Blown EGT TEMP HELP
I have a blown 8_71 SBC it has :
Callies crank
oliver rods
venolia blower 7.5-1 pistons
comp solid roller .575 roller cam
gm alum bowtie heads fully ported
weiand 8-71 blower with factory pulley set up
twin holley 750 carbs jetted 73 front and 80 rear
msd dig 6 full msd everything else
My question is while street driving the car the EGT temps rise to over 1200 almost hit 1300 . the probe is in the # 2 exhaust in the center of the header about 3" from exhaust flange. if i let off the gas the egt goes down. to about 1000 and car runs good. while cruising about 2300-2600 the egt climbs up rapidly and car pops thru exhaust . only while egt is high timing is set at a locked out 30* i have tried 28* and still the same. plugs look like right mixture.
any help is much appreciated and i thank you in advance