![]() The first place we typically look is the casting number on the back of the block. These heads were used on performance engines (300 hp and up) and were used on iconic engines like the DZ302 and LT-1 from 1969 through the early ’70s, so that was an instant win. Upon arrival, we were pleased at first glance because the engine has a set of small Camel Hump heads (also called Double Hump) with accessory holes. No information was provided with the car or engine, so we took a chance because the price was right, and we needed to get the deal wrapped up quickly. In the case of our subject engine, we picked it up in a package deal with a ratty late-’70s Nova. Without even looking up the numbers, we know these heads are desirable based on the fact that they were used on 300hp and higher engines from 1969-72.Ĭheck it out: A Budget Small-Block 355 Hydraulic Roller Cam Conversion ![]() Another immediate clue to this engine’s identification are the later Camel Hump heads with accessory holes. Our intention with this article is to give you some clues for quick inspections when you’re under the gun, and some tips for further investigation when you have time to run the numbers. Also note that 400s had a specific counterbalanced design due to being externally balanced. There are a few exceptions to the balancer size, such as the large balancers used on the legendary Corvette 327s from the mid ’60s. Early small-blocks, like the 265, 283, and early 327, had a very small balancer, while the trusty 305 had a much larger balancer this one falls in the middle, which is a good sign. Upon first inspection, we spotted the medium-sized harmonic balancer.
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