the BS on this is that runs up to $250+ my buddy bought a set for his sr20 s13. 160 i think..Ok I called ARP and gave them the messurements for the head bolts holes. Head thinkness 76mm, block bolts depth 29mm and the tread Pitch 12 by 1.50
Part number# AU4.950-2B $20.22 US per stud
Washer part# 200-8516 (per washer) $.94
Nuts part# 300-8307 (per nut) $4.33
If anybody looking for ARP head bolts.
-Does anybody know for a fact that these are the right sizes. I'd hate to buy them and have them not work
[cough]my mix up actually it would be 85-89 4th gen celica alltracs:angel:
hush your mouth...I'm working on getting a bracket made for FC monoblock 4pot calipers to work[cough]
Some of the early JDM 90-91 Celica GT4s also had twin pots.
What's interesting in all this is that if the dual piston calipers, it should be just as hard/simple to fit the gigantic ST205 Celica GT4 brakes onto a 1G as it is on an ST165/ST185. They're heavy, but they're also gigantic.
So where are the actual stats that say what spring pressure the B2000 springs are vs the F2?mx_masta said:I can't believe nobody beat me to this:
What: Dual valve springs!
Donor car: GC 626 & B2000.
The OEM dual valve springs from a 2 litre SOHC Mazda FE as found in GC 626's and B2000 trucks.
Also aftermarket spring for the FE or nissan L series engines for even higher seat pressure.
Mods required: none these are a direct fit on an F2.
Well almost... You can fit them as is but it is better to also fit the FE spring seat (sits between the head and the spring) to protect the soft alloy of the head.
Why: The OEM F2 springs have much too low a seat pressure for a highly boosted small-medium size turbo engine.
This leads to valve bounce (the exhaust valve lifting off it's seat due to high exhaust manifold pressure) during the induction stoke when it's meant to be closed.
This kill torque production over around 4000 rpm with a small frame turbo once you are running over 20psi or so.
Note:- With a large frame turbo running the same 20psi exhaust manifold pressure is much less and valve bounce is greatly reduced, therefore dual valve springs are of less benefit in this case.
My estimate for seat pressure for FE-8V spring in a F2 can be found at post #38 in my valve springs thread.So where are the actual stats that say what spring pressure the B2000 springs are vs the F2?