I am concidering sending my ZC head when i get the motor to DH-racing.com to have them do the DOHC ZC head converion to LS head But i had a few questions first. These are questions that i sent to the company but I want hear from someone who has actually done this before.

What are the advantages to going from DOHC ZC to LS?
What kind of gains are we looking at?

If anyone knows about this please enlighten me a little

Thanks for your time.

 

bump

 

I didn't know it was possible to slap an LS head on a ZC block.

 

It's not actaully putting the LS head on the block but more like converting the original one to LS Check out DH-racing.com and go to the head packages page. They got some neat stuff.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90SICRX &raquo;</TD></TR><TR><TD CLASS="quote">It's not actaully putting the LS head on the block but more like converting the original one to LS Check out DH-racing.com and go to the head packages page. They got some neat stuff. </TD></TR></TABLE>


Ahhh, I see. I don't think you will see any major difference. Maybe the cams are a little more aggressive?

 

aahh, for 600 some dollars i was hoping to hear otherwise

 

What about flow wise? I have heard that the ZC head has a bad flow rate? Would this help in anyway?

 

DOHC ZC To LS Head Package

<FONT COLOR="red">This is the option all DOHC ZC Owners are raving about. With no valvetrain upgrades available for the ZC, we offer a way out. By line boring we allow the install of LS Valvetrain. This head packages recieves our full attention with competition port work, LS dual valve springs, and LS titanium retainers. Also, the head comes with polished high flow valves, resurfacing, and polished combustion chambers.
ALL Head Package Pricing Is In Addition To The Stock Ported Pricing.
This Package Is Also Available For The D16a1 Motor.</FONT>

I wonder if that allows you to use LS cams?

 

I was wondering that too, I had sent them an email and it said they would mail be back within 24hrs.......so i'm just waitng lol.

 

Cuase if it is possible, then you can get yourself a nice set of aftermarket cams.

 

now were talkin!

 

Quickest B16A in the world!!!
• 9.65 @ 142mph
• 9.82 @ 141mph
• 9.94 @ 139mph
i would trust these people


Modified by daidilus at 10:56 PM 5/13/2004

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by daidilus &raquo;</TD></TR><TR><TD CLASS="quote">Quickest B16A in the world!!!
• 9.65 @ 142mph
• 9.82 @ 141mph
• 9.94 @ 139mph
i would trust one people </TD></TR></TABLE>

huh?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by daidilus &raquo;</TD></TR><TR><TD CLASS="quote">Quickest B16A in the world!!!
• 9.65 @ 142mph
• 9.82 @ 141mph
• 9.94 @ 139mph
i would trust one people </TD></TR></TABLE>

wtf are you talking about?

 

You get a reply back from DH yet?

 

nope not yet, I sent them a mail this morning around 10 or so.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr. S &raquo;</TD></TR><TR><TD CLASS="quote">

wtf are you talking about?</TD></TR></TABLE>

ROFL!! After reading it many times, I still don't know what he's talking about.

 

The only thing i can think of is if he is quoteing a car from dh-racing? ah i dunno

 

Here's the mojo on LS valetrain into a ZC head:

Stem diameter of the LS valves are identical with ZC... .258" intake and .256" exhaust.

Overall length is identical for the intake valves.

Overall length is .050" taller for the LS... this is extra material above the valve keeper notch, and with a set of nasty cams would only help the poor valvetrain geometry associated with regrinds.

Here's the clincher:

- LS intake valves are 1.15mm O/S, and *weigh noticeably less* than ZC intakes.
- LS exhaust valves are 1.7 mm O/S, weigh noticeably more than the ZC units.

Stock ZC valveseats can be cut to accept LS valves.

If you look at LS valvesprings (stock are jokes) compared to ZC, the ZC are much stiffer, and there is only a .050" difference in OD which is where you have spring clearance problems with the head. ZC retainers are also a lighterweight piece than LS.

I don't have valvespring seat heights on hand, sorry.

If you can get installed heights of the LS springs vs the ZC stuff, any run of the mill machine shop can assist you in fitting LS valvetrain to a ZC head, for a LOT less than $600. I'd speculate JG's dual spring setup for the ZC would fit right in, otherwise you can dremel the .050" interference out of the head to fit the LS springs.

FYI, there is an OEM Honda intake valve that is a direct replacement for and 2mm O/S from the stock LS. The exhaust vales are the same size as LS, but don't have the stupid .050" extra height over the keeper (not 100% sure of this, haven't gotten all the carbon off the face to ensure overall height). I'm more than happy to share the info with anyone *after* I lay hands on 4-5 of these "junk" engines to ensure my own personal supply of valves. In the trailerpark, we reuse stuff whenever possible.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EL Vap133 &raquo;</TD></TR><TR><TD CLASS="quote">
DOHC ZC To LS Head Package
I wonder if that allows you to use LS cams? </TD></TR></TABLE>

LS camshafts are about 1 1/2" longer than ZC camshafts, so, unless there is some way to stretch the head out longer, they won't fit

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by J. Davis &raquo;</TD></TR><TR><TD CLASS="quote">Here's the mojo on LS valetrain into a ZC head:

Stem diameter of the LS valves are identical with ZC... .258" intake and .256" exhaust.

Overall length is identical for the intake valves.

Overall length is .050" taller for the LS... this is extra material above the valve keeper notch, and with a set of nasty cams would only help the poor valvetrain geometry associated with regrinds.

Here's the clincher:

- LS intake valves are 1.15mm O/S, and *weigh noticeably less* than ZC intakes.
- LS exhaust valves are 1.7 mm O/S, weigh noticeably more than the ZC units.

Stock ZC valveseats can be cut to accept LS valves.

If you look at LS valvesprings (stock are jokes) compared to ZC, the ZC are much stiffer, and there is only a .050" difference in OD which is where you have spring clearance problems with the head. ZC retainers are also a lighterweight piece than LS.

I don't have valvespring seat heights on hand, sorry.

If you can get installed heights of the LS springs vs the ZC stuff, any run of the mill machine shop can assist you in fitting LS valvetrain to a ZC head, for a LOT less than $600. I'd speculate JG's dual spring setup for the ZC would fit right in, otherwise you can dremel the .050" interference out of the head to fit the LS springs.

FYI, there is an OEM Honda intake valve that is a direct replacement for and 2mm O/S from the stock LS. The exhaust vales are the same size as LS, but don't have the stupid .050" extra height over the keeper (not 100% sure of this, haven't gotten all the carbon off the face to ensure overall height). I'm more than happy to share the info with anyone *after* I lay hands on 4-5 of these "junk" engines to ensure my own personal supply of valves. In the trailerpark, we reuse stuff whenever possible. </TD></TR></TABLE>

Wow ok so what are you saying in a nutshell that half is not as good as the LS and half of it is better?
Also I was talking to a guy over at theZCR.com and he refered me to theoldone.com and said that the guys there can hook me up with some nice stuff for the ZC head to make it flow a lot nicer and get some horses out of the head as well. Does that sound better then trying to do an LS conversion?

 

The TOO board has a lot more ZC tech than anywhere else. Go to their forums and do a search, you'll be very pleased. If you wished to purchase services relating to headwork or packages for the ZC, I'd take my **** to Larry Widmer who owns/is Endyn. I poke a bit of fun at him about his blower kit that will never see the light of day, but much respect to his knowledge.

If you wanted to do a budget build, the above info will help you along. I dunno about you, but LS heads get thrown/given away by the VTEC guys all the time. A set of valves shouldn't be hard or expensive to come by.

 

sounds good, I'll keep you posted then on whats going on

 

Calling a company in baltimore today to see if they have any ZC DOHC's in stock other wise I have a guy from Cali that will sell me one but i'm not all for paying shipping on that mo fo.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90SICRX &raquo;</TD></TR><TR><TD CLASS="quote">Calling a company in baltimore today to see if they have any ZC DOHC's in stock other wise I have a guy from Cali that will sell me one but i'm not all for paying shipping on that mo fo.</TD></TR></TABLE>

try these guys in Manassas Park, Virginia
http://www.japanstarmotor.com/