What is the benefit of ported heads?

There are many benefits to cylinder head porting. The first benefit is that it causes increased airflow through the heads and into the combustion chamber. This alone creates more power because more air in equals more power out. In heads that have not been ported, incoming air passes up and over obstructions.

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Which heads are better 706 or 862?

While 862 heads are sand cast, 706 heads are semi-permanent mold. Also, they have smaller combustion chambers, and the milling of the deck surface will allow a slightly higher compression ratio than the 706 heads. Except for this, there is only a negligible difference between 706 and 862 heads.

How much does it cost to have heads ported?

That could be a $1,000 question, if you go the fully ported route. On the low-end, you’re looking at around $200 for a professional three-angle valve job with the existing 1.94/1.50 valves. Add bowl-porting and a set of big valves and you move up into the $500-$700 range.

Should I port my LS9 heads?

If you have the means, the ported LS9 heads clearly provide the biggest performance benefits, and provide some future proofing for a relatively mild build should one choose to add forced induction later. Either way, the folks at Chevrolet Performance can help point you in the right direction.

What types of heads do you offer for CNC porting?

We have a few options you can purchase such as a pair of Stage 1, Stage 2, Stage 3, or Stage 4 LS 243/799 Cathedral casting 5 axis CNC Porting with stainless valves and WP .660 dual race springs with WP titanium retainers. These heads have been disassembled, inspected, cleaned, 5 angle valve job, and milled slightly to clean up the heads.

Is home porting bad for cylinder heads?

However, with the wrong knowledge, or an overzealous hand, home porting of cylinder heads can literally ruin a set of castings, taking them from a quality off the shelf piece to a set of paperweights in less than a minute.

Are L92 heads still in production?

These heads are no longer in production, replaced on 6.0- and 6.2-liter truck engines with the L92 head, but used castings are not uncommon or unreasonably expensive. Because of the small valves, these heads fit on small-bore applications (though the large chambers may be a bit much).