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Also use old headers to break in your new motor.
O come on There is nothing like watching a brand new set of headers turn cherry red especialy when they are coated. 
Yup that happened to me with my new 6 pak motor running during break in.  Then I read TTI instructions to use old headers foor break in. Damn why didn't I read them first? 
broke my 440-6 in w/ my el-cheapo headers that I stripped and used VHT paint on and they still look great.
The cherry hot headers is a weird thing because i broke in my 493 with tti's and they did not get like that but i have a roller cam in that motor . and 850 deamon was running at about 11.5 a/f then HA HA.
On our 383 hydraulic cam motor it did turn cherry red i assume the timing was retarded and lean to cause that .
1969 Dodge Charger
1969 Dodge Superbee
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