What are the difference in 1st gen and 2nd gen b16 heads?

1. Intake manifold
2. Camshaft profile is weaker on 1st gen

anything else?

 

valve cover and i think thats it

 

anyone know how to check what year the block is?

 

first off, you can tell a 92+ B16A/PR3 head from an 89-91 by looking for this '30' tag on the topside of the head near the vtec solenoid:


There's also a year stamp right between the #4 & #3 exhaust cylinder ports seen here:

(hmm I think its about time to make a new diagram of this pic)

Yes, the manifolds differ from 89-91 and 92-95. There's less b.s. on the 92+ manifolds vs. the 89-91's. They look cleaner too.

...the valve covers differ slightly. 92+ PR3 heads have VTEC in a larger font, 89-91's read VTEC in a smaller font.

The coolant passages flow differently in the 89-91 vs. 92-95 PR3 heads, but this is really nothing to grovel over.

Some of the Auto 89-91 PR3 heads do NOT have dual valvesprings. I have yet to find out if 92+ PR3 Auto heads have the same.

... thats all i can think of right now...

 

"first off, you can tell a 92+ B16A/PR3 head from an 89-91 by looking for this '30' tag on the topside of the head near the vtec solenoid:"

My 91 has the 30 stamp, so maybe true from 91+?????

I thought 89-91 also had cast cam rails, but my 91 has machined like the 92+

The best method in my opinion is to use the date stamp. It could still be rebuilt with 2nd gen internals though.

hth,

Monty

 

You probably have a 92-93 cable B16A engine, or late 91, which is actually an OBD1 equipped engine found in the JDM 92-93 DA/Integra XSi/RSi.

remember when newer production models come out, its almost always presented towards the end of an old year and beginning of new year. ie. JDM EG civic SiR came out in late 91 but is actually a '92 model.


[Modified by Katman, 10:24 AM 8/16/2002]

 

I think I might have gotten cheated out of my money or something.... i had a shop do my swap and afterwards my friend took a look at the stamp on the block which read "91" as in 1991. The shop claimed it was a 94 jdm motor.

I have the 2nd gen intake manifold, and a hydro tranny but is it possible that the motor itself is a 1st gen? Or even a 1st gen head and a 2nd gen bottom end?

Is there a way to find out what year the bottom end came from?

I just want to know what i have... it runs great but i just need to know whats under my hood.

 

well the only real way is to take off the head and look at the pistons tops for a 'P30' part number. if it's p30, then you have a 92+ B16A engine. Its hard to distinguish the block by year, even with the serial number, just by looking at it.

you might have an early 2nd gen B16A though, since those started in late 91.

 

heheh...saw the thread and i thought it was u, and i checked ur profile. im on my friends name cuz the ****'s here banned me for soem stupid ****, but o well.

yea, we'll have have to pull ur valve cover off to see if u have the extruded oil rails, that should be a dead give away.

but like kat man said, u could have a 92+/2nd gen head/engine, but the stamp says 91 cuz thats when they start production. i dunno, i wouldnt worry so much unless u can get some $$$ back from those *******, which i highly doubt anyway.

 

Checked mine out some more. PR3 pistons, and I also have the milky white plugs. Did the early OBD1 motors have a grey plug?

 

no, only 92+ B16A engines are grey plugged. All of the faded white/yellowy plugs are 89-91 B16A engines; with PR3 pistons.