Page 65 of Hooker Headers Exhaust Systems & Accessories by Holley Performance Products, Inc.

street force headers truck force headers competition headers what is the difference between your super competition and competition headers hooker super competition headers are built from lightweight 18 gauge mild steel tubing with tuned lengths for maximum performance super competition headers also use long transition collectors for reduced backpressure and increased exhaust flow 5/16 machined flanges with welded o-rings make for a perfect sealing surface · super competition headers come with many different options in tube diameter and length for a particular application super competition headers are the world s best header will your headers fit with my other performance equipment in most cases hooker headers are developed around the stock engine location using stock equipment aftermarket products such as rigid motor mounts locate the motor in a different location causing possible fitment problems other performance products such as kickout style oil pans and performance mini starters can interfere with some header applications check the listing read the footnotes in our full line catalog or contact our tech department at 270781-9741 ss stainless headers super competition headers do you have a warranty competition headers are built from durable 16 gauge mild steel tubing competition headers use long transition collectors for reduced backpressure and increased exhaust flow 5/16 machined flanges with welded o-rings make for a perfect sealing surface · by removing some of the constraints on our designers when they design a super competition header we can produce a competition header for easier installation and a lower price the comp header will weigh slightly more than the super competition header but will last slightly longer under extreme climatic conditions competition headers are the world s second best header we will sometimes spend two to three times more just to make a super competition header work only five to ten percent better yes,hooker performance exhaust products are covered under the standard holley performance 1 year warranty see the last page of this catalog for complete warranty and contact information race headers competition super comp exhaust kits what tube size do i need and is bigger better header primary tube sizes vary on many factors engine combination transmission type gear ratio and intended use of the vehicle for example a truck header will be designed using longer length and smaller diameter primary tubes to enhance low to mid-range performance where a header for a pro stock race car will have larger primary tubes and large collectors for the highest flow available bigger generally is not better when it comes to street driven cars when you put too large of a header or exhaust on a street driven vehicle you usually notice a severe drop in low to mid-range performance due to a lack of backpressure to combat this issue hooker sometimes builds 3 or 4 different headers for a particular application with varying tube and collector sizes diesel exhaust systems mufflers how thick are your flanges and are thicker flanges better not necessarily the key to a good flange is to seal at the exhaust port locations hooker flanges are machined using a milling process to a surface flatness of or .0025 between the bolt holes this process guarantees a proper seal at the port locations virtually eliminating flange leaks other header manufacturers simply run their flanges over a belt sander or body grinder hooker flanges are 5/16 except on some unique applications which is heavy enough to keep the header integrity but is pliable enough to seal each exhaust port this helps compensate for variables in the head surface overly thick flanges are not as pliable and tend to have leaks hooker flanges seal the first time every time catback systems should i use exhaust wrap on my hooker headers if your vehicle is being run on the street or for extended periods of time you should never wrap headers exhaust wraps insulate the exhaust too much and the exhaust temperature is raised to a level that fatigues the header material causing cracks if under hood temperatures are an issue we recommend using hooker s metallic ceramic thermal barrier coating our coating is applied inside and out it is corrosion and heat resistant up to 1600°f it also reduces underhood temperatures and has a polished high luster finish holding exhaust temperatures inside the header increases the exhaust gas velocity producing more horsepower you can purchase any hooker header with our metallic ceramic thermal barrier coating by adding a -1 to the end of the part number exhaust tips components accessories header collector gaskets will your headers fit with aftermarket cylinder heads most aftermarket cylinder head manufacturers offer stock replacement and racing heads hooker headers will accommodate the stock replacement head in most cases if the aftermarket head uses an angle plug configuration the hooker header for that application will have footnote 62 which says that it will fit with angle plug heads if your aftermarket head is a straight plug stock replacement the hooker header for your application will fit most aftermarket racing heads have raised exhaust ports most hooker headers are designed around the stock port height and will not accommodate the raised port heads hooker will produce headers for raised port heads when that particular head becomes the standard for example super competition header #6225 fits 1979-93 mustangs with the popular tfs twisted wedge race head photo gallery tip breaking in an engine with ceramic coated headers will result in damage to the coating and will void all warranties ceramic coated headers require several heat cycles to fully cure before they will withstand extreme heat hooker recommends using cast iron exhaust manifolds or old headers to break in new engines to avoid coating damage please call hooker tech service at 270-781-9741 for additional information regarding ceramic coated exhaust products footnotes part to page index warranty tech line 270-781-9741 65

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