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Old 06-08-2021, 02:20 PM
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leeklm leeklm is offline
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Join Date: Mar 2013
Location: Mpls, MN
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Correct, car is about 3,100 rpm at 70 mph. I will get the advance coming in earlier to see how it acts. Temps in the 90s here in the upper Midwest so we have great conditions for testing the cooling system!

Car stays around 190 (180 deg stat) if keeping speeds at 60 mph, and closer to 185 if easy going around 45mph or so. Based on that, I am also thinking the water pump plate clearance should be fine- unless the pump is cavitating at higher rpm??

One more quick note... the previous engine build was cooling fine with the same components, but that motor was very tired, 2 cylinders way down on compression.

Curious how free flowing exhaust might impact cooling at 3k rpm? Car currently has standard iron manifolds with "crinkled" 2" pipes and tiny mufflers. I am sure a decent exhaust system would not hurt. Uears ago I had a 67 Lemans with a stockish 455, which was running warm when I bought it. One of the down pipes was crushed and definitely not flowing like it should. I installed headers and a couple mufflers bolted to the collectors ( as any good 19 year old would do) and no more cooling issues- but again that was a little extreme with the crushed pipe, probably equivalent of a 1" pipe on that side.

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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight