On my 1975 Ford 302, I blew a head gasket. So today I'm going to clean up the heads and replace the gaskets.
Step one is draining the radiator. There’s a lot of coolant running through the engine and draining the coolant will save you some of the cleanup.
Step two is removing the distributor, valve covers, and intake manifold. On my 302, I had to remove the valve covers on both sides of the block, then remove my intake manifold to get to the head. There are 12 bolts holding in the intake. You don’t have to remove the distributor, but it’s easier to get the intake out if you do.
After the intake is out of the way, you need to remove the exhaust manifold or headers. I just unbolted these from the head and pushed them out of the way.
At this point, I removed the rockers and push rods to get them out of the way.
Then, you can get to the head. There are four bolts on the top and four on the bottom. I also had a bolt running through from my alternator bracket at the front of the engine.
Since I’m replacing the gaskets, I’m going to go ahead and replace both sides and clean up the heads.
At this point, it would be silly not to clean these up. My plan is to take the heads a part, clean up the valves, send these off to a machine shop to make sure they are flat, then rebuild them. Im also going to clean the carbon from the piston heads and cylinders.
To remove the valves, you will need a valve spring compressor. I rented this one from Oriley’s and it did the job. With all the valve springs removed, I could pull the valves out to clean them up.
I made a mixture of acetone and transmission fluid on a scotch brite pad and a razor to clean most of the heads and valves up.
With everything cleaned up, the last step is valve lapping. I’m using this permatex valve lapping compound and this lapping tool, putting the compound on the edge of the valves and spinning until I hear is spin smooth.
Now that everything is clean, I’ll take my heads to a machine shop to make sure they aren’t warped and clean up my pistons and cylinders.
One thing to do after you clean your pistons and block is to make sure the threads in your head bolts are clean.
The open part of the head gaskets go to the rear of the block and the front is going to be blocked off. The reason is because the front is blocked, forcing the coolant to flow through the back. If you put the head gasket on backwards, the engine will severely over heat.
I’m using ARP fasteners on these heads. Head bolts are something you don’t want to go cheap on and ARP are the best.
ARP Bolts:
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Valve lapping tool:
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Valve lapping compound:
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Head Gaskets:
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00:00 - Intro
01:22 - How to remove heads on Ford 302
02:44 - How to remove valve springs on Ford 302
03:14 - How to clean up heads on Ford 302
03:43 - Lapping valves on Ford 302
04:09 - Cleaning Ford 302 block
04:28 - Reinstalling heads in Ford 302
04:46 - Ford 302 head torque sequence
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