Gt40p heads and 1:7 roller rockers on 86 motor - Page 2 - Mustang Evolution

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Old 04-15-2012, 07:06 PM   #36
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I dont mean to jack Ur thread, but is anyone aware of a set of heads that can be used on the 86 motors?? I'm running e7's right now.
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Old 04-15-2012, 07:21 PM   #37
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Quote:
Originally Posted by 1fst86
I dont mean to jack Ur thread, but is anyone aware of a set of heads that can be used on the 86 motors?? I'm running e7's right now.
I'm sure there are.even the years that have reliefs, those reliefs are not big enough to occupy some of the larger valves used.I don't know for sure but I would bet the twisted wedge heads have room for the valves.maybe not with a super big cam though
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Old 04-15-2012, 08:07 PM   #38
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My p heads dont have the holes for that hose. Do I have to drill some?
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Old 04-15-2012, 08:43 PM   #39
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that im not sure about.me peronallt i wouldnt worry about them.but im not sure if you would pass emmission withough it.idk

---------- Post added at 08:43 PM ---------- Previous post was at 08:11 PM ----------

it seems to be from a little googling,that some have the smog holes but are plugged with a heli coil. is there a helicoil in that area? i think that the p heada because of there improved burn from the better spark plug angle actually reduce emmissions.this may of maynot be the reason that some of the p heads didnt use the smog tubes.but anyways you may be able to drill them. i think i would delete it and hopefully it would pass emmissions.i dont know enough about emmissions to gurantee you this is the right way. http://fullsizebronco.com/forum/showthread.php?t=145609
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Old 04-15-2012, 09:00 PM   #40
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Would my e7 heads have had this tube on it as well?
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Old 04-15-2012, 09:19 PM   #41
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Yup
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Old 04-15-2012, 10:15 PM   #42
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So would my best bet be to put pistons from a later motor in this block?
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Old 04-16-2012, 07:37 AM   #43
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That would definitely give you a better chance of it fitting.but checking ptv clearance only takes 10 minutes.
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Old 04-16-2012, 07:42 AM   #44
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Quote:
Originally Posted by dreamstang
That would definitely give you a better chance of it fitting.but checking ptv clearance only takes 10 minutes.
+1 ptv clearence needs to be checked regardless what u run. Never know if someone shaved the heads to bump up compression ratio
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Old 04-16-2012, 09:47 AM   #45
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After doing the clay test how do I measure the clearance and what is tolerable?
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Old 04-16-2012, 10:10 AM   #46
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Ok what your gonna do.is clay the piston.I use playdoh from my kids lol.

now its best to do 1 valve at a time because if both valves touch the clay it could make your readings inaccurate.

I would put a minimum of 3/16 clay of the piston.

then bolt the head up.you can just use about 4 bolts and no need to torque them down all the way, just snug.

then set your pushrod checker and bolt up the rocker for the valve you plan on checking.if you have the proper pushrod then just use that.

then rotate the motor over by hand 2 turns till you get back to where you were , tdc.

Then unbolt the head.

Take the clay off very carefully.you can cut it in 1/4" slices so you can measure all parts of it.I would use calipers or mic to measure unless you can tell there is lots of room.

I forget the min recommended clearance is but I want to say around .120 on intake valve and .080 of exhaust valve

If you need a better instructions I believe we have this in the sticky section of Google.

Also if you don't want to buy the p rod checker.do this method with you 1.6 arms.then some simple math will tell us if your 1.7 will work or not.

Note : I installed tfs tw heads on mine.they said max lift around .540. I am running .516 .when I check I used almost 1/4 of clay and I never touched it. So my reliefs weren't even needed.plus I'm sure the stock piston reliefs wouldn't have accomodated my 2.02 valves anyways.
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Old 04-16-2012, 10:22 AM   #47
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Ok great I will do that and let you guys know what I got. Thanks I appreciate all the help
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Old 04-16-2012, 10:59 AM   #48
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Ok great I will do that and let you guys know what I got. Thanks I appreciate all the help
No problem.hopefully it all works out.
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Old 04-20-2012, 04:04 PM   #49
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I did my clay test and I got .100 intake and .08 exhaust. This was with stock rockers. Any thoughts?
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Old 04-20-2012, 04:06 PM   #50
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you have stock cam?
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Old 04-20-2012, 04:10 PM   #51
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No that was e303 cam
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Old 04-20-2012, 04:20 PM   #52
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i think you better stick with the 1.6. you are already pushing the limits. i dont remember the exact rocommendations but you may be exceeding them just a hair on the exhaust side.but IMO you should be ok with the 1.6, but i would recommend some good valve springs if you can budget them to help make sure you dont get valve float..but dont put in the 1.7 because that is gonna take away about .030 clearance on both valves.and you dont have room for that.
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Old 04-20-2012, 04:27 PM   #53
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Would my e7 heads have had this tube on it as well?
If they only do visual then delete it
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Old 04-20-2012, 04:35 PM   #54
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Yea it does seem really close. I've got the block tore down this far already. I may put the pistons from my 91 block in this one. A good idea?

---------- Post added at 05:35 PM ---------- Previous post was at 05:28 PM ----------

I plan on getting rid of that tube but I still need the smog pump. Maybe gut it out so at least it's still there?
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Old 04-20-2012, 04:36 PM   #55
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well there is no way to gurantee that the reliefs on the 91 piston are perfect for your heads. but i do think that there is a very good chance that it will help. i would hate to tell you yeah go ahead and the reliefs are not perfect for you valves and then you gain nothing. if it were me, i would try it. but your still gonna have to check ptv again just to be sure.
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