Head identification

[scenic760]

Hey All,

I needed some parts to put my project back together and found a guy getting rid of all his SBC stuff. He had a pair of rebuilt heads which I was in need of.

The casting number points it to being a worst of the worst (by most estimations) smog head but the casting marks don't line up with that. Apparently there were two types of this heads that were available and one was production and one was over the counter.

Anyone have any idea what variety these might be? At the end of the day, they are fresh, clean and surfaced so way better than what I had regardless.

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[AKguy]

Any paperwork regarding inspection, magnaflux, etc.? For years I have read those heads are prone to cracking. I’d say if you are not looking for a performance engine use ‘em.

 

[scenic760]

Any paperwork regarding inspection, magnaflux, etc.? For years I have read those heads are prone to cracking. I’d say if you are not looking for a performance engine use ‘em.

Nah, no paperwork...and like you most of the stuff I read said they were prone to cracking however there were a couple of differing reads on them...

It also looks like at some point the junk version was made in Mexico...

 

[Dave M]

I would rather stick with head castings that are known and proven than take the risk, if these fail on you, your up for a bigger outlay.

 

[Ricko1966]

The 624s were good enough that they were the l82 corvette heads 73 thru 1980 so they are smog era decent heads. If they're already worked and ready to run run em , don't overheat them. Supposed to be crack prone I think it was number 3 and number 5 at the exhaust seat, read up a little bit, hit the prone areas with a propane torch if they're cracked the heat will make the cracks obvious. Depending on what forumn what website, etc.etc. everyhead you ask about unless it's a vortec or a double hump are the worst heads every. How can they all be the worst heads ever?

 

[ali_c20]

I had this heads on my original K5 engine. They work as expected, low end torque is ok, power is so so. If you're looking for higher compression and performance I would not use them. Check them for cracks.

 

[scenic760]

Apparently there were at least 3 different versions of heads with this casting number. The VAST majority of them were production cars, then as police cars and then as an over the counter "performance" (80's standards anyways). The production castings are prone to cracking however the other two were not.

I think these are the police car variety as it would line up with the guys story I got them from. He said he would buy stuff at government auctions and have his mechanic tear them down and rebuild the heads, etc to service his fleet vehicles.

Not looking for a dragster build but not wanting a future problem either!