1965 Chev. 427, in boat @500hp. throws oil at @3500 rpm why??

Question

Eng rebuilt, 10.5:1 comp. Friend had same problem. Tried vent cover filters both sides, hooked pvc valve to primary rear carb. Eng produces internal pressuer not able to get it down. If use sealed covers it blows out gaskets. Oil messy

Answer 1

i own a repair shop and these engines do produce a lot of internal pressure in them you have to run a stack vent on them to get them to stop doing that it don't look good but it will work ,or try venting it off the top of the oil pan,you have to remove the pan and make a vent that comes up the side of the engine,this will release the pressure off it it , i had one that did this,it made a mess every time i ran it,finally after many attempts to stop this ,i figured out that a big ugly vent would work,you can have this thing chromed and it looks good though,but it will work,but still leave the pcv valves on it they help with the smoke from the crank case,good luck with it,hope this helps.

Answer 2

What jwl curiously would not be attentive to that one and all of those automobiles, even although they share the comparable block shape, are no longer the comparable block. The cylinder partitions are no longer the comparable thickness, between different transformations. The mas maximum could have the skill to bore a 305 (without punching into the water jackets) is approximately .060 over, which, with the comparable stroke, might get you around 313 cubes. there are distinctive motives for the block transformations, the biggest being weight low fee expenses and cooling performance. A 305 block is like has already been suggested, a ship anchor. they have not got the bore ability for huge valves, which reduces their skill to breath nicely adequate to might sturdy ability. yet another factor is that traditionally the 396 and 427 are the two huge blocks. it rather is a possibility to take a 350 or 4 hundred block to those dimensions, yet no longer basic, or much less costly. without watching the video i might project to wager that that youngster is talkin out of yet another orifice.

Answer 3

If your engine blows oil at only 35 hundred rpm you have a
blowby problem... blowby is when the rings fail to seal against
the cylinder walls.... or the rings were not installed properly or the end gap is too great ( no more than .003 thou per inch of
cylinder bore) You have a compression ring, Top, and a Scraper Ring, MIddle, and a Oil Control ring, Bottom, if these
are not doing their job you will have a blowby/engine block
pressure problem... anything from a bad cyl. bore to bad pistons to improperly assembled components etc....

Answer 4

A set of rings haven't seated. The combustion pressure is entering the crankcase. Remove the oil filler cap if it's all milky, then Huston you have a problem.

Answer 5

often when people soup up their motors and installing high velocity and high volume oil pumps they forget to drill the drain holes larger in the head to the valley of the block. Other problem would be engine blow-by.