Halfway through my second build (S5 T2) and I noticed some scratches I wasn't thrilled about on the rear housing. The rest of the rear housing, and all of the front housing, looked really good, except for these two scratches. They are lined up with the top plug hole and are each deep enough to catch a nail on, but not too bad. This is also right in the area where they will affect compression the most. Here's a picture:




and another through a 10x loupe:





The engine is being assembled mostly with used seals, trying to get it running economically at a lesser power level than before. (400whp before, maybe 250-300whp now.) The used seals have about 2500 miles on them, first engine broke a side seal because I clearanced them wrong. I'm wondering if anyone can give me an idea of what the specific effects of using this housing would be, or if it's worth the $330 to have it resurfaced. ($150 per housing, it would probably be a good idea to have the other one done too, plus shipping)


Also, bonus round!

The first engine was assembled with housings of unknown vintage...I thought they might have been S5 T2 housings, but the rest of the engine was S4 T2. The new housings came off a series 5 T2 engine (with a series 3 front cover and oil pan!?)

The housings from the first engine are stamped "4" near the bottom, in between the two circles. The housings from the second engine are stamped "5" in the same spot. Coincidence? What do these numbers mean? Housings appear to have the same plug spacing.

 

i would use those housings

 

Thanks, I'm going to give it a shot