thank you for clarifying

 

My friend has a P90A, and his isn't stamped "P90A" it's only stamped "P90"...........

 

its stamped "P90" and has the hydraulic lifters?

what year car did it come out of? pics?

 

it's out of an '83 we believe, he bought it off of Ebay and it was converted to solid lifters, so yea...

 

an 83 will deff have a P90A stamp and hydraulic lifters

did he get it off ebay already "converted"

 

yea, and it's a POS "rebuilt" head lol

and AFAIK, all P90 heads were stamped P90, regardless of it being solid or hydraulic (talking the same place where the "N42" "N47" markings are at on the right side of the head).

 

All the heads stamped "P90" are solid lifter heads (81), some of the early 82's are stamped "P90A" but still have solid lifters and later 82 and 83 are all stamped "P90A" and have hydraulic lifters

 

show a pic and I'll believe you, but I know for a FACT that my friend's head was originally hydraulic, and is stamped "P90"

 

See? I TOLD you that they were stamped P90A! lmfao

 

im so confused now ^^^^^


so what have we agreed on, its stamped P90A for hydro head and P90 for solid or is there still a dispute going, cause i have a motor from i believe an 82 with a head stamped P90 and was excited to not have the POS hydraulic lifters (which is weird since hydraulic lifters are a god send on every other car in the world haha)

 

No, solid lifters are alyways a step up from hydraulic, the only upside is that you don't have to adjust the valves with hydraulic lifters as often (speaking for V8's and stuff).

 

ok yeah im really confused now, i'm looking to be around 3 - 400rwhp eventually, should i get a head with solid lifters?

 

^^^ for a Z car with an L motor yes. and apparently for V8's, but hydraulic lifters in more modern cars a both pretty standard and awesome, work how they should

 

yes. A P90A hydro is good for about 3-400Hp if you don't plan on going above 6500rpm or so. Which isnt bad, but the problem is there are no replacement lifters, period. The one and only place you can get them is from another used P90A head. Nissan's long been out and theres no after market support.

 

smooth

 

if you running stock systems. go with a stage 1 cam. it will give you a lil more, will run better since it's a lil less demanding. and of course, you can learn how to adjust to that easier then fckin up a good motor running to lean. just my cents