See I'm having to make a decision on this pump also. But I'm only running 3/8 lines. Under hard acceleration it drops to 3.5 lbs. I'm still not convinced that going to 1/2 lines is going to help this. I'm running new hard line and rubber
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1969 Firebird "400". 408 Pontiac, #62 heads, 274 XE cam, Eddy RPM intake, Quick Fuel Slayer 750, Carter Super Street fuel pump, Mallory Unilite, Turbo 400 with shift kit, Continental "Jim Hand Special" 3200 stall, 12 bolt 4.10 posi. 1 5/8 inch headers, 2.5 exhaust with Dynomax Ultraflos.
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