4age head swap, Worth it? Options

[BigJ]

Ok another question i have about fixing up my 7afe is this: I found most the HP internals as far as the bottom end is concerned but what about the top end. I looked into the 4age head swap but that seemed like a bunch of crap. Changing to 4a pistons and all that other mess. The "G" head is toyotas performance head right. Couldnt i just make my "F" head a performance head? I mean whats the real big difference between the heads. Wouldnt it be easier to rebuild the head i have with some performance parts like valve springs and lifters and stuff (if any are availabe for the 7a). Then have bigger cams or have my existing cams shaved and then do a port and polish. Never really worked with heads much so this is not my forte. Lemme know what you guyz think....

This post has been edited by BigJ: Dec 1, 2004 - 4:04 AM

[macavely]

Ok another question i have about fixing up my 7afe is this:    I found most the HP internals as far as the bottom end is concerned but what about the top end.  I looked into the 4age head swap but that seemed like a bunch of crap.  Changing to 4a pistons and all that other mess.  The "G" head is toyotas performance head right.  Couldnt i just make my "F" head a performance head?  I mean whats the real big difference between the heads.  Wouldnt it be easier to rebuild the head i have with some performance parts like valve springs and lifters and stuff (if any are availabe for the 7a).  Then have bigger cams or have my existing cams shaved and then do a port and polish. Never really worked with heads much so this is not my forte.  Lemme know what you guyz think....
[right][snapback]215150[/snapback][/right]

ok to help you out on this a bit.. NO.... the F head is toyota econ head.. there isn't much you can to to it.. and the very few things you can won't help much... this topic has been cover on here more then once... do a searh and you will find all the answer you need.... i would explain it to you but for some reason my barin isn't working right at this time at nite.. damn i need a red bull bad..

[Hanyo]

the difference between the g head and the f head is the over all design.

the vavles are angled more flat on the g head so the flow is better. while the f head has more of a steep angle. think of it this way. the air has to go into the engine and then make a 180 degree turn to come back out on an f head.. where as the g head is like two open doors oposite from each other. the air just passes through both the doors and comes out.. this is a VERY butchered version of what is happens.


so if you add all those parts like valve springs and port and polish to the F head .. the air still has more resistance traveling through the head compared to the G head.


i hope i got the idea right.. someone correct me if i am wrong.

[Dr_Tweak]

the difference between the g head and the f head is the over all design.

the vavles are angled more flat on the g head so the flow is better.  while the f head  has more of a steep angle. think of it this way. the air has to go into the engine and then make a 180 degree turn to come back out on an f head.. where as the g head is like two open doors oposite from each other. the air just passes through both the doors and comes out..   this is a VERY butchered version of what is happens.


so if you add all those parts like valve springs and port and polish to the F head .. the air still has more resistance traveling through the head compared to the G head.


i hope i got the idea right.. someone correct me if i am wrong.
[right][snapback]215164[/snapback][/right]

Yeah you basically got it. The valve angle is a lot different. Not to mention that the cams run off one sprocket so you can't tune them seperately. And the ports are really small... etc etc etc

So the answer is no, you can't really fix up the F head. Get yourself a G head or a complete 4AGE.

This post has been edited by raven_101: Dec 3, 2004 - 2:14 AM

[GTAlmond]

Has anyone done the 4a-GZE swap with the supercharger? Im really looking into doing that.

Anyone with first hand experience?

also how much should it cost?

I was looking at buy an engine for about $800 that has all the head and super charger, but, i think it would just be cheaper to buy the parts.

Anyone?

GTAlmond

[celicarocker]

as far as i know nobody has completed a 4agze swap.... john came the closest as far as i know, but gave up....

[Coomer]

Yeah, John's engine was in the car and installed and everything, but wouldn't start and idle correctly. Kwanza thinks he may have had a bad engine. John got it from Jarco, but Jarco can't get everything right all the time.