GT-40p heads on a 86?

LilBerx

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#1

• Apr 9, 2012

• #1

Will p heads work on a 86?

 

LilBerx

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#2

• Apr 9, 2012

• #2

Let me re-word this better, will the flat tOpped pistons work this gt40p heads? If so, what compression would they be at?

 

NIKwoaC

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#3

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• #3

You would very likely have piston-to-valve clearance issues.

 

hoopty5.0

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#4

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Could always break out the Play-Doh and see if it will clear or not. Also depends a lot on what cam you are running.

 

NIKwoaC

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#5

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hoopty5.0 said:

Could always break out the Play-Doh and see if it will clear or not. Also depends a lot on what cam you are running.

Click to expand...

+1

 

stykthyn

I want to measure mine. It doesn't look that tall.

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#6

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• #6

If youdont have the clearance you can fly cut your pistons

 

LilBerx

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#7

• Apr 10, 2012

• #7

What cam would be best suited for this setup? it would be with a explorer intake setup, no smog. I think i may have read somewhere that a B303 would work?

On the other hand, i also heard something about valve relief?

 

hoopty5.0

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#8

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Valve reliefs - Hah, some guy on theturboforums bought a valve and glued an abrasive disk to it and trimmed the excess. He put the valve in the head, bolted it down, put a drill on the valve stem and went to work.

Voila, homemade valve reliefs, lolz.

 

Noobz347

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#9

• Apr 10, 2012

• #9

LilBerx said:

What cam would be best suited for this setup? it would be with a explorer intake setup, no smog. I think i may have read somewhere that a B303 would work?

On the other hand, i also heard something about valve relief?

Click to expand...

I would reuse the OEM 86 cam. It's no slouch (it had to make up for those crappy OEM heads) and it already sounds mean. That should also alleviate any clearance problems you might otherwise have though you SHOULD still clay it up to be certain (honestly, for that combo... I'd bolt it on and rotate by hand... if eveything is good then press on with pride).

 

Mr. Rustypwnz

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#10

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• #10

you wont hit anything with a b cam.

 

Noobz347

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#11

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... and you won't make any more power than you would with those heads and intake either. The added advantage is that you can also reuse your speed density system.

 

LilBerx

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#12

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When I do the head swap, It will be getting MAF.

 

Noobz347

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#13

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LilBerx said:

When I do the head swap, It will be getting MAF.

Click to expand...

Sky is the limit then. Get with Rick 91GT and get a cam recommendation.

 

NIKwoaC

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#14

• Apr 10, 2012

• #14

If you put those heads on an '86 shortblock without properly checking clearance, you might at well have a good backup plan because you will almost certainly grenade it. Stop fiddle dicking around with those archaic junk iron boat anchors and just buy a set of Twisted Wedges. T-dubbs are practically guaranteed to clear and you'll actually be able to run a decent cam instead of that letter cam garbage.

Lemme tell you how I really feel... Haha.

hoopty5.0 said:

Valve reliefs - Hah, some guy on theturboforums bought a valve and glued an abrasive disk to it and trimmed the excess. He put the valve in the head, bolted it down, put a drill on the valve stem and went to work.

Voila, homemade valve reliefs, lolz.

Click to expand...

I've actually seen that method done a few different ways with success. If you keep the grit from getting down into the engine and you don't botch up the valve seat/guide, it seems to make perfect sense to me...

 

Gearbanger 101

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#15

• Apr 10, 2012

• #15

hoopty5.0 said:

Valve reliefs - Hah, some guy on theturboforums bought a valve and glued an abrasive disk to it and trimmed the excess. He put the valve in the head, bolted it down, put a drill on the valve stem and went to work.

Voila, homemade valve reliefs, lolz.

Click to expand...

Had a buddy do something similar. He actually cut a notch into a spare valve he had laying around. Turned it into sort of a "blade" I guess? Took his time, added a lot of WD40 to the guide while he cut. Worked pretty well.