92 SOHC heads into 95 SOHC

[rubble2269]

Can I use my 92 SL SOHC Heads (only the Heads) in my 95 SL1 SOHC.

Both are automatics.

Thank you.

[yaz4real]

From:
http://www.saturnfans.com/forums/showthread.php?t=88699


Heads:
The '91 DOHC head is a freakshow-leave it alone.
91-94 Heads interchange. (compatible with any year block.)
95-98 Gen2 heads - Linear EGR valve, otherwise compatible with 91-94 heads. Compatible with any year block.
99+ Gen3 Heads are NOT compatible with older heads. Completely redesigned. Compatible with any year block.
2000 (or 1999?) - 2002 Have the roller-rocker design with the small ports.

95 Heads do not interchange with any other year correctly. While yes all the heads up to 99 will interchange physically they will not have proper electronics and egr connections. The 95 head is the first year of the electronic egr valve. And the head has two coolant temp sensors. Now the 91-94 had a vacuum controlled egr valve and also had two coolant temp sensors. The egr mount is completely different between the vacuum and the electronic. Now the 96+ heads also came with the electronic egr valve but they only had one coolant temp sensor due to the fact that 96+ years went to the obd II pcm and only called for one coolant temp sensor.

'91-'94 heads can be adapted to later year engines and use the new style EGR valve if you get the adapter from Saturn that was used on 1994 DOHC cars sold in California, Part#21006753

You can use a '95 DOHC head all the way up to '98 all you have to do is buy one extra temp sender and screw it in the "spare" hole. Alternately, you can install the sender from an Autometer electric coolant temp gauge-it's a direct fit.

[sierrap615]

the info is (mostly) correct for the DOHC engines, but not the SOHC.

the 95 SOHC is MPFI, the 92 SOHC is TBI. different type of fuel injection, different manifolds, different wiring, different PCMs. you would have to swap all of that. and the 92 PCM wouldn't work(different gear ratios and crank trigger timing), i think the 94 PCM(and wiring) would work, it has the right trigger style, but the gear ratios might be different, not sure. and after all that work, you would lose 15 HP. i'd rather find a 95 head.