Hi to all , I am a new member. I have a 1967 Chevelle SS. I am on year 5 on a full frame off restoration and almost finished.
Engine is a .030 over 454 , with a Comp Thumper , roller cam and roller rockers too , with a 510/510 lift . Using large oval port heads , Edelbrock Performer intake with a 750 Quick Fuel Carb and a Quick Fuel manual fuel pump. Headman Headers , a 700R4 Transmission and the stock 12 bolt rear ( 3:73 ) posi. Also have a Eddie Motorsports Serpentine Belt System that came with the Alt , Water Pump , A/C Compressor and Power Steering Pump. For cooling I have a new Aluminum , Dual Flow Radiator with 2 - 15" Spal Electric Fans.
And yes my problem is , it is overheating ! Only have about 3 hours running time on the engine and about 25 miles on the odometer. I have been working on this overheating problem for about 4 months ! I have tried everything. I trust the engine builder. He has been build performance engines for over 40 years. In fact his father used to build engines for NASCAR !!
Per the engine builder my base timing is set at 15 before TDC. I have been told I can go even higher , as much as 25 but I have not tried that.
I am wondering if it could be running very lean and causing it to overheat. Since the first time I ran it it's been doing the same , no matter what I try. After it starts to warm up the thermostat opens and the temp continues to climb. I have ran it at highway speed for a brief time. And managed to stay around 220 but as soon as I slowed foe a traffic light it starts to climb until it gets to around 230 and I shit it down. I am on the 2rd radiator , the first was a exact replacement , a 2 core with 1 1/4" tubes wit 2 fans pulling 2600 CFM's. Also tried with and without a thermostat , tried a different water pump , I even tried a Steward Electric Water Pump in the lower radiator hose to increase water flow , NOTHING SEAMS TO HELP.
Anyone have an idea ??? IMG_0097.jpg