August 9th update -
overheating...... I have tried several things....no real difference ....Motor runs great!
So I’ve tried several combinations and the engine seems to want to run hot....actually ..
Overview; ‘69 429 stroked to 460, 9k on block – bought in ‘71 – now sitting in Cobra rpl frame.
Fresh build – everything changed out (crank/rods/pistons/cam/springs/all bearings/rockers/Hi flow
oil pump/ hi flow water pump – (with new backing plate)/Dissy/Holley 750/intake/starter – all except heads n valves.
I’ve run this motor for about 15 hrs over several months;
I’ve replaced the left bank head gasket because it was incorrect. Gasket and block and head looked great.
Running 6-blade Flex-Fan with shroud.
Radiator – New Hi per aluminum ($500) – took off and flushed – its clear
Initial timing @ 16 (tried 6, 8, 12, 18)
Issue – pushes qt of
antifreeze out before it even gets hot – tends to run Hot.
Put 21# radiator cap on and it didn’t push any water out, but wanted to get up in temp (220 – 235)
It acts as though there is an air pocket. I bought a non-spill funnel to get air bubbles out....ran it for about 45 minutes on a steep incline, a few bubbles, but then it just overheated and blasted
antifreeze all over...(235 F).
Tried funnel a second time...same – pushed out 1 – 1/2 qt
antifreeze.
Ran compression test – 175; 170; 165; 170; 165; 170; 174; 175 – with closed throttle (couldn’t do WOT and crank).
(9K miles on cylinders; New pistons; honed cyl only)
I need to turn on aux garage fan to keep it down to 210 after 1/2 hr.
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Seems like large air pocket......I can’t get air out.....
1. so I ordered a -
Automotive Radiator Cooling System Vacuum Purge and Refill Radiator Kit CarTruck
Automotive Radiator Cooling System Vacuum Purge and Refill Radiator Kit CarTruck | eBay
2. Someone mentioned running bleed lines from the back of the engine to the water outlet. So I plan to drill/tap the back end of the Edelbrock manifold where the rear head water ports hit the manifold. (The stock manifold has a water passage across the back). Then tie the hoses together and run it to the top of the goose neck...and maybe put a bleeder valve on top of that.
If anyone has done this please chime in as I’ll take any information available.
There’s a zillion BBFs out there, Help......