WebFeb 1, 1999 · For no-compromise fully ported heads, big valves are definitely the answer. If because of rules restrictions you're valve size-limited, fully porting the intake side while … WebPORTED & POLISHED SBC DART PRO 1 ALUMINUM HEADS 230CC - $1,637.90. Ported & Polished SBC Dart Pro 1 Aluminum Heads 230CC Spring 1.550 Max Lift 690, W/ 64CC Combustion Chambers Angle Plugs. These pair of heads carry a 1.550 Dual Spring, w/max lift of 690 lift. These springs are good for Solid Lifters and Roller Cams.

The Five Golden Rules of Porting Cylinder Heads - Part 7

Before you pick up the first tool, let’s look at where we will be spending all of our time. There are two basic areas of small-block Chevy heads where the restrictions lie. The easiest one to access is the pushrod restriction area, just downstream of the port opening. If you recall the discussion from the Airflow Basics … See more Like any good mechanic or tradesman, you can’t do a professional job without the right tools. The one big ticket item that most porters use is an electric grinder. These grinders often feature a variable speed control that … See more It’s also possible to improve flow beyond just working the pocket area of the intake or exhaust port. Most stock chambers tend to overhang the … See more If you think about it, this chapter embodies all the basic concepts from this entire book into something that the reader can apply to almost any cylinder head. The proper execution of intake and exhaust porting has less to do … See more WebDec 12, 2024 · Standard Gen-I small-block Chevy heads position the valves at a 23-degree angle to the deck. In 1989, Chevy introduced the 18-degree Bow Tie aluminum head that shifted the valve-angle vertically, while simultaneously raising the intake port to take advantage of this angle. green sanctuary summary

Guide to Chevy Small-Block Production Heads - Chevy DIY

WebOur CNC Fully Ported heads have more developed and larger intake ports than Stage 1 Ported heads. They feature fully CNC machined intake ports, exhaust ports and … WebMay 12, 2016 · That’s where a little bit of pocket porting work and radius work can have a measurable effect on power – if performed correctly. To illustrate this, we ran a test many years ago on a set of iron 1.94-/1.50 … green sanctuary