Adjusted timing bck towards advance, ran much smoother.  Only a couple initial pops out of carb.  Replaced carb gasket w felpros, no sign of leak there.

Got about 30 min of runing at 1250 to 1500 rpm.  Oil pressure was good,  32 to 34 initially. Down to bout 28 at shut off.  Engine a little hot at end almost half way.

Some popping noises inside.  Like internal backfires.  Not metal, but there all the same.  And frequency increased as i approached 1500 tp 1600 rpm.

One thing at back of valley pan that worries me,   note color of fluid.  Id that oil n antifreeze?   Normal during breakin, or are my head gaskets not holding?

I will ck a couple videos to utube, see if that thumping is visible and any other things anyone may see or hear.

Timing at 1500 was about 5 to 7.  Seemed smoother there

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63 cadillac rebuild start number 2

Video of second day   at .13 and .17 i think there is that sort of clank or pop i hear sort of insidr the engine

Time to torque  all you can back down and that could  possibly solve the fluid problem at the rear of the engine if a head leaking a bit now and causing a plug misfire if that is  possibly the sound we are hearing 

Hard to tell from here 

Do you have new spark plugs in the engine this time ?


Yep.   New plugs at 35 gap

The timing SB set at 480 RPMs when you can do that - - which SB a different timing setting than at 1500

The timing may be causing the noise you are hearing as it may be advanced to much causing detonation in the cylinders at times 


Clean up the liquid at the back of the manifold so you can see if  a leak repeats itself or not 


Probly chg oil tomoro,  its milky.  B4 running again

Kim, congrats on the start up. The engine seems to be running smoothly. Normally you woudl change oil at 500 miles (or at least by 1000 miles) but since oil is milky you would want to change and monitor closely. This may be due to various leaks, but otherwise the oil should remain quite clean until you do that 1st oil change. Let us know if oil stays clear after change.  If it is getting milky again it cut point to leaking or bad head gasket seal, etc. Hopefully, it is just one of the prior leaks you have addressed. Good luck.

Thanks Jason.

I reran it again, chged oil, filter, etc.  Pulled valve covers gave everythingva retighten,  i may hv actually missed one or two that i had tightened down to abput 50 in my sequencing tightening and missed on the final pull, but evertything is tight now to 75.

Ran about 20 min at 1500 rpm.  Was cking for that murkey leaky and itnever materialized,  oil was clear as bell after run on stick, were it it had been murkey before the oil chg.  So maybe that tightening up did it.  Hope so.

Engine runninf a little hot, like a tiny bit before midway, about the gauge needle.   When it shut off whem i tried to decelerate to set timing  when i started it back up, it was way over the middle. Almost 75%, so. Not sure what that could be, but it backed up some once i got it running

I kind of dnt think mt distributor is in right.  Car idles at 900.  If i try to push off the acceleratorvat the carb,  car wants to die.  So i cnt get it to 450, 80 to set timing at idle.

Anyway,  attaching a last video, still getting some backfires. One every other minute or so, and that sort of deep engine kind of backfire,  videp isnt picking that up.

3rd day, st

Picture is from oil chg

Glad you resolved the oil -coolant issue very easily - a blessing for sure 

Your idle not coming down below 900 RPMs   unless it stalls —your back fire issue and your higher engine heat could all be an incorrect ——Timing issues 

I think your timing is too advanced if you cannot get the idle lower 

Are you seeing your timing mark clearly  on the timing plate ?


Nvr got reslly low enough to test at 480.  Tried to keepit upfor breakin


When you torque the heads down again — now after the break in  run was done — if you feel they get a bit tighter than they were before hopefully that may seal them up better to the block ( a quarter turn or more ) 

Otherwise —you may have to pull the heads and reinstall them with new  head gaskets to prevent the coolant from mixing with the oil 

Watch your —new  oil carefully at this point 

Watch your ——coolant level as well so as to not overheat the engine - may need some added 


Read my reply tp Jason above,  spells out todays running



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