i have 350's front and 250's rear. saab lump is roughly the same weight as the pinto lump. its never an issue of suspension travel and i have never hit a bump stop. the fact of the matter is that the car is 120mm off the ground and if it goes up a hill then down into a dip the suspension will load up. if its loaded up and something is high in the road it will touch down. making the springs harder would just make it horrible to drive over that rough kind of ground. at the end of the day i have driven loads of 7's and they all tend to do it unless the owner doesn't know what they are doing and has the thing up on stilts
the inevitable thing with all sevens even my mates r300 caterham is that at some point or other they will touch down. so its best to scrape a bit off the bell housing rather than the sump. btw there are 3 people in my club that need their sumps welding up for this exact reason.
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