bradyg

hi i was wondering what heads would work on an 82 turbo i have heard that alot of people like the n42 but will that work on a turbo

lww

Yes. It will work, but you're better off with a P90.

My N42 has been heavily worked but it helps with the low end off boost torque with the smaller combustion chamber in the N42.

hoov100

i love my n47, even though it has liners i still picked up a considerable mount of HP/torque

duowing

So you guys are saying that the F54 block with N47 heads will actually help you torque/HP wise? Moreso than the F54 Block/heads?

jfairladyz

The P series heads outflow ANY of the previous heads (in stock form). On a turbo application I'd stay with the P90/a heads. You don't need any more compression but you'll want all the flow you can get. The P series heads have larger combustion chambers so a lot of the NA guys dont like to use them. But they also have the larger valves, which is a plus. There is a reason Nissan developed this head specifically for the turbo motor The P series heads had a very good quench area and are less prone to detonatin then the other heads.

And the N47 is actually one of the least desirable heads. Their exhaust flow is way too low in comparison to the intake flow. They are also prone to exhaust seat cracking more so then the other heads.

The N42 head is a great head for an NA motor.

NismoPick

Good... but yours isn't a turbo setup right?

hoov100

more of a high C/R setup. and nismo, it still gets me moving faster then the punks in there hondas.

NismoPick

I was just saying that because Brady is talking about a turbo setup, but very good!!! Show them wussy Honduh drivers what up!

hoov100

the n47 doesnt do as bad as most people would say either, if only i knew how to remove liners.

jfairladyz

The P79 heads are plentiful and they flow well even with the liners in them. Shave em down just a little bit and you've got your compression back plus all the benefits of the later head.

bradyg

well i think she mighta over heated a lil bit so i think i might just pull the motor and rebuild it and make sure i didnt mess anything up too bad (i dont think it would hurt to do a rebuild considering the age of the car) does anyone have ideas where i could get a good kit? performance kit or stock kit which ever

hoov100

i wouldnt rebuild an engine because of its age, more of how many miles/abused it has/was.

bradyg

like i said though it was over heated not bad but wouldnt hurt to see if i scored the piston or something

lww

Even then, just pull the head off and check the cylinder walls. If they're not galled and has good static and leak down compression, it doesn't need rebuilt.

I've seen 250,000+ mile L motors that didn't need rebuilt and still had the original factory cross hatching on the cylinder walls...

With proper maintenance, these things were made to last forever. Remember, Mr. K wanted to build something that was as fun as the Germans and Brit's with NONE of their reliability issues.

Although that engineering was done back in the mid-60's, our L6 heritage is a beneficiary of that mentality.

SHADY280

im using a p79 head decked .080" on my na application and i love it, ive done it to 2 cars now. i even had custom 80 thou cam tower spacers made.

bradyg

how am i supposed to check the rings

NismoPick

Compression test is the easiest way... but if you have the head off you can use a feeler gauge & look at the cylinder walls.

bradyg

ahh im just gonna rebuild it

bradyg

any one know where to get cheap rebuild kit for it

NismoPick

Any major machine shop... Nissan... MSA... BlackDragonAuto... Prolly even JCWhitney. BTW... remember the saying "you get what you pay for" ??? I would apply that here.

jfairladyz

Dont look for the cheapest rebuild kit. Thats asking for trouble. Look for the best rebuild kit and then try to find that kit at the lowest price. Gaskets, with the exception of the head gasket, aren't really that important. But things like rings and bearings you really don't want to go cheap (quality) on. If you can't find a good kit for the price you want then try piecing good parts together from low price retailers.

duowing

Now I'm still new to alot of this, but when you say about getting the head shaved down, you mean in a same way that you'd get them shaved/resurfaced when the head gets warped? I'm thinking about looking into some of these things so I can pull a bit more power out of my N/A.

SHADY280

yep thats right