1st I'd try some higher octane gas.
Try taking it up to around 2500 RPM or so on a road, then give it the gas.
See if it makes that noise under load at a higher RPM.
Check to see if the fan is hitting the shroud?
__________________
John Wallace - johnta1
Pontiac Power RULES !!!
www.wallaceracing.com
Winner of Top Class at Pontiac Nationals, 2004 Cordova
Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats
KRE's MR-1 - 1st 5 second Pontiac block ever!
W.E.C moment
"Every man has a right to his own opinion, but no man has a right to be wrong in his facts."
"People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates