402 stocker engine
 

I have 402 stocker engine that seems to have a lot of blow by. Having build this engine several years ago . it is a 454 block sleeved back to a 4.185 bore. Cp piston race rings honed the first time sv 10 diamond stone sealed up made reasonable power. Hauled it back to sd where it sat for 3years in the shop. Was going to sell it so put it on engine stand and ran it smoked out of the valve covers a bunch. So I took it apart had it honed. Reassembled it new with race rings ,put it on the engine run stand same thing. Took apart once agin. Took it to victory engine had it honed once more . New pistons and rings etc. I look the engine over upped the oil the ring thing still smokes out the valve covers. Not a little a lot. Any ideas?

Re: 402 stocker engine
 

Check it with a good Blowby meter! Then you will know!

Re: 402 stocker engine
 

Odd thing after you run the engine for 5-10 minutes you take the valve cover off and the smoke comes up from the engine for what like 3-5 minutes.

Re: 402 stocker engine
 

Take the engine back to Matt's shop and put it on the Dyno, he'll figure
it out quickly.

J.R.

Re: 402 stocker engine
 

Good morning to all,
Since you recently had this engine honed and re- ringed it, have you made any full power pulls on a dyno ?
It'll take a couple of pulls to get the rings to seat. Running at Idle or above Idle won't seat the rings.
Also what shape were the ring lands in ? If they have a excessive amount of play ( up & down) they won't seal either.
If you haven't run this engine on the dyno, I would, then make at least 4 or 5 full power pulls and that should get things in order.
Good luck with your adventure and keep us posted with your results.

Respectfully,
Henry Kunz 1534 H/SA

Re: 402 stocker engine
 

I have not had it on a dyno, the last time I put it in the car and ran it . Same result smoke out the valve covers. This is the4th time it’s been a part.

Re: 402 stocker engine
 

Ive seen small casting flaw holes in cylinder heads or intakes suck in oil when I was a dealership mechanic. Its rare but it happens

Re: 402 stocker engine
 

Check at the base of your spring pockets.

Re: 402 stocker engine
 

Yup, pull the intake if needed and look at the backside of the intake valves for any "puddled up" oil, or oil tracking in the runner. Then check the angles to ensure they match.

Re: 402 stocker engine
 

It has not smoked out of the exhaust, it actually leaks fairly well,