GTE Head on GE ?

[86yota]

I have been looking for a good head and now i found one that is a complete rebuilt w/cams but wanna be 100% sure i can use it. my ride is 86.5 w/a 87 7mge rebuild the bottom end to stock.

so i have been searching around and i have found that the only difference between the two are the cams and cam gears.

But i also read somewhere that two water jackets do not match.
was also told that the runners do not watch also.

I also heard that i would have better top end from this swap. ?

Like i said i just wanna be sure before i spend $400 bucks on it.

thanks for any help in advance.

 

[shaeff]

Cam gears are identical. Intake cams are different. All else is the same.

 

[webbs7mgte]

shaeff hit the nail on the head. Intake cams on the GE have bigger lobes thant he GTE

 

[86yota]

thanks shaeff ...So do think the intake cam will make a difference in basic performance? or should i swap it out.?

is more lobe better? I would think so a bigger lobe would mean it keeps the valves open a little more which in turn it put more air in the cylinder would i have to put more fuel in their also.?

like i said i plan on swapping my old out with this one and hope everything matches up easy.

 

[CRE]

You'd want to swap in a GE intake cam.

 

[86yota]

You'd want to swap in a GE intake cam.

ok thanks just the one ? or should i do both ?

Getting excited to have my baby back to spec. :icon_bigg

just gotta get a good head Gasket and iam gtg

 

[Nick M]

shaeff hit the nail on the head. Intake cams on the GE have bigger lobes thant he GTE

Since Toyota says the GTE has a higher lobe lift, got any info on duration at .050"? Since this cam doesn't have a roller follower or tappet, it can't be much steeper.

 

[BLACKCAT]

Yes the turbo intake cam has slightly larger lift & 10 degrees more duration.
You will loose a bit down low but pick it up at the top end, been there done that.....
Dont forget to check that the valve clearances are within spec.

Valve lift @0.05 is 0.297" but I have been unable to find the actual duration for the stock Toyota cams.

 

[Poodles]

Nick beat me... GTE has more lift per the TSRM...

 

[shaeff]

I HAD info somewhere about this. Something along the lines of GTE= more lift, GE= more duration. But since I cannot find that info at the moment, don't quote me on it.

 

[Poodles]

Main thing to remember is Toyota spent the money on two different cams for a reason

 

[CyFi6]

good point but theres always the question of what was the reason?

 

[Nick M]

good point but theres always the question of what was the reason?

If you don't know why, you shouldn't change them.

 

[86yota]

If you don't know why, you shouldn't change them.

thanks everyone for the info.

So we know that the GtE cams are bigger and have more lift. but like CRE said swap the intake cam Or leave it in?

Would it depend on if i wanted low end power over high end? or does it mean swap it or i could damage somthing?

one guy from toyota in my area told me that i just had to swap both cams out its a must.

been on the phone with toyota people all morning.

 

[CyFi6]

If you don't know why, you shouldn't change them.

And i wouldnt, but i do want to know. Does anyone know? Anyone care to explain?

 

[86yota]

i guess the question is if there are any mechanical advantage's from having GTE cams on a GE block. beside the higher top end or any major disadvantages.

Either way iam gunna swap them if mine a 100% if not ill have to buy new ones.

 

[shaeff]

So we know that the GtE cams are bigger and have more lift. but like CRE said swap the intake cam Or leave it in?

Would it depend on if i wanted low end power over high end? or does it mean swap it or i could damage somthing?

one guy from toyota in my area told me that i just had to swap both cams out its a must.

I'd swap the GE intake cam in, otherwise you'll be seriously lacking on bottom end power in the GE. Nothing would be damaged.

The Toyota guy in your area is wrong. You can swap out one or the other with no problems. It's not a must.

It's not worth the trouble to swap GE cams IN a GTE motor, but if you're N/A, I'd put the GE intake cam back in there.

So in short, yes, put the GE cam back in the head if you're N/A.

 

[86yota]

thanks shaeff for clearing all of that up, i like said i will just use my Ge intake cam The Exhaust Cam has a small chip in one of the rear lopes.

we checked it with a digital meter and chip did not throw off shape of the lope so i stuck it back in..that and along with the stupid stupid fact that i did not re torque my head bolts, and the final. That head had 160,000 on i when i put it in another stupid mistake...its all be a learning process...

 

[Nick M]

thanks everyone for the info.

So we know that the GtE cams are bigger and have more lift. but like CRE said swap the intake cam Or leave it in?

Would it depend on if i wanted low end power over high end? or does it mean swap it or i could damage somthing?

one guy from toyota in my area told me that i just had to swap both cams out its a must.

been on the phone with toyota people all morning.

The exhaust cams are indentical. Same part number. So, whomever told you change both, you can now discount everything else said. I am kidding about discount everything else he said.

You won't damage anything. The 7MGE and 7MGTE are not different engines. They are the same. The GTE was altered slightly to acomidate the blower. Like the regrind on the intake cam. And the cooler circuit and lower compression piston.

i guess the question is if there are any mechanical advantage's from having GTE cams on a GE block. beside the higher top end or any major disadvantages.

Either way iam gunna swap them if mine a 100% if not ill have to buy new ones.

No advantage. You would need a screaming motor to run into a problem with the slightly different timing.

New is good, they do wear.

 

[86yota]

The exhaust cams are indentical. Same part number. So, whomever told you change both, you can now discount everything else said. I am kidding about discount everything else he said.

You won't damage anything. The 7MGE and 7MGTE are not different engines. They are the same. The GTE was altered slightly to acomidate the blower. Like the regrind on the intake cam. And the cooler circuit and lower compression piston.



No advantage. You would need a screaming motor to run into a problem with the slightly different timing.

New is good, they do wear.

thanks for shareing your ...but after thinking and doing more research i found a complete rebuilt head with the right cam i need for $400 bucks plus $20 for shiping and it comes with a 1 year warrenty unlimited mile cant beat that.


i was gunna buy one off a supra forums member for $400 with no warrenty glad i kept looking.