Marcus, you need to figure out which reading is right. The temp gun numbers are great. 210 at idle sounds high to me and I thought halfway on a Rally Guage was 175. When my RG worked my cars usually ran halfway with multiple different engines. I thought on a hot engine you pull the cap while it's running not off.
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Chris D
69 GTO Liberty Blue/dark blue
T400, 9" w 3.50s, 3905lbs
461, 850 Holley, T2, KRE 310s, Comp HR 236/242D .572/.594L, RA manifolds, 11.53@114, 1.55/60
The spare: 467, 850 Holley, T2, Edelbrock Dport 310cfm w RA manifolds, Howard HFT 245/251D .561/.594L, 11.59@ 114, 1.57/ 60'
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