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11 Posts
It's been a while since I've posted. Nice to be back. A while ago I swapped a doner 3.4L of unknown milage and it's been great so far but the motor is getting tired. The compression is about 150 in 4 cylinders and about 114 in 2. So, it's about time to do something with it. The tranny etc. seem fine.
I have 3 options:
1. Buy a crate with a tow package for about $1500. Since I've already done all the swap stuff I'd only have to drill the starter mount.
2. Replace the heads (leaky intake valves seem to be causing the low compression), cam and lifters for about $700
3. Get rid of the Trooper . . . it has about 400,000 miles on it.
I'd like to save as much $ as possible, but I'm worried that if I just replace the heads and cam without rebuilding the lower end I may be just buying myself a little bit of time before the rod and crank bearings go out. Right now the lower end seems fine - there's no noise and the oil pressure is about 27psi at warm idle and 65psi at warm 3500rpm, but I'm worried that the increased pressure from the new heads and cam could put too much stress on the old parts.
So, what kind of luck have you had putting new heads on an older block? Should I just bite the bullet and buy the crate engine?
Any sage advise is greatly appreciated. Jim
I have 3 options:
1. Buy a crate with a tow package for about $1500. Since I've already done all the swap stuff I'd only have to drill the starter mount.
2. Replace the heads (leaky intake valves seem to be causing the low compression), cam and lifters for about $700
3. Get rid of the Trooper . . . it has about 400,000 miles on it.
I'd like to save as much $ as possible, but I'm worried that if I just replace the heads and cam without rebuilding the lower end I may be just buying myself a little bit of time before the rod and crank bearings go out. Right now the lower end seems fine - there's no noise and the oil pressure is about 27psi at warm idle and 65psi at warm 3500rpm, but I'm worried that the increased pressure from the new heads and cam could put too much stress on the old parts.
So, what kind of luck have you had putting new heads on an older block? Should I just bite the bullet and buy the crate engine?
Any sage advise is greatly appreciated. Jim