SEMA 2016: Edelbrock Debuts New LT1/4 Heads And Cross Ram Intake

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When it comes to performance parts, there are few brands as widely known for quality components than Edelbrock. The company has been around for nearly 80 years, and you don’t stay relevant for that long by not pushing the boundaries of high performance. This year, at SEMA 2016, was no different.

For 2017, Edelbrock has introduced several new components that we will be keeping an eye on as they may just take the LT and LS market by storm. Lets start with a part that has already done just that: the Edelbrock Cross Ram intake manifold, which was a fan favorite when we debuted it a couple months back and shows no signs of slowing down.

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The intake should be ideal for a twin turbo setup, but it has also been shown to make considerable gains on naturally aspirated applications as well. Claiming up to 27 horsepower and 28 lb-ft of torque when compared to a “popular aftermarket manifold,” we are excited to get one of these on a test build to see how well they stack up against the competition for ourselves. The manifold accepts two 90 mm throttle bodies and is said to make best power between 1,500 and 7,000 rpm.

The next piece that caught our eye from Edelbrock is the Victor Jr. LT1 cylinder head. In case you haven’t taken a look up close at an LT1 head, the intake and exhaust valves are sitting in the reverse position that they were on the LS engine. This has created some what of a “bend” in the exhaust port and has eliminated the straight-shot design of the LS head.

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“The closest thing I can tell is that GM wanted the exhaust flange to stay in the same position as the LS due to packaging concerns,” said Rob Simmons, an engineer for Edelbrock. “Basically we shifted the entire flange back so that the exhaust ports are a straight shot out.”

While this improves exhaust flow it requires the use of a special set of headers designed to work with the corrected geometry. That’s why Edelbrock has paired with Kooks Headers to produce a set of pipes that will work in combination with the new heads for most popular LT-powered platforms.

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Not only is the exhaust port geometry straightened out, but the valves have been rolled and canted to 11.5 degrees and 4.5 degrees respectively. The stock LT1 heads already come with a slightly canted valve setup but the Edelbrock heads take that even further to improve flow.

“These heads are flowing close to 400 cfm on the intake side,” Simmons said.

The pair is available with either ductile iron valve seats and hollow-stem stainless steel valves, or with copper beryllium seats for use with your own set of titanium valves. The heads fit both LT1 and LT4 engine applications.

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About the author

Chase Christensen

Chase Christensen hails from Salt Lake City, and grew up around high-performance GM vehicles. He took possession of his very first F-body— an ’86 Trans Am— at the age of 13 and has been wrenching ever since.
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