Is this possble....????? - Toyota Nation Forum : Toyota Car and Truck Forums

Twincam16 · 08-10-2002, 02:45 PM

Can you put a 20 valve 4AGE head to a 16 valve 4AGE block???

Norm

Deep · 08-10-2002, 09:09 PM

yeah you can, i read it on club4ag the other day, but I don't think it would be worth all the work. jmo, of course.

majicmeow · 08-10-2002, 10:53 PM

oh yea, is it EVER worth the work =) Why do you think they made the 20V head, to NOT put them on 4AG's?

An AE86 with 4AG and a 20V head, naturally aspirated can outperform an IS300... its increddible!

Deep · 08-11-2002, 09:26 AM

And a modded 4AGZ wouldn't?

majicmeow · 08-11-2002, 12:18 PM

Of course it would kick ass, that wasnt my point though. To swap in a GZE and mod it up would cost just as much, if not more than it would to just do a 20V swap. Not to mention the labour involved in the engine swap...

My point was that a 20V head is the easier job to perform, and for the money its a better deal.

Deep · 08-11-2002, 03:21 PM

Ok man, whatever you say.

gtfourdreams · 08-12-2002, 03:26 AM

a better deal? well it depends what you wanna do.

mr_sinister · 08-12-2002, 08:59 AM

you might as well just swap a whole 20V engine.. what's the point of swapping the head? unless you happen to have a set of 20V pistons lying around and a 20v head for cheap..

wunderboy · 08-12-2002, 09:56 AM

You would still need to change the ECU... just for the 20v head right, what else, I mean how much more work is there?

goodcookiedrift · 08-12-2002, 10:16 AM

why would you want to do that? the bluetop block is the weakest out of the bunch and the red top high comp block is pretty much the same as the 20v?

seems kind of pointless to me.

Nick

mr_sinister · 08-12-2002, 02:11 PM

yeah exactly.. as i understand it, the 20V block is a 7 rib block, like the redtop or gze.. but it uses a different crank, rods (?), and pistons..

so you wuld have to take the 16v head off, change to 20V pistons (which probbaly wouldn't even work on a blue top, the piston wrist pin size is probably wrong) then bolt the head back on,..

you would still have to worry about the dizzy/firewall problem, still have to either replace the ecu and wiring harness with the 20v versions or get aftermarket ecu, still have to fab those waterpipes and all that other fun stuff..

just do a "normal" 20v swap.. its probalby LESS work..

cacrawfo · 09-06-2002, 04:28 AM

I agree...... You would need more than just the head to make it work well..... Physically, the 20v head will "bolt" to the 4a block, but consider you need the proper distributor, and it is the 3sgte style, with G-, Ne, etc unlike the regular NA distributor. Thus, you cannot run it easily with a regular 16v ECU. Remember that the radiator/heater piping is all different as well. The 20 vavle uses 4 seperate throtlle bodies, and the idle control is with an ISC valve, like the GZE and 3SGTE. That is another issue, you cannot control the ISC with a regular US 16valve ECU....

My suggestion, get a complete 20v with wiring harness, AFM, and ECU. Since they were never used in a US model car, the engine importers that get stuck with them sell them cheap... A good importer is SOKO American..... if calling the Franklin Park office in the Chicagoland area, ask for Cheston, he is a Toyoto-phile!

Carl C www.speed-source.net