Join Date: May 2009
Location: Texas Hill Country
I'm half hesitant to throw this out because of the likely pot-stirring that will occur but retarded timing will increase temps. Higher temp thermos, retarted/ported advance etc. was all part of meeting emissions requirements. I'm not saying that that's the entire problem as I don't believe it is but if your cooling system is maxed out, it sure might be the straw that broke the camels back.
I re-curved my dizzy to what the engine needed to run well, not what the engineers needed to pass emissions, went to properly set up manifold vacuum, base timed it at 8* and lower water temps were a nice little bonus to the added performance.
Are you dead-positive that your fuel and ignition curves are correct? Lean and retarded can really build up the heat. Also, I don't recall if it's been covered here but how is your exhaust? If you're running a fairly-plugged cat or restriction elsewhere, you'll likely have a lot of backpressure under a good load, like on the highway, and that won't let the cylinder clear out very well leaving nice hot exhaust in there. That can certainly escalate your issue as well.
This little heat issue has given you fits and I hope it all turns out well.
Last edited by swatson454; 08-18-2009 at 10:48 PM.