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I have no idea about the Holley. What exactly is a spread-bore carb? Function? How can I tell? All I know is that when all barrels are open, it roars & runs . . . and sucks down gas quickly.

Bror -- I feel like I'm back in college studying pyhsics after reading your summary above. As for reporting back -- I'b be happy to . . . so long as someone clues me in on the "UOA" lingo !

TC -- awesome summary! Thanks for helping the oil ignoramus. As for the CT winters -- the vette never sees the light of day when the temp is below freezing. We tuck her under a soft blanket to hibernate from November to March. An occasional warm sunny January day MIGHT coax her out for a quick...

Ahhhhh -- my one "non-stock" component. My Rochester Quadra-jet was swapped out for a Holley 650 double-pumper at some point by a previous owner. Don't know if that carb has the same issue/reputation.

As far as I know -- yes -- I'm a totally stock LS-5 engine. The only time I have to watch my engine temp is extended idling. Had problems in a parade route out in Hershy, PA last summer. (3 hours to drive 5 miles!) As soon as I get air flowing through the radiator, I'm OK. The stock fan just...

Thank you all for your input!

I'm thinking not nearly enough to warrant putting the higher-cost synthetic in! Last year I put 3-4,000 miles on her total. She is a "weekend & sunny day driver."

I do not have a complete 33 year history of the engine as I'm the 4th or 5th owner of the car. It is all original based on casting numbers, but whether it was ever rebuilt say 15 years ago ... I have no idea. It does go through oil almost a quart every 1000 miles -- although it does not leak...

OK -- why might the move to a synthetic not be the best idea? and what exactly is the difference between a "40" and a "50" in the viscosity ratings? Remember -- I'm an oil ignoramus!

I've owned my '71 Corvette for 3 years. It has an original 454/365bhp engine. Since something generally goes wrong with her every 6 months or so, I usually have my mechanic "change the oil" while it's at his shop. I've never asked what he puts in it -- frankly just never gave it much thought...