Mopar muscle magazine asked us to send them a tech article on. Slant six turbos mike holler and bob oneill discuss. Slant six racing manual carburetor ignition system scribd. Heres a quick overview of what weve done and the areas to pay. With millions of slant six engines built over the 30plus years that the engine was produced, its always a good idea to have this book handy, as you never know when the next leaning tower of power will. The book also covers modifications, showing how to squeeze the most out of your engine. In addition, we also do flowtesting and will provide camshaft recommendations for your specific performance needs. The book does give you some power secrets for example, he notes that theres points on the cylinder head that need to be machined to fit higher lift camshafts. Few handy hints on fitting inlet manifolds and headers on my slant 6 1966 valiant. Looking at the flowbench numbers, its apparent the exhaust ports airflow improved more from our.
More than half a century has passed since the old chrysler corporations leaning tower of power briefly became the mosttalkedabout racing engine in america, yet folks at the recent slant six gathering near san francisco were still overheard reliving the daytona domination by a fleet of. The engine block has been modified to within an inch of its life, as has the cylinder head. Longtime mopar engineer, racing coordinator, and veteran author larry shepard provides thorough instructions for each crucial step of the rebuilding process. We port and shave a slant six cylinder head for muchneeded power. Slant 6, manual trans 4 wheel drive big heavy truck. Engines valiant dart slant six engine list with horsepower ratings the slant six. I found that the 1968 head vs 1979 peanut head was pretty much gasket matched versus my peanut 79 head which had offset matching of port. One of the things you will learn when porting cylinder heads is that you have. A lot of shops wont have a torque plate for the slant six, and it will add to the cost, but the extra hassle and expense are well worth it imo. As mentioned by dennis s, mike js flow bench is now in indy. Slant six cylinder head and the revised combustion chamber. When i asked him about improving the flow on the head he did for my street car, which does have 30 degree seats, the first thing he said is that we would have to go to 45 degrees on the intakes. May 08, 2015 theres no question cylinder head porting can be a very effective way to improve the volumetric efficiency and overall airflow capabilities of any cylinder head. The first manifold we will look at is a holden 6 cylinder.
The slant six valiant range of aussiespeed performance products is popular not just here in australia but with many of the slant 6 community in the usa, south america and parts of europe. But even bumping the page count up to match one of the slant six engine sizes take your pick even 170 pages would be nice if 198 or 225 werent an option would have let doug get some information in print about cylinder head porting. The aussiespeed hurricane was so well accepted by the world that the aussiespeed range of slant 6. This is a nonfiction book on the history, assembly, rebuilding, tuning, and improving of mopar slant six engines.
It also offers the opportunity to make more horsepower. Camerons head is by far the best slant six head i have ever seen. Even at this output level, the slant six will benefit from a little valve and port. Use expert advice to rebuild your slant six engine to make it run like it did on. The second location is on the underside of the intake runner on the cylinder head. Although production heads can be ported and modified to accept modern. If i ruin a head to crossection it, why dont i just.
Chrysler 6 performance book dutra for a bodies only. A super six intake will give you a couple mpg more and about 10 hp. Before making any changes that may affect performance or durability, please understand that the information and opinions presented here have not been verified and that you proceed at your own risk. Nov 15, 2011 in america, six cylinder engines are strictly for granny and the tightwads. Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve the speed and quantity of the air flow. Mistress slant 6cylinder head and valvetrainpart 3 youtube.
Cameron put a lot of work into that head and it really shows. Chrysler master tech 1959, volume 1212 the new 6 cylinder ohv. I think it might be misleading to say that mike used 30 degree seats on the intakes for his race heads. Discussion in the hokey ass message board started by dirtyt, may 21. Every 1960 slant six engine was so equipped but cost cutting got the best of it. Slant six cylinder head and the revised combustion chamber by doug dutra many performance minded sl6 owners know that there is a lot of extra performance hidden inside the engines cylinder head. The time slant six engines dominated a nascar race roadkill. The kindle ebook is instantly available and can be read on any device with the. He also said the slant six drag scene was a lot of fun, but he is totally done with that and moving on to other adventures.
There are a lot of shops that offering porting, or cnc porting, or cylinder head machining. Chryslers aluminum slant six wasnt alone in preparing to drive the vws, renaults and simcas back into the ocean. Cylinder head design, porting, and repair has been a main focus for the stiegemeier team since 1979. See all 31 photos the slant six head can safely withstand a 0. The flywheelflex plate attaching bolt pattern for the six is unique. I found this book to be extremely indepth and well thought out, with lots of detail for those. We are undoubtedly south africas leading cylinder head specialist one stop shop and are capable of preparing very hightech quality heads. Compress itthe basic slant six has always done well with its 7. Read george reids new book, ford 351 cleveland engines.
The cylinder head gasket for chrysler slant 6 engines is available at temel gaskets. And he covers such tricks as mixing and matching connecting rods and cranks from different applications, including the method doug pioneered of putting chrysler 2. Chevy w block 348409 cylinder head casting numbers. Cylinder head all slant six cylinder heads are interchangeable. Porting cylinder heads generally refers to the process of enlarging the intake and exhaust ports of an engines cylinder heads. The slant six became a legend for its endurance, but for a few brief, shining moments, it was a true performance engine as well. On the underside of the head on an intake runner, and under the valve cover on an intake runner. I ordered mine from amazon, i am still waiting for it. The first would be on the top of the intake runner, under the valve cover. We will look at these 3 engine types here and explain what we have learnt over recent years while developing the range of aussiespeed street and race manifolds. Developing highly functional ports in cylinder heads part 8.
There has to be a bend in the port to accommodate the valve stem and, worst of all, the air must make its way around the head of a valve. A guide to mopar v8 cylinder head and block casting numbers. Mistress slant 6 cylinder head and valvetrainpart 3 microphonicfool. Heads with smaller ports unported usually provide better lowend torque than ported heads. Part 1 of porting bob oneills cylinder head, by mike holler. Use expert advice to rebuild your slant six engine to make it run like it did on the showroom floor or modify it to perform even better. Im using a pitot tube to calculate port velocity in feet per second. I have ported a lot of them slant sixesover the last 37 years though as well as the ford six so have a good feel for the no no areas. Slant six cylinder head porting and the book of secrets. Oct 19, 2011 the slant six with the huge demand of scrap iron has all but vanished from around here. Porting is usually done to increase airflow and horsepower at high rpm.
Jan 16, 2015 developing highly functional ports in cylinder heads part 8 january 16, 2015 by muscle car diy in chapter 1, i brought attention to the fact that the numberone impediment to flow on both the intake and exhaust side of things is the valve seat. Later slants have hydralic cams and a different head but its all interchangable. With millions of slant six engines built over the 30plus years that the engine was produced, its always a good idea to have this book. An exotic slant six hemmings daily hemmings motor news. But the good news is the head has so much material in it that whacking off 11410 inch or so from the. How to increase low end torque by porting heads it still runs. With the classic poppetvalvestyle engine, air cannot make a straight shot into the cylinder. Our slant six head was only flowbench tested stock and after fully porting the entire port. Cams, headers, carburetion can only go so far making horsepower without the cylinder head.
Chryslers offering, the plymouth valiant, was paired with its redesigned 6cylinder engine entrant, the slant six, known by its nickname the leaning tower of power. Feb 01, 2006 compress itthe basic slant six has always done well with its 7. They get the cheapest cylinder head design cheap to make and good for gas economy. I did a turbo installation on a slant six duster about 5 years ago and took pictures. One of the most important parts of an engine assembly is the cylinder head. This reduces chamber volume from 54 to 44cc and bumps compression from 8. A head can be engineered for maximum power, or for minimum fuel. On the underside of the head on an intake runner, and under the valve cover on an intake.
Turbocharging the slant six for power and economy revisiting the turbocharged slant six. B engine are covered in other engine manuals located elsewhere in this book. The chrysler slant6 engine was a cleansheet design, led by willem weertman, later chryslers chief engine designer. How to build a slant six for performance axleaddict. The 198 and 225 listed above are large pilot cranks.
The aluminumcylinderhead program was also running into trouble. With this book, you can confidently complete your hemi rebuild and get your car or truck back into action. My best guess, to get to the compression ratio you desire, is to reduce the cylinder head combustion chamber volume about 6 cc from stock measurements. Use expert advice to rebuild your slant six engine to make it run like it did on the showroom floor or modify it to perform even better author doug dutra walks you through every aspect of disassembly, evaluation, rebuild, and reassembly in an easytoread, stepbystep format. Porting a slant six head for a bodies only mopar forum. Getting the correct port velocities and that sort of thing right has been a big challenge.
A square port slant 6 or hemi six port is totally different again. I was wondering what to do with the small emissions breather holes in each exhaust bowl. The chrysler slant 6 story posted on june 1, 2016 by mcg chryslers slant 6 of 19601987 is remembered today as one of the most rugged and dependable engines in motor city history. There are enough flow numbers on our website to keep everyone busy for a while. According to the 1962 blue book, the optional aluminumblock 225 for valiants and. Now 60 years old, your slant six could probably use some freshening up. I need a lot of books because they do not have a slant 6 performance upgrades for dummies. The chrysler slant six engine 170198225 by the allpar staff with numerous contributions from daniel stern. Overweight, bulky, and inefficient, the creaky old l head. Slant six engine performance upgrades chrysler abodies. Cylinder heads, as manufactured, are usually suboptimal due to design and manufacturing constraints and choices. Sac engineering successfully gas flowed more than 20 000 cylinder heads over the past 33 years and have built at least 2000 very special raceready cylinder heads. You should also have the block andor heads milled to give you a compression ratio between 8.
Has anyone ever put a slant 6 head on a flow bench and did a before and after test with stock valves vs oversized. Started porting an extra 1968 head for my slant six. The track t was completely homebuilt by randy nelson and features dodge slant 6 power that was inspired by tex. Any higher, and a mildly cammed slant six wont like running on pump gas. It has six bolt holes, but they are located in a different pattern than the a or b engines.
Can some one explain why hp 383s came with large port heads. Cylinder head gasket for chrysler slant 6 temel gaskets. This is a feature car in the october 2011 issue of hot rod magazine. Slant six engine expert doug dutra has produced this volume to walk you through every aspect of disassembly, evaluation, rebuild, and reassembly in an easytoread, stepbystep format. Slant 6 chrysler the slant six valiant range of aussiespeed performance products is popular not just here in australia but with many of the slant 6 community in the usa, south america and parts of europe. You can get performance heads for the v8 so why not make them fit on the 6, since there is no performance head for the 6.
Hot rodding the slant six porting the head youtube. Head porting is time consuming and tedious, but absolutely necessary to unlocking the power potential of a stock cylinder head. The casting numbers for smallblock mopar and bigblock mopar are a sevendigit number, which is raised, and usually found in one of two locations. The aussiespeed hurricane was so well accepted by the world that the aussiespeed range of slant 6 parts is one of the largest ranges produced by one manufacturer in the world. During his initial research with the engine platform, he found that there was an inherent problem with the cylinder rigidity in the inline six casting, so the fix was in before he ever built the rest of the engine. We must mention that dutra just wrote a new book, chrysler slant six. Head gasket slant 6 big bore as0193 aussiespeed street. But even bumping the page count up to match one of the slant six engine sizes take your pick even 170 pages would be nice if 198 or 225 werent an option would have let doug get some information in print about cylinder head porting, cam selection, and other ways to get more power out of these motors. Cylinder head services livernois offers something that most of our competition just cant match, complete in house cylinder head development from start to finish. The simple fact is that the sl6 head was designed to support 170 cubic inches port layout. The graphite gasket in the video is called a sureseal, and is available from pentastar parts in australia. Chrysler slant six cylinder engine mopar muscle magazine. Im in the process of porting a 1980 pu cylinder head. Chryslers offering, the plymouth valiant, was paired with its redesigned 6 cylinder engine entrant, the slant six, known by its nickname the leaning tower of power.
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