Discussion in the hokey ass message board started by dirtyt, may 21. Hot rodding the slant six porting the head youtube. Camerons head is by far the best slant six head i have ever seen. Feb 01, 2006 compress itthe basic slant six has always done well with its 7. Im in the process of porting a 1980 pu cylinder head.
See all 31 photos the slant six head can safely withstand a 0. Our slant six head was only flowbench tested stock and after fully porting the entire port. A super six intake will give you a couple mpg more and about 10 hp. Cameron put a lot of work into that head and it really shows. I need a lot of books because they do not have a slant 6 performance upgrades for dummies. Compress itthe basic slant six has always done well with its 7. Mistress slant 6 cylinder head and valvetrainpart 3 microphonicfool. A guide to mopar v8 cylinder head and block casting numbers. 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.
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 chrysler slant6 engine was a cleansheet design, led by willem weertman, later chryslers chief engine designer. Head gasket slant 6 big bore as0193 aussiespeed street. It has six bolt holes, but they are located in a different pattern than the a or b engines. 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. 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. A head can be engineered for maximum power, or for minimum fuel. Any higher, and a mildly cammed slant six wont like running on pump gas. Turbocharging the slant six for power and economy revisiting the turbocharged slant six. Cylinder head design, porting, and repair has been a main focus for the stiegemeier team since 1979. Oct 19, 2011 the slant six with the huge demand of scrap iron has all but vanished from around here. 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. Slant six engine performance upgrades chrysler abodies.
Mistress slant 6cylinder head and valvetrainpart 3 youtube. 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. Now 60 years old, your slant six could probably use some freshening up. Overweight, bulky, and inefficient, the creaky old l head. Chrysler slant six cylinder engine mopar muscle magazine. The kindle ebook is instantly available and can be read on any device with the. The simple fact is that the sl6 head was designed to support 170 cubic inches port layout. There are enough flow numbers on our website to keep everyone busy for a while. 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. The aussiespeed hurricane was so well accepted by the world that the aussiespeed range of slant 6. 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. Slant six turbos mike holler and bob oneill discuss. Cylinder head services livernois offers something that most of our competition just cant match, complete in house cylinder head development from start to finish. 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.
Although production heads can be ported and modified to accept modern. Head porting is time consuming and tedious, but absolutely necessary to unlocking the power potential of a stock cylinder head. 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. With the classic poppetvalvestyle engine, air cannot make a straight shot into the cylinder. But the good news is the head has so much material in it that whacking off 11410 inch or so from the. Can some one explain why hp 383s came with large port heads. The casting numbers for smallblock mopar and bigblock mopar are a sevendigit number, which is raised, and usually found in one of two locations. B engine are covered in other engine manuals located elsewhere in this book. 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. Slant six racing manual carburetor ignition system scribd. The aluminumcylinderhead program was also running into trouble. 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. Im using a pitot tube to calculate port velocity in feet per second. The chrysler slant six engine 170198225 by the allpar staff with numerous contributions from daniel stern.
Engines valiant dart slant six engine list with horsepower ratings the slant six. Cylinder head gasket for chrysler slant 6 temel gaskets. 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. On the underside of the head on an intake runner, and under the valve cover on an intake runner. 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. Slant 6, manual trans 4 wheel drive big heavy truck. 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.
The slant six became a legend for its endurance, but for a few brief, shining moments, it was a true performance engine as well. Started porting an extra 1968 head for my slant six. They get the cheapest cylinder head design cheap to make and good for gas economy. We are undoubtedly south africas leading cylinder head specialist one stop shop and are capable of preparing very hightech quality heads. Porting cylinder heads generally refers to the process of enlarging the intake and exhaust ports of an engines cylinder heads. Porting is usually done to increase airflow and horsepower at high rpm. If i ruin a head to crossection it, why dont i just. Later slants have hydralic cams and a different head but its all interchangable. 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. Even at this output level, the slant six will benefit from a little valve and port.
The book also covers modifications, showing how to squeeze the most out of your engine. 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. Longtime mopar engineer, racing coordinator, and veteran author larry shepard provides thorough instructions for each crucial step of the rebuilding process. Porting a slant six head for a bodies only mopar forum. The flywheelflex plate attaching bolt pattern for the six is unique. How to build a slant six for performance axleaddict. The track t was completely homebuilt by randy nelson and features dodge slant 6 power that was inspired by tex. Chryslers aluminum slant six wasnt alone in preparing to drive the vws, renaults and simcas back into the ocean. With this book, you can confidently complete your hemi rebuild and get your car or truck back into action. The first manifold we will look at is a holden 6 cylinder. 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. 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. Cams, headers, carburetion can only go so far making horsepower without the cylinder head. I was wondering what to do with the small emissions breather holes in each exhaust bowl.
I found this book to be extremely indepth and well thought out, with lots of detail for those. Team resurrects and hot rods mopars indestructible 6 cylinder, the bulletproof 225 dodge slant six. We must mention that dutra just wrote a new book, chrysler slant six. The 198 and 225 listed above are large pilot cranks. Every 1960 slant six engine was so equipped but cost cutting got the best of it.
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. Oct 18, 2016 hyperpak 1960 valiants starred at daytona in first nationwide broadcast of live auto racing. 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. In addition, we also do flowtesting and will provide camshaft recommendations for your specific performance needs. 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.
How to increase low end torque by porting heads it still runs. The time slant six engines dominated a nascar race roadkill. Chevy w block 348409 cylinder head casting numbers. Read george reids new book, ford 351 cleveland engines. 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. Has anyone ever put a slant 6 head on a flow bench and did a before and after test with stock valves vs oversized. Part 1 of porting bob oneills cylinder head, by mike holler. The engine block has been modified to within an inch of its life, as has the cylinder head. The cylinder head gasket for chrysler slant 6 engines is available at temel gaskets.
This reduces chamber volume from 54 to 44cc and bumps compression from 8. 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. 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. On the underside of the head on an intake runner, and under the valve cover on an intake. 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.
As a point of interest it is almost impossible to make a port to big on a mopar wedge engine. One of the most important parts of an engine assembly is the cylinder head. You should also have the block andor heads milled to give you a compression ratio between 8. A square port slant 6 or hemi six port is totally different again. An exotic slant six hemmings daily hemmings motor news. Just as with any v8 cylinder head, carefully grind and remove the ridged area right.
Getting the correct port velocities and that sort of thing right has been a big challenge. The first would be on the top of the intake runner, under the valve cover. Big block chevy oval port cylinder head casting numbers. I ordered mine from amazon, i am still waiting for it.
I think it might be misleading to say that mike used 30 degree seats on the intakes for his race heads. 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. This is a feature car in the october 2011 issue of hot rod magazine. One of the things you will learn when porting cylinder heads is that you have. Nov 15, 2011 in america, six cylinder engines are strictly for granny and the tightwads. But the good news is the head has so much material in it that whacking off 11410 inch or so from the surface. Developing highly functional ports in cylinder heads part 8. Mopar muscle magazine asked us to send them a tech article on. Looking at the flowbench numbers, its apparent the exhaust ports airflow improved more from our. Slant six cylinder head porting and the book of secrets. Chrysler 6 performance book dutra for a bodies only. Chrysler master tech 1959, volume 1212 the new 6 cylinder ohv.
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 second location is on the underside of the intake runner on the cylinder head. 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. Heads with smaller ports unported usually provide better lowend torque than ported heads. The graphite gasket in the video is called a sureseal, and is available from pentastar parts in australia. We port and shave a slant six cylinder head for muchneeded power.
According to the 1962 blue book, the optional aluminumblock 225 for valiants and. I did a turbo installation on a slant six duster about 5 years ago and took pictures. Few handy hints on fitting inlet manifolds and headers on my slant 6 1966 valiant. Slant six cylinder head and the revised combustion chamber. Heres a quick overview of what weve done and the areas to pay. There are a lot of shops that offering porting, or cnc porting, or cylinder head machining. Use expert advice to rebuild your slant six engine to make it run like it did on. 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. It also offers the opportunity to make more horsepower. The cylinder head gasket is used in chrysler, dodge, jeep, perkins and plymouth which has engine with 6 cylinder. As mentioned by dennis s, mike js flow bench is now in indy. 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. Cylinder head all slant six cylinder heads are interchangeable. Cylinder heads, as manufactured, are usually suboptimal due to design and manufacturing constraints and choices.
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