Valve Covers, Breathers, Oil Fill Caps
Pontiac V8 Valve Covers, Breathers, Oil Fill Caps
Sealed and Sorted — Valve Covers, Breathers, Oil Fill Caps for Pontiac V8s
Valve covers are the first thing anyone sees when the hood comes up, and the last thing you want leaking down the back of a fresh Pontiac V8. Height decides whether you clear roller rockers or a stud girdle; the gasket rail decides whether it seals; and the breather and oil fill layout decides how well the crankcase actually vents.
Butler stocks correct chrome reproduction covers and cast aluminum sets for a stock rebuild, and builds its own hand-fabricated, billet and CNC logo covers in house, along with breathers engraved on site, grommets, spacers, baffles, evac bungs and billet oil fill caps. Late model Pontiac and LS coil covers too.
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More About Valve Covers, Breathers, Oil Fill Caps
1. Stock and Reproduction Covers for a Factory Rebuild
If the car is going back together the way it left Pontiac, the cover is a restoration part, not a dress-up part. Butler carries the correct-look pieces for the common years.
| Chrome reproductions | Pontiac 1967-77 stock chrome valve covers, sold as a set or as a complete kit with hardware, plus year-correct 1965 389 and 1966 chrome sets. |
| Cast aluminum | RPC short cast aluminum covers in black or polished at 2 1/2" tall, a polished finned version at 2 9/16", plain chrome sets at 2 3/4", and a tall chrome set at 3 3/8" with baffles. |
| Edelbrock | Classic Series Pontiac covers in black, polished or satin, and Signature Series covers in black. |
2. Butler Custom Covers: Fabricated, Billet and CNC Logo
Butler welds, machines and engraves covers in its own shop, so the drilling and the logo are yours to call. Every set carries an extra-thick 1/4" gasket rail, which is the difference between a cover that seals and one you keep retorquing, and ships with 5/16" stainless bolts.
| Hand-fabricated sets | Made to order in raw aluminum or black, in a short 2 3/4" height for tight hood and booster clearance, or a 3 1/2" height for roller rockers and most stud girdles. Oil fill cap and installation are included, and you pick one fill location per set. |
| CNC logo aluminum covers | 3.00" overall height in black, satin with clear, or polished, priced plain with logos available in the options. Tall enough to clear most roller rockers. |
| Billet covers | Custom 6061 billet CNC sets in a short 2 3/4" and a tall 3 3/4". |
| Evac ready | A CNC logo cover with a welded baffle and a -10 AN fitting already installed, priced with a billet oil fill cap in the passenger front location. On the fab covers, adding the evac bung and baffle option means the covers ship without breather holes; GZ evac kits run a -10AN bung and Butler or Moroso kits a -12AN. |
| Drilled your way | Tell Butler where you want the breathers, oil fill and fittings in the order notes, for example oil fill driver front, breathers driver and passenger rear. Custom engraving is available. |
3. Clearance: Read This Before You Order
Almost every valve cover return starts here. Aftermarket Pontiac covers are taller and wider at the rail than a stock stamping, and three things in particular get people.
| Air conditioning | The Butler fabricated, billet and CNC logo covers will not work with factory A/C brackets. If the car keeps its A/C, that narrows you to a stock-height cover. |
| Brake boosters | Measure from the valve cover rail on the head to the booster. You need 3" of clearance. A small diameter booster solves some cars; on others the short 2 3/4" set is the answer. |
| 1967-69 Firebird | Expect a possible clearance issue with the wiper motor, and more so with thick valve cover gaskets. |
| Stud girdles | Girdles need the tall covers, 3 1/2" in the fab line or 3 3/4" in billet. A 2 3/4" cover will not clear one. |
| Finish expectations | Polished covers are machine polished, not hand polished, so they are bright but not a mirror. |
4. Spacers: The Cheap Fix for Half an Inch
When a cover is right except for height, a spacer is usually cheaper than a different set. They also raise the rail enough to clear a girdle or tall roller rockers on covers you already own.
| Butler billet spacers | Made in the shop from 6061 billet in 3/8" and 1/2", and they run raw, polished or painted. |
| Taller options | Pontiac 3/4" spacers in a pair, and polished RPC 1" spacers. |
| What to watch | Spacer height comes straight back out of your booster clearance, so measure again. |
5. Breathers, Grommets and Hole Sizes
This is the detail that catches people mail-ordering parts. Most billet push-in breathers need a 1.25" hole, and a stock Pontiac cover has a 1" hole. They will not fit.
| Butler CNC logo breathers | Billet aluminum push-in breathers in polished or black, engraved in the Butler shop with Pontiac, GTO, Judge, Trans Am, 1st Gen Firebird, Screaming Chicken, Indian, Pontiac Service or Butler logos, including 3D raised versions and a CUIN breather cut with your cubic inch. |
| Sizing | The billet push-in breathers measure 2.35" in diameter and 2" tall, and use a 1" grommet in a 1.25" hole. |
| Grommets | A 1" ID / 1.25" OD grommet is the common one for push-in breathers and oil separators. Fabricated aluminum covers use a 1" ID / 1.200" OD grommet instead, and there are baffled grommets for a 1.22" hole, including a narrow-groove version for aluminum covers. |
| Vent pipe grommet | The 1967-79 Pontiac valve cover vent pipe grommet needs a 1" hole and runs 3/4" ID to 1" OD. |
| No-grommet options | Filter and hooded breathers with washable elements drop straight into a 1.25" hole with no grommet required. |
| Stock replacements | Chrome push-in breathers for 1959-64 Pontiacs (except Super Duty) and a chrome twist-on cap for 1965-67 GTO, LeMans and Tempest. |
6. Crankcase Ventilation, Evac Systems and Baffles
A breather with nothing behind it is a hole that throws oil. On a healthy engine you want the crankcase pulled down, and you want oil stopped before it gets out.
| Oil separator breathers | Chrome and billet separators with internal foam discs and baffling, ideal for plumbing the crankcase into the air cleaner or running a header evac setup. Most fit a 1.22" hole, and positive-locking versions are available with a 1/2 NPT outlet or a tube for 3/4" hose. |
| Header evac | The Moroso crankcase evacuation kit includes separators, grommets, one-way check valves and weld-in nipples for the header collectors. It is not intended for applications with mufflers, so read that before you buy one for a street car. |
| Breather tube kit | Butler's kit plumbs an air filter housing to an oil separator on aftermarket covers and requires a 1.25" hole for the grommet. |
| Baffles | The Butler bolt-in baffle kit is a billet plate that keeps oil out of your evac bung or breather; drill the bolt holes 2" across, seal around them and use thread lock. Moroso offers a -10AN bolt-on baffle for adding a female AN fitting to steel or aluminum covers without welding, and Motion Raceworks a bolt-in evac bung with a -8AN fitting. |
7. Oil Fill Caps, Bungs and Late Model Covers
Fabricated and billet covers usually arrive without a factory fill provision, which is where the bung and cap come in.
| Butler CNC fill caps | Made in house from 6061 billet in a 1-5/8" twist cap with a 1-1/4-12 straight thread, in billet finish or black powder coat. The bolt-on bung uses a 4 on 2" diameter bolt circle with a 9/16" bung height and comes with mounting hardware and bung O-rings, and the cap can be polished to a high gloss. |
| Stock style caps | A chrome 1968-72 filler cap that fits the reproduction chrome covers, and a billet push-in oil cap that needs the 1" ID / 1.200" OD grommet. |
| Late model Pontiac and LS | Two-piece aluminum valve cover and coil cover sets in black or polished, plus C-Series and S-Series CNC engraved covers and a custom logo option. Remote mount coil relocation brackets are stocked to go with them. |
Stock rebuild or full custom, the order is the same: settle valvetrain height, measure to the booster, check your A/C brackets, then pick the cover and decide where the breathers and fill cap go. Unsure on clearance for your combination? Call before you order.
Valve Covers- Butler Custom Breathers- Butler CNC Logo Valve Covers- Stock and Aftermarket Spacers Valve Covers- Late Model Pontiac LS Breathers- Stock and Aftermarket
Not sure what your Pontiac needs?
Email our tech team at tech@butlerperformance.com. Tell us your engine, heads, car, and power goal, and we will put the parts together as one combination that works.