EZ30 Swap Rear Spring Problem

[KCCAPN]

I just bought my first one, 1971 914 1.7. The car has been sitting for over 3 years. On one hand I'd like to keep the car original but I live in Texas and I do enjoy my air conditioning, so, after I get through all of the body work and rust repairs, I'll be doing an EZ30 and a Subaru 5 speed swap. What I can't seem to find any information on is what people do about rear springs when adding additional weight to the car. From what I've been able to find, doing this swap will add about 130-160 pounds of extra weight on the rear springs.
Do any of you all know what spring rate the original 4 cylinder springs are and what I should look for to support the heftier Subaru drivetrain? I know I can do coil overs to make it adjustable but I still need a good starting point.

Thank you

[petza914]

You've posted a Tech question in the parts for sale area so may not get a lot of input, but the chart below should give you information on stock spring rates. Those I'm sure have sagged a good bit from when they were new so probably aren't the same as what they were rated for. A set of 100 lb rear springs should tighten up the handling, handle the extra transaxle weight and still work well for a driver's car not a track car. If you'll be tracking the car, may want to move up to a 120 lb spring, but it will be quite a bit stiffer on the road.