Thanks everyone, good input for sure! I think I'll go ahead and pop for the new 18" 7-blade clutch fan, mainly for any additional cooling.
I'm probably done racing for the season, but can follow up with some empirical road testing once I get the new fan installed.
Thanks 68 Firebird, I'll investigate the different sized pulleys next if needed...
Any further input is welcomed!
Jim.
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* '69 Custom S - 2dr Hardtop Coupe - Rust-free Oregon survivor with all original panels and original trunk floor
* Engine alive and kickin' March 2nd, '06 
* RA-IV 'spec' 400 (.060-over = 410ci), balanced, Comp Cams #9794041, #16 heads (72cc converted to large valve) with 1.65 Harland Sharp Rollers
* QuadraJet #7042210, HEI, Hurst V-Gate, FlowTech Headers, X-Pipe with dumps, Flowmasters, TH-350, 3.90 Posi
* Best ET: 14.06 - Bandimere Speedway, CO. @ 5,800+'
Last edited by tremo; 09-16-2021 at 11:09 PM.
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