HIGH PERFORMANCE
CAST IRON EXHAUST MANIFOLDS 
Shootout Manifolds!
Imagine blasting down the ¼ mile in 11 seconds, returning to the pits, opening your hood and seeing an engine that would appear at home in a show car, right down to the Factory Cast Iron Exhaust Manifolds! This is no longer a fantasy, this is reality!
Extensive flow bench research has gone into these shootout manifolds. Gessler Shootout Exhaust Manifolds start off as factory cast iron exhaust manifolds that are modified to reduce exhaust restrictions allowing your engine to create more horsepower! Your car will produce more HP and quicker ET’s, while maintaining that original pure stock look!
All makes and models are modified. Each manifold is specifically modified to address specific problem areas within that manifold. Exhaust manifolds are not created equally. Generally, poorer flowing manifolds tend to have more potential for improvement. Each cylinder (runner/passage) is modified based on its specific needs. Material is only removed where needed, thereby maintaining exhaust gas velocity. Most manifolds have several poorer flowing runners that require greater modifications than the better flowing runners. Once modified, manifolds tend to have a better port flow equalization. Depending on the manifold casting and intended application the outlet size may vary.
Some of the exhaust manifolds that we have modified:
Buick 350 - 400 - 455
Buick Nailhead
Chevy SB Log
Chevy SB Rams-horn
Chevy BB
Chevy Corvette BB
Chevy BB Tube-style
Chrysler 340, 383
Chrysler 440-HP
Ford 289
Ford 429
GMC 6.2/6.5 Diesel
Nissan Turbo Diesel
Olds 350 - 400 - 455 Log
Olds 455 W-30 (W/Z castings)
Pontiac D-Port Log
Pontiac D-Port RamAir
Pontiac Round Port RamAir
For more information regarding specific GHP Shootout exhaust manifolds, Click here.
- Original Factory cast iron exhaust manifolds are used.
- Stock external appearance is maintained.
- All makes and models modified.
- Designed to work with 2 ½” exhaust pipes.
- Optional performance modifications are available.
- Confidentiality assured, we never disclose customer’s names without permission.
EXHAUST MANIFOLD OPTIONS
| LEVEL 1 - Shootout Manifold | Price starts @ $375.00* |
This level of modifications gives the best return on exhaust manifold porting dollar and is recommended for 90% of our customers. Restrictions and flow loses are reduced within casting limitations. Exhaust Manifold port openings should always be larger than the cylinder head exhaust ports. We enlarge the manifold port openings to inhibit reversed flow, which helps to improve idle quality. Manifold outlets are enlarged, butterfly heat valve flap and shaft are eliminated and shaft holes are plugged. All modifications are dependent on your specific manifold castings. Not all manifolds require or even allow all modifications.
| LEVEL 2 - Super Shootout Manifold | Call for pricing.* |
This modification includes LEVEL 1 enhancements PLUS custom welding to increase flow and further reduce restrictions. Welding can be used to enlarge passages and outlets, re-contour port passages or help to encourage exhaust gases to flow in the least restrictive direction. Custom head pipe flanges may be required. LEVEL 2 exhaust manifolds are designed for serious stock appearing cars (800+ HP!) interested in squeezing out every available horsepower.
Jim Haas's 1970 Chevrolet Nova 350 LT1 competes in the F.A.S.T. race series and has run a best of 11.83 @ 119 MPH using a set of our LEVEL 2 log-style exhaust manifolds. One of the fastest Small block car in the F.A.S.T. race series.
OPTIONAL LABOR
* Note: All prices are with core exchange, Prices vary with specific Manifold Casting. |