Ya I herd someone used that plug in a sbc under the head. LOL That's a *****. Give you credit for owning up to it. I don't know what this guy did but he fd upd. All good he learned the hard way I have too.

I kind of figured as much that's why I made note to not get down on yourself. Might be a little costly but I've seen much worse happen with newbies. We've all made mistakes at one point or another building engines. I think most would agree with that at some point in their life or perhaps their not being honest or they simply haven't even built an engine. I was taught at very young age from one of the most meticulous engine builders I've met even to this day. When I mentioned clean, clean, clean in earlier post that of course is extremely important however actually got me in trouble many years ago on a build.

After I got my rotating assembly back from machine shop having balanced I was adiment about recleaning everything before assemble so I soaked my Pistons, rods, crank, rings etc. So to make a long story short I ran the engine for about 3 minutes during cam brake before it locked up. Would not even roll over. I was dumb founded as to what I could have possibly done wrong or what broke etc as I had built several engines without failure. Needless to say what I had completely forgotten prior to assemble was to relubricate piston pins. When I soaked/recleaned Pistons and rods it had desolved the assembly lube. It finally dawned on me what I had failed to do once I got over the initial shock of having to pull the engine and do a complete tear down.

I was able to save the pistons with honing slightly over acceptable clearance but did have to replace the pins. Needless to say this hurt my pride more so than my wallet however it was a learning lesson. You can never be overly conscientious when it comes to building engines and don't get distracted. Sometime with our busy lives we get involved with many things going on at once. It happens. I am still overly cautious with not only over cleaning parts but also assembling in an exceptionally clean shop. Back to the Pistons and rods if you ever run into such a thing just put your assembled Pistons and rods in the oven at 200 degrees and oil your pins while moving rod side to side and rotating until they are lubed well. I use assembly lube.

Most often I don't assemble them until ready for install however things don't always work out the way you'd like so sometimes they may sit on the shelf before install potentially collecting who knows what. In which case have plenty of siran wrap and clean boxes on hand.

Just thought I'd share this as it may help you or others from making the same mistake as I.

Something I always do when installing new hydraulic lifters which I haven't heard talked about much on here is I will take a container of the oil type I plan on running in the engine. Then holding a lifter submerged in the oil I will pump it slowly with a pushrod until bubbles stop coming out of it and it is pumped up solid. Then I install it in the engine. It now will not collapse on you so easily when your adjusting the valve. I also adjust both valves on each cylinder with the piston in firing position at TDC. Start with #1 cylinder in firing position, timing mark on "0". Adjust both valves. Then turn the crank 90 degrees and adjust both valves on the next cylinder in the firing order. Continue till all have been adjusted. This method is very accurate and you only turn the engine over 2 revolutions. Another thing is to always install your valve train before putting on your intake manifold so you can clearly see when the pushrod has zero end play to the lifter.

Same applies for a Chevrolet.

That cam didn't have the 4/7 swap did it???

I never really saw the advantage of using the roller tip rocker arms over a good set of the stamped steel units (long slot) for moderate and low lift cams. GM was running these rockers for decades with cams up to around .550 lift with few failures. If you are going to upgrade, spend the extra coin for full roller rockers - good ones, not the cheap Chinese knockoffs.