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Author
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Topic: gt40 heads on 86 block?
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510.86.notch
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Member # 9892
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posted
 
 
I've heard some people say it will not work?some say it will no problem.anybody with experience with this feel free to chime in.thanks for any info.
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91 mustang coupe
84 mustang svo
89 mustang.4cyl5speed.
87 thunderbird turbo coupe-sold
86 mustang GT hatch-sold-kinda
86 mustang coupe-sold
Posts: 1062 | From: san leandro | Registered: Apr 2010
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v-town coupe
fordologist
Member # 2771
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posted
the deal with 86 motors is that there is no valve reliefs like the 87-95 motors. when putting on a set of GT40's you are putting on a head with a bigger valve thus reducing your valve to piston clearance. hopefully some one will chime in who has done or "tried" the swap. not sure if this is your DD. but you could always take the old heads off but the GT-40's on and clay it if you find no answer. if it doesnt work be ready to fly cut the pistons.
Posts: 4597 | From: the V-town | Registered: May 2003
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510.86.notch
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Member # 9892
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posted
thanks.i'm thinking i am going to have to cut the pistons or go with a newer block.can anyone chime in on cutting the pistons?how hard and how much it cost?is it worth it?thanks for the input.
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91 mustang coupe
84 mustang svo
89 mustang.4cyl5speed.
87 thunderbird turbo coupe-sold
86 mustang GT hatch-sold-kinda
86 mustang coupe-sold
Posts: 1062 | From: san leandro | Registered: Apr 2010
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Duncan Motors
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Member # 7045
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posted
they sink the vavle higher in the head on those motors. its a pile in it self. get a newer lower end, then do what u want.
Posts: 6310 | From: Vallejo | Registered: Sep 2006
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510.86.notch
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Member # 9892
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posted
quote:
Originally posted by Duncan Motors:
they sink the vavle higher in the head on those motors. its a pile in it self. get a newer lower end, then do what u want.
yea that's what I've been reading and hearing.it really sucks the motor is so healthy,low miles and have had no major issues.guess i'll have to pull it and sell it.what year short block should i look for?90-93 also would need to be mass air converted?thanks for all the help.
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91 mustang coupe
84 mustang svo
89 mustang.4cyl5speed.
87 thunderbird turbo coupe-sold
86 mustang GT hatch-sold-kinda
86 mustang coupe-sold
Posts: 1062 | From: san leandro | Registered: Apr 2010
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Duncan Motors
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Member # 7045
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posted
87 to 93 is the best but 86 to 95 will work. a new wire harness and computer, and the pieces off the throttle body.
Posts: 6310 | From: Vallejo | Registered: Sep 2006
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v-town coupe
fordologist
Member # 2771
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posted
as long as your not making any big changes you can put another motor in there. just because your using the later motor doesnt mean you will need to go mass air. aim for an 87-92 motor they were forged piston motors with valve reliefs.
Posts: 4597 | From: the V-town | Registered: May 2003
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510.86.notch
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Member # 9892
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posted
quote:
Originally posted by Duncan Motors:
87 to 93 is the best but 86 to 95 will work. a new wire harness and computer, and the pieces off the throttle body.
ok.thanks.what about the 96 explorer motor.its definitely putting a hold on everything.i have alot of project stuff to do already.thanks again.
[ January 25, 2012, 06:43 PM: Message edited by: 510.86.notch ]
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91 mustang coupe
84 mustang svo
89 mustang.4cyl5speed.
87 thunderbird turbo coupe-sold
86 mustang GT hatch-sold-kinda
86 mustang coupe-sold
Posts: 1062 | From: san leandro | Registered: Apr 2010
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510.86.notch
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Member # 9892
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posted
quote:
Originally posted by v-town coupe:
as long as your not making any big changes you can put another motor in there. just because your using the later motor doesnt mean you will need to go mass air. aim for an 87-92 motor they were forged piston motors with valve reliefs.
would it be smarter to convert it to mass air or leave speed density?i figured we would be in there with the motor out.all it is 96 gt40 setup with the normal boltons.thanks again for the information.
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91 mustang coupe
84 mustang svo
89 mustang.4cyl5speed.
87 thunderbird turbo coupe-sold
86 mustang GT hatch-sold-kinda
86 mustang coupe-sold
Posts: 1062 | From: san leandro | Registered: Apr 2010
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v-town coupe
fordologist
Member # 2771
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posted
yeah mass air is going to be better for sure! just wasnt sure what kind of budget your on. if you have the means to to buy and install everything to convert you to mass air do it!
Posts: 4597 | From: the V-town | Registered: May 2003
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510.86.notch
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Member # 9892
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posted
thanks for all the help.going to have to make money for it.
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91 mustang coupe
84 mustang svo
89 mustang.4cyl5speed.
87 thunderbird turbo coupe-sold
86 mustang GT hatch-sold-kinda
86 mustang coupe-sold
Posts: 1062 | From: san leandro | Registered: Apr 2010
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510.86.notch
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Member # 9892
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posted
looks fun!
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91 mustang coupe
84 mustang svo
89 mustang.4cyl5speed.
87 thunderbird turbo coupe-sold
86 mustang GT hatch-sold-kinda
86 mustang coupe-sold
Posts: 1062 | From: san leandro | Registered: Apr 2010
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triple b
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Member # 8763
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posted
Even with another stock motor in there u need to check the piston to valve Clearence these motors are not big valve ready and u will be limited on cam selection
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1988 4cyl conv 306 HCI "sasha"
2004 tahoe
Sold- 87 GT, 72 chevelle, 63 biscane, 82 monte carlo, 73 nova, 88 silverado,
Posts: 1730 | From: sacramento ca | Registered: Nov 2008
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510.86.notch
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Member # 9892
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posted
thanks its just a mild set up for my girl.so a alphabet cam or tfs1 will be good for me.thanks for the heads up.definitely will be check ptv clearance.
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91 mustang coupe
84 mustang svo
89 mustang.4cyl5speed.
87 thunderbird turbo coupe-sold
86 mustang GT hatch-sold-kinda
86 mustang coupe-sold
Posts: 1062 | From: san leandro | Registered: Apr 2010
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