Lets do this. Can you break down every difference between these two pr4 heads besides the valve train and stamp/casting marks? Thanks in advance.

pr4-5 off my '93 b18a1


pr4-1 off my '94 b18b

 

i know from a post hybrid vtec made, that the ones that say pr4-y have larger ports...when i read that because both of my engines have them

by the way what does the year marker on the pr4-5 head say...it looks like it says 9/9...meaning its off a 2000 b18b.

 

Theyre both stamped 93.

What years is the pr4-y from?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by whoa its len 2 &raquo;</TD></TR><TR><TD CLASS="quote">Theyre both stamped 93.

What years is the pr4-y from?</TD></TR></TABLE>

i believe they are from 94, but my 93 ls engine has one.

 

yes wut years are the pr4-y heads from? i have one sittin in my room. can somoene gimmie some more info on it?

 

TTT somoene gimmie some info

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by integra_dude &raquo;</TD></TR><TR><TD CLASS="quote">yes wut years are the pr4-y heads from? i have one sittin in my room. can somoene gimmie some more info on it?</TD></TR></TABLE>

i have 93 and a 94 one....talk to hybrid
_vtec he has info on them...hes the one i got my info about them from,

 

all '92+ integra non-VTECs have the larger ports, cams, intake manifolds, and throttle bodies. it's just the '90-'91's that got screwed. just like the '86-'87 tegs got robbed b/c the '88-'89's got better hardware and a resulting 10hp bump, much similar to what happened to 2G non-VTECs. all 3G non-VTECs got the newer hardware, too.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95lstegman &raquo;</TD></TR><TR><TD CLASS="quote">all '92+ integra non-VTECs have the larger ports, cams, intake manifolds, and throttle bodies. it's just the '90-'91's that got screwed. just like the '86-'87 tegs got robbed b/c the '88-'89's got better hardware and a resulting 10hp bump, much similar to what happened to 2G non-VTECs. all 3G non-VTECs got the newer hardware, too.</TD></TR></TABLE>


hrm imma have to look into that, because hybrid meassured his ls head . on his built b18b to his pr4-y and he found the ports were alil larger, the pr4-y if im correct is the new head on his build

 

bump for some love. anyone have accurate measurements of the intake/exhaust ports of different years?