Overheating Issues, Perplexed

[elmariachi]

Originally Posted by vettestr

Ron Davis is local for me and taught me a few tricks or system checks. All coolant systems works best under pressure and a magic number seems to be 12.5 PSI as the MIN. and that is easy to verify (a fuel pressure gauge works great).... I know you verified timing against the marks but go 1 step more. I would be tempted to roll in initial timing until it rattled or bumped against starter then check to see what timing marks are showing again as a sanity check. If you have 45* you know the marks are wrong somehow, you could do a piston TDC stop and check marks that way too????How about some new photos of rad inlet/outlet sides with shrouding?

We are testing the cooling system pressure this afternoon and checking for combustion gasses in the coolant. But talk to me more about the timing issue. When I left the dyno we had a timing mark on the balancer with 18 initial and 18 in the advance, total 36. I have since gone up to 20 initial based on changing to the 750 Mighty Demon with 18 additional advance, total 38 by 3k rpms. I am using the aftermarket timing pointer that came from Professional Products with the balancer. It mounts at the 11 o'clock position in the OEM holes and PP says its suitable. So there should be no issues there right? How could timing not be right in this scenario?

Originally Posted by DAVID GAGNARD

El;

I've had the best luck with the el-cheapo Auto

Was has me puzzled is the "boiling" back of the water in the expansion tank, that ain't good........

I would try the water restictor instead of a thermostat,

I'm like vettestr, I'd like to see some pics of the front of the car as well as from inside looking at the back of the radiator.....

I don't recall seeing it, but are you running a puller or pusher fan??both???? David

Originally Posted by Blas

Just a thought...
Assuming the fans are in the engine compartment, they should be "pulling" air into the engine area...

Ordered the restrictor package. I have reinstalled the NAPA t-stat that opened the widest and closest to 180*. Didn't drill more holes, trying to change only one or two things at a time. Refilled with distilled water, headed to the radiator shop for testing. Fan is a 3600 cfm Zirgo puller. Shroud is a JEGS aluminum trimmed to fit tightly and made for 16" puller fans. More pics later today but here's the shroud: