4AC Head on 20V S/T Block?!?!

AidoKsev
Posts: 5
Joined: Wed Feb 13, 2013 2:58 am

4AC Head on 20V S/T Block?!?!

Postby AidoKsev » Wed Oct 09, 2013 2:04 am

Hey guys, recently my car got defected (I'm in Australia) for having a 20 Valve motor in my KE70, and I cannot get it over the pits as it has too much powahhh, therefore it has to be certified by an engineer, which is a minimum of six to eight weeks before anyone can come and sign off on it. However it is legal to have a 4AC in there due to the fact they came factory with them. I'm just curious, has anyone tried putting a 4AC head on the Silvertop 20V block?? I know it sounds stupid but it would be super cool if I could get away with it without having valve clearance problems! Then they will record the 20V engine number off the block and I won't need any engineering if I get defected again!

Any help on this topic is appreciated!

Cheers, Aido.

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grappletech
Club4AG Expert
Posts: 344
Joined: Sat Jan 12, 2013 12:13 pm

Re: 4AC Head on 20V S/T Block?!?!

Postby grappletech » Wed Oct 09, 2013 10:01 pm

I have never heard of this, I have seen a 4ag head on a 20v block though
87 GTS Coupe Super Duper Clean
87 GTS Coupe Beams 3sge (under construction cuz I'm slow and lazy and broke-FML)
87 SR5 Coupe Shell. (Sold)
86 SR5 Hatch Shell (waiting on a 20v or BEAMS to come cheaply. hell maybe even a 4agze?!)

poorutron
Club4AG Enthusiast
Posts: 145
Joined: Mon Jan 21, 2013 3:21 pm

Re: 4AC Head on 20V S/T Block?!?!

Postby poorutron » Mon Oct 28, 2013 12:43 pm

yeap its been done check out user "mesh on my rolla" his SR5 currently rocking the setup your describing (and them some other mods onto it lol) a definite 4ag killer

8Ton
Club4AG Regular
Posts: 40
Joined: Sat Mar 02, 2013 5:16 pm

Re: 4AC Head on 20V S/T Block?!?!

Postby 8Ton » Thu Oct 31, 2013 8:14 am

The 4AC head has 32-33cc chambers vs silvertops 35-36. The AC chambers could be deshrouded, which would help flow and keep your c/r manageable. If this is going to be a long-term fix, I would look into portwork, a better intake mani and a reground cam to bring back some of the fun. Good luck!

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