Alright my motor is fully built and only has about 1400 miles. Car just started pushing coolant ony in boost or high rev. No white smoke oil is good no bubbles coming up out of the radiator. Bin searching find people with similiar problems but its got coolant in oil or bubbles under the cap. I ran the oem head gasket with arp studs. I can drive the car all over and it will be fine ,but if I'm out on it hard somtimes will push coolant got brand new mishimoto hoeses and fairly new mishimoto radiator. Could it be my cap ,hg,or , any advise will be greatly appreciated. Thanks

 

sounds like a hg. make sure your IM gasket is not leaking on cly. 4.

 

Ok I looked on here earlier there wasn't anything I could find exacly like mine. so I just posted this up and saw almost the same thing below so sorry but please shoot me some advise if u can got 9:1 pistons darton sleeves built head on 10 pounds on break in tune its running super phat to. Just a lil info

 

Its good had a prob with that before so I put a super thick plastic one on

 

sleeves sunk?

 

Could be cracked sleeve
Could be sleeve sunk
Could be cooling system not bled correctly
Could be headgasket
Could be headlift

What engine? You left out the crucial details.

 

D16z6