of air to the computer and it adjusts the air/fuel to run properly. This system can be tuned to run properly with aftermarket heads, intakes, cams, etc. it's a much more forgiving system and a must for performance.

Ok thank you very much. I have a brand new motor from a 88-93 fox I have to run the numbers. My uncle works for ford and the motor had a bent valve from factory so they replaced the engine and my uncle kept it and gave it to me. It has less then 500 original factory miles. Can I buy a mass air off eBay or late model restorations or something thank you very much
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Old 03-18-2014, 06:01 PM   #14
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Ok thank you very much. I have a brand new motor from a 88-93 fox I have to run the numbers. My uncle works for ford and the motor had a bent valve from factory so they replaced the engine and my uncle kept it and gave it to me. It has less then 500 original factory miles. Can I buy a mass air off eBay or late model restorations or something thank you very much
Yes you can buy a conversion for your car. I know you will need a newer throttle body for your new motor and I cant remember if the upper intake on the 86 is smaller internally. The new motor won't perform to it full potential with the 86gt throttle body.
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Old 03-19-2014, 06:46 AM   #15
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Big show is right, the main differences between the 86 and 87's are the e6 heads and the upper plenum has smaller runners, hence the hp rating of 205 vs 225.

Fiveology racing has a great mass air conversion kit. MM&FF did a good write up of one they did and I also have the kit waiting to be installed on my 86.

I would once over the motor you are getting and look for a set of gt40 or gt40p heads and an explorer or cobra upper and lower intake with larger throttle body. The heads and explorer intake can be picked up pretty cheap and will bet some decent gains.
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Old 03-19-2014, 06:47 AM   #16
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Net some decent gains.
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Old 03-19-2014, 06:50 AM   #17
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And I forgot the matching EGR spacer to go with the larger throttle body.
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Old 03-19-2014, 01:13 PM   #18
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[ QUOTE=Dion11197;1972159]Big show is right, the main differences between the 86 and 87's are the e6 heads and the upper plenum has smaller runners, hence the hp rating of 205 vs 225.

Fiveology racing has a great mass air conversion kit. MM&FF did a good write up of one they did and I also have the kit waiting to be installed on my 86.

I would once over the motor you are getting and look for a set of gt40 or gt40p heads and an explorer or cobra upper and lower intake with larger throttle body. The heads and explorer intake can be picked up pretty cheap and will bet some decent gains.[/QUOTE]

I'm buying a set of roush heads that used to be on my real dads 351w with $3,000 worth of machine work done. I have the upper and lower intake for the new motor that I'm getting machined to match the heads I'm buying.
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Old 03-24-2014, 05:13 PM   #19
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Wow, 3k worth of head work is crazy! You may want to check to see how pig the ports are and how much air they flow. On a basically stock 302 you can only go so big before you go backwards and actually loose hp and tq.
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Old 03-24-2014, 05:16 PM   #20
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Wow, 3k worth of head work is crazy! You may want to check to see how pig the ports are and how much air they flow. On a basically stock 302 you can only go so big before you go backwards and actually loose hp and tq.

That includes the valves. Rockers. Springs etc.
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Old 03-24-2014, 11:16 PM   #21
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Wow, 3k worth of head work is crazy! You may want to check to see how pig the ports are and how much air they flow. On a basically stock 302 you can only go so big before you go backwards and actually loose hp and tq.
+1
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