!!Questions About Head Upgrade, KA-t builders help!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

DriftinAndy · 04-02-2008, 12:48 PM

I got a few questions about upgrading my KA stock head. My car is in a shop right now the 1st and 2nd cylinders are EF'D up, i want to upgrade it so i can install a turbo later on. I want to keep it as a dialy driver, so i just want to have about 240-320hp. Im already going to port and polish the head. So my question is... What can i do to the head to upgrade it now so i can install a turbo later?? Any info on type or brands of cams,valves (stock or oversized) etc...
I never built a turbo'd car, so I dont have any experiance on building an engine for a turbo. I know there are some other things to do when i install a turbo, cuz 240-320 is a pretty wide range. Ill just tweek it later when i get a chance for the turbo.

Pacman · 04-04-2008, 06:38 PM

A lot of the aftermarket cams need to have the head clearanced for the bigger cams. They remove metal somwhere for fitment. 5-angle valve grind with oversized valves would help breathing. Search KA valves on google and you'll find what I'm talking about. If you are the one port and polishing make sure to flow bench the head. If you don't know what you're doing you can remove to much and have ill-effects or have unequal flows between ports/cylinders.

number80 · 04-04-2008, 07:21 PM

I'm building my setup too but I'm going to leave the head stock. Many people have made over 400hp on stock heads, some even with stock cams. I say with you only wanting to make 320hp just leave it stock and spend the money on something else.

***Future240*** · 04-05-2008, 03:30 PM

If you are trying to turbo the ka, ka-t.org is a good place for info. The whole forum is dedicated to it.

DriftinAndy · 04-07-2008, 12:25 AM

thanks for the info guys,..my buddy was telling me about letting it breath easier by porting it,..hes taking it to a machine shop to get it done, so yea i have know idea on doing that type of work...

Addicted2Kouki · 04-17-2008, 02:08 AM

If your goal is 240-320hp.
I would put that money towards the block instead of the head.

The piston rings are the main weak point in KA's when turboing.

98s14inaz · 04-17-2008, 10:24 AM

Quote:

Originally Posted by DriftinAndy

...so i just want to have about 240-320hp...

That's it? You can do that easily with the stock head, s13 cams, and some fresh valve seals. Spend your money on the bottom end, fuel, and engine management. P n' P wouldn't hurt though.

fromxtor · 04-27-2008, 05:43 AM

^truth

Forged pistons, rods, ARP HS, new bearings, gaskets you should be good. Stock head would be fine for your goals, but I would get a 3 angle valve job, and make sure your valvetrain is still within tolerences.

04-02-2008, 12:48 PM	#1
DriftinAndy Leaky Injector Join Date: Mar 2006 Location: ontario, Ca Posts: 136 Trader Rating: (0) Feedback Score: 0 reviews	!!Questions About Head Upgrade, KA-t builders help!! I got a few questions about upgrading my KA stock head. My car is in a shop right now the 1st and 2nd cylinders are EF'D up, i want to upgrade it so i can install a turbo later on. I want to keep it as a dialy driver, so i just want to have about 240-320hp. Im already going to port and polish the head. So my question is... What can i do to the head to upgrade it now so i can install a turbo later?? Any info on type or brands of cams,valves (stock or oversized) etc... I never built a turbo'd car, so I dont have any experiance on building an engine for a turbo. I know there are some other things to do when i install a turbo, cuz 240-320 is a pretty wide range. Ill just tweek it later when i get a chance for the turbo. __________________ "BEHOLD A PALE HORSE...

04-04-2008, 06:38 PM	#2
Pacman Zilvia FREAK! Join Date: Sep 2003 Location: Ohio Age: 33 Posts: 1,147 Trader Rating: (1) Feedback Score: 1 reviews	A lot of the aftermarket cams need to have the head clearanced for the bigger cams. They remove metal somwhere for fitment. 5-angle valve grind with oversized valves would help breathing. Search KA valves on google and you'll find what I'm talking about. If you are the one port and polishing make sure to flow bench the head. If you don't know what you're doing you can remove to much and have ill-effects or have unequal flows between ports/cylinders. __________________ In search of a Zenki S14 right side (passenger) fender and straight hood that are rust free.

04-07-2008, 12:25 AM	#5
DriftinAndy Leaky Injector Join Date: Mar 2006 Location: ontario, Ca Posts: 136 Trader Rating: (0) Feedback Score: 0 reviews	thanks for the info guys,..my buddy was telling me about letting it breath easier by porting it,..hes taking it to a machine shop to get it done, so yea i have know idea on doing that type of work... __________________ "BEHOLD A PALE HORSE...

04-27-2008, 05:43 AM	#8
fromxtor Post Whore! Join Date: Aug 2005 Location: NC Age: 40 Posts: 3,012 Trader Rating: (23) Feedback Score: 23 reviews	^truth Forged pistons, rods, ARP HS, new bearings, gaskets you should be good. Stock head would be fine for your goals, but I would get a 3 angle valve job, and make sure your valvetrain is still within tolerences. __________________ Seller feedback>>http://www.zilvia.net/f/showthread.p...light=fromxtor

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04-04-2008, 07:21 PM	#3
number80 Leaky Injector Join Date: Jul 2007 Location: Minnesota Posts: 100 Trader Rating: (0) Feedback Score: 0 reviews	I'm building my setup too but I'm going to leave the head stock. Many people have made over 400hp on stock heads, some even with stock cams. I say with you only wanting to make 320hp just leave it stock and spend the money on something else.

04-05-2008, 03:30 PM	#4
*Future240* Super Moderator Join Date: Jun 2007 Location: Places Age: 33 Posts: 12,711 Trader Rating: (17) Feedback Score: 17 reviews	If you are trying to turbo the ka, ka-t.org is a good place for info. The whole forum is dedicated to it.