So my question is I have a 65 buick 300 with a cast 4bbl intake. I ordered a thermostat and it was the wrong one.(assuming it's for the 2bbl intake) I'm looking for some guidance on the proper thermostat for this intake. Thanks everyone.
Is the one you have that is incorrect, much bigger diameter? If so, you may have ordered/received a nailhead thermostat (2-9/16"), instead of a 300 small block thermostat(2-1/8").
https://www.rockauto.com/en/catalog...cid+v8,1319352,cooling+system,thermostat,2200 https://www.rockauto.com/en/moreinf...MaTh58Tct5QYRFuownlDcJGSNSsLpjLrjCEFU1p0TF8qT