Quote:
Originally Posted by twicks69
I was running a stock 1G head for the longest time (just swapped heads in May when I trashed my old one) with just Crower single springs and titanium retainers, HKS 272/272 cams and ARP head studs with a Mitsubishi MLS head gasket. The head was unported with stock sized stainless steel valves.
Now I am running ARP L19 Head studs, a Mitsu MLS head gasket, a new 1G head with 1mm oversize valves, Supertech dual valve springs and titanium retainers, no porting, and HKS 288/288 cams.
Both heads had no problems with holding 49psi; my first head just got so worn out; the springs were less than 40 for spring pressure, causing them to valve float due to boost and trashed the head. The head studs were also 4 years old, and the cylinder head was 5-years old (valves, springs, retainers, guides, lifters, etc.)
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Twicks, I really appreciate your willingness to answer my questions. You rock.
Thanks to the rest of you for giving your answers and opinions as well. Twicks, were those numbers you posted made with the newer head with 288s or the old head w 272s? My 2g head is unported and has not had a valve job, however, it has been hot tanked and has all new factory size valves and fp3 cams as well as a new set of fp dual valve springs and retainers. I had originally planned to buy a new cylinder head or have a valve job and port work done to my current head as one of my last mods, but the shop that is tuning my car right now is telling me I should have a valve job and port work done before I bother with any other upgrades (turbo, manifold etc..) because they say "the upgraded head is where you will make all your power". Do you guys think I should stick with the head I have or upgrade? Also, my engine is not o-ringed, but it does have arp head studs and a cometic HG. Is o-ringing and using an MLS HG necessary to push 40+psi, and if so can it be done without me having to pull the engine again? I have about 9k that I can spend on the car right now, and by the time I upgrade the turbo, maft, axles, injectors, a bigger intercooler, transmission, differential, misc drivetrain parts, a little bit of labor, and a clutch, I don't know If I'll have enough money left for a head upgrade. What should I spend my money on with my limited budget?