well, i'm looking at buying a high mileage 90-93 teggie. i'm planning on swapping to a b20z/b. i want to go all motor/nonvtec, and i've heard the LS heads flow better than b20 heads, so would it work to put the LS head on the b20 block?

anyone done this/have any opinions/advice?

 

Just build up the LS.

 

i was also thinking on going that route, but i need a spare motor in there while the LS is being built (only car i'll have)

think i should just try to find a cheap reliable long block>

 

Who ever told you that the LS head Flows better than an CRV head needs to be crossed off your christmas list........there is no differance betwwen the two heads.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RedZone &raquo;</TD></TR><TR><TD CLASS="quote">Who ever told you that the LS head Flows better than an CRV head needs to be crossed off your christmas list........there is no differance betwwen the two heads.</TD></TR></TABLE>

really? i thought i read it on here a while ago...i thought that at least the cams had different profiles???

oh well, i'll just put the LS intake manny on there and call it good if that's the case

 

The heads are the same, so you can use either one. The intake manifolds are different, the CRV is taller then the LS. As for the cams I would have to say that there might be some difference because most B20s come automatic and I know that automatics have a different profile over a car that is a 5sp.....for example the B16 auto and 5sp have different profiles, so it might be safe to say that the CRV and LS could be different. If you like and if I have some time ill Measure them and see what the profiles are.

 

97-98 B20 & LS cams are the same 10.03mm-IN/9.70mm-EX
99+ B20 intake cam has .3mm more lift than the above.

 

im goin on the same path.. i have to say if u goin to get 90-93 teg.. get crower 403 cams, &p the LS head, p&p b18b intake manifold, itr fuel rail and throttle body, AEM cam gears, b16a pr3 pistons for some 12:1 compression.. and slap on GSR transmission.. but that just my theory..

 

GSR trans? you mean 92-93, or are you talking a hydro clutch conversion to fit a 94+?


b20 heads have a larger combustion chamber cuz the bigger bore. They flow the same. I would put a b20 in the LS and throw some p75 cams in it with a skunk2 IM.

 

I wouldn't use a B20 head on a LS block because the combustion chamber on the b20 head is a little bigger than the LS 81mm bore. This is causes detontation like you won't believe.

 

I was under the impression Honda did not open up the combustion chamber on B20B/Z heads?

 

You are correct. They are 81mm just like the LS heads.

Rocket, what measurement are you getting in the B20 heads?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sleeper &raquo;</TD></TR><TR><TD CLASS="quote">You are correct. They are 81mm just like the LS heads.

Rocket, what measurement are you getting in the B20 heads?</TD></TR></TABLE>

I have a B20B head and the combustion chamber matches the B20B head gasket so that suggest the chamber is 84mm in diameter.

 

this makes sense.

also by using the b20 head you would LOSE your compression points slightly. due to the bigger chamber of 84mm rather then 81mm.

 

All the ones I have seen have the 84mm gasket but only 81mm chambers.

 

Cool. I'll take some pics of my B20 head. I forgot the code on the head but it's not the same code like a LS head.

 

I wonder if there is a difference in production years. Or maybe JDM vs USDM. Cool find, keep us updated.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sleeper &raquo;</TD></TR><TR><TD CLASS="quote">I wonder if there is a difference in production years. Or maybe JDM vs USDM. Cool find, keep us updated.</TD></TR></TABLE>

That's what I am thinking too. I have the JDM head.

 

LS and B20 heads are the same, including combustion chamber. JDM and US just about any year.

&lt;-----LS Specialists

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RedZone &raquo;</TD></TR><TR><TD CLASS="quote">Who ever told you that the LS head Flows better than an CRV head needs to be crossed off your christmas list........there is no differance betwwen the two heads.</TD></TR></TABLE> i head that b18b head will add 10 hp to with a b18a block...true?

 

It could be true since b18a's have 130hp and b18b's have 142.
It could just be the cam profile.

 

its more the intake manifold and cams that are different in the b18a and b.

as far as the b20 head im pretty sure its the same casting so the same bore. ill check my spare b20 head when i get home. aso just a interesting tidbit some jdm b20's have 33mm intake valves (the same size as vtec)

 

the heads are the same

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by md23vtec &raquo;</TD></TR><TR><TD CLASS="quote">the heads are the same </TD></TR></TABLE>

That can't be true. I have a USDM B18a head, a JDM B18b head (P4E) a 98 JDM B20B head (P8-R off of a P3F block) and this week I have a 2000 JDM B20b (A PHK block) coming.

Out of the 3 engine heads I have, all three have different part codes.

 

Could you measure the combustion chamber diameter and the intake valve size on the different heads you have?