splash21

still could be the head gasket if it is blow into a water jacket. to do a full proper test, uncap the radiator, uncap the oil, make sure said piston is on compression stroke and then pressurize through the spark plug hole. if the coolant boubles its the head gasket usually, is usually burnt rings, air through the carb would be the intake valve and air in the exhaust would be exhaust valve. its pretty simple. you could try a wet compression test and squirt some oil in that cylinder and then do a compression test. if it fixes it you have bad comp rings.


and there is lesson 1 in engine diagnosis lol

84conversion50

yup done all that just 1 burnt exhaust valve :P pulling the heads tomorrow

splash21

good luck man. and dont forget to do it right and change all you can while you have it apart.. see too many people half assin it

84conversion50

ill do all i can afford and save up as long as i can before actually getting them done.

splash21

well tax returns are just around the corner lol

84conversion50

i probably wont get anything. as for the accelerator pump can it go bad? i know you can blow a power valve by it backfiring through the carb when its cold but i dont think it has a power valve? the accelerator pump doesnt seem to be constant to what it pumps out.

84conversion50

new heads same backfire. my bottom looked fine after putting the new heads on did a compression test and was 130 across the board. whats the dealio? timing seems good and is right with a timing light. checked sparkplug gap. checked firing order. looked for vacuum leaks and shorts. noNE!

Gary H

If you changed the cam, it probably doesnt use the HO firing order. Wires to the right cylinders?

4 8
3 7
2 6
1 5
front

How are you adjusting the rockers? Shims?

BlackLX_92

use the ho fireing order i had the same problem all i did to fix it is brought the #1 to tdc and pointed the distributor rotor at the #1 cylinder and it cranked right up make sure you do it counter clockwise on the distributor :P but if you did change cam its prob a ho fireing order

Gary H

You're thinking of a hyd roller cam, his car comes with a flat tappet cam. Most of those come with the old 1-5-4-2-6-3-7-8 order