Thread: How high compression for blower

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My buddy has a 37 ford slant back with a 454 built engine. He's running 9.5:1 compression and wants to add a Weiand 6-71 blower. I told him he's running to much compression. I think the highest he could go is around 8.75:1. Maybe thats even too much. Since I've never had a blower on any of my engines, I just wanted to find out if 9.5:1 will scatter everything if it hickups.

I belive 9:1 is the limit for charging, could be wrong though. tell him to shave the heads a little.