The Pontiac OHC six was first introduced as a 230-cube engine, it was the standard engine for the 1966 Tempest/Lemans line through 1969 when it was discontinued and replaced by the Chevy 250 six for 1970. From 1967 to 1969 it was also the standard engine in the new Firebird line. In 1968 it grew to 250 cubes, these engines all came standard with a one-barrel carb. A 4-barrel 'Sprint' version (used the Quadrajet carb) with a hotter cam and a free-flowing split exhaust manifold was offered on both the 230 and 250 OHC sixes. These unique engines share very few parts with the same cubic inch size Chevy sixes.
Parts are somewhat hard to find, especially the camhaft. There is one main outlet that I know of for Pontiac OHC six parts: http://primatechmotorsports.com/pmihome.htm OHC six message board, not a lot of action there but you can mine some info from it: http://sohcsix.yuku.com/directory
You can use Hudson hornet 308 5 inch stroke. torque for days.edmunds high comp. head and twin h intake with 2 carter wa-1's and jahns slugs 60 over good times.
barlow said, I don't get anyone using a inline 6,less your racing in a cl*** that said you must. 4 less $ ya can have manytimes the power with a V8. I had to wait a week or so for my blood pressure to return to normal. Sixes are fun. That is why we build them . They are also interesting. As for the V8 makes many times the power. That is utter nonsense. The Ford 300 six is bar none the best motor Ford ever built. I did one for Bob Gauleys T bucket with the last block done in 1993. Car competed a full schedule every year including this one till it was sold a week ago. Same block and same head and valves. Maintained but not rebuilt. Car was never out of the top 5 at local track for at least the last 8 years and in 2005 won the years championship. The V8 guys were trying to get the track to ban 6 cylinders and it wasnt because they were too slow. The cylinder only cares if it has good air flow and good compression. What crank it is fastened too and how it is fastened doesnt matter a hoot. (inline or V configuration) The 250 chev is probably the least expensive to build . I did machine work and cam design for one that won the NEW York State Vintage Stock car 2nd place . That car wound up in a museum in Michigan for a while and even got to blast around IRP a time or too. It is currently being run in Florida and is called FourAmerica. (35 chev sedan) My shop sticker is still on the velocity stack so i am told. That engine despite it good perfomance cost so little that i wont even say how much because no one would believe it anyway. The slant 6 which is where my heart is is also a fun motor to build and run. Yeah they take a little imagination and parts often have to be made, not bought, but they sure are a lot of fun for not much $$$$$. The 7 main thing BTW is overdone. They are not bad or anything but 4 is sufficient. Think for a moment of you V8 engine . Does it need 9 main bearings? Nope 5 is sufficient. One at each end and one between each PAIR of rods. So if that is so then it stands to reason that like in a slant 6 for instance 4 mains is enough with two rods between. Nothing wrong with the extras except maybe a bit more drag but dont dismiss an engine just on the basis it has only 4. More is nice maybe but ENOUGH is just that. ENOUGH. Don
dolmetsch, if you like the slant sixes, you'd love the 215-245-265 chrysler sixes we got here, they are cranking 350hp out of the 265s and still able to drive them anywhere anytime. oh and a vote for the hudson big six, i finished porting mine yesterday and they are some big holes now. then i sat a piston and rod out of it next to some out of my friend's holden six and laughed. 8" rods anyone? haha
hi from kev downunder we have sixes down here called holden red moters ihave run them in my rides since 1964 i still have three in the shed and 1 i have just put in my grandsons 34 3w coupe ,i have run them with triple su ,s triple webers a single 780 rochester and a to5 garett turbo the turbo was by far the most grunt , they will spin to 7 grand and are cheap to build later this year i will build a topalino sedan delivery and use my best one i have had it in 4 of my rides
Don When your putting the 1.88 or 1.84 valves in a 292 head, do you put the harden seats in as well, I have a guy around here and he is afraid to cut in new seats because of the water jacket, could you help us out.....Thanks. Mike
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