86 newbie

Hey guys so i just put my 86 5.0L engine back together after doing an x-303 cam, 93 cobra heads, and a cobra upper and lower intake swap. Ok so when i started it up today it was missing like a bitch. When i advanced it helped a little but it still missed bad. There is also water in the oil but i think that is because i missed some head bolts with sealant and there is also water in the upper intake but i read that it is caused by the egr and throttle body spacer gasket. So the main problem i have is the missing. Any ideas? Thanks

mjr46

is this a true 86 bottom end with the no valve reliefs in the pistons??? or have the pistons been changed??

mjr46

when using a 93 style cobra intake, they don't use the spacer....if you did, you have a cluster phak

86 newbie

It is a true 86 bottom end but i checked the piston to valve clearance and it was ok. The intake doesnt have the spacer and i hooked up the coolant line from the heater hose to the nipple on the throttle body plate which is where i think i got the water from. Would that cause the bad missfire too?

dawson1112

Sounds like you fed your vacuum strait coolant.

86 newbie

Yea thats what im thinking too. For the head bolts do i need thread sealant on all the bolts? I know some chevys you dont but what about the 302?

86 newbie

Update. I pit thread sealant on the head bolts and i took off the coolant line to the intake and fired her up. Now its blowing white smoke and the exhaust is extremly hot real quick. My chrome headers turned blue and even my tail pipes are hot to the touch. There is a miss now when u rev it but once it revs it seems to go away. Any ideas?

mjr46

only the short lowers get sealant

mjr46

time to do a compression test and make sure something internal didn't get fubar

86 newbie

Well i timed it and holy crap it was way off. I have it timed at 12° now but there is still the miss. I think its because there is too much fuel pressure. Its at 42-45 on idle. I got that bbk regulator before realizing they are junk.