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1942 to 1957 Pontiac Forum & Registry Topics pertaining to 1942 - 1957 models.

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Old 02-17-11, 11:50AM   #1
marks73ta
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Default Pontiac straight 8s.

Any good sites/forums that cover the old straight 8. Just watched a concours park road hill climb on u-tube and thought it would be fun to make an old road race type homebuilt road race rod. I'm wondering if there were any better/best years/sized/part motors that would be the best engine to start with? You could use a cheaper late model 5 speed or even a saginaw 4 speed and add on one of the 3 speed overdrive units for the road. A 2X3 frame. Most any cheaper late model rearends, 10 bolt?? or even a Mustang 8.8. build the body out of sheet steel or even aluminum if affordable. Some tall skinny wheels and tires.
It would be fun to build the st8 8 solid and even add a GM supercharger to it for a little extra oomph.
Even a OHCam Pontiac 6 would work. And maybe a little cheaper in the long run. There I go overthinking again. Any thoughts and direction to forums on the st8 8 would be appreciated. This is just a mind/imagination excersize at this point though. Thanks guys. Mark L
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Old 02-17-11, 03:31PM   #2
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Not worth the trouble to build a s8 even if you can find one, bearings...etc are a PITA to find and expensive. do you have a Jay Leno bank book.
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Old 02-17-11, 06:12PM   #3
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Default ST8

Check around for "inliners clubs" we have one here in Nenada in the Carson City area and they seem to be able to find parts and speed equipment, some are pretty fast too.
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Old 02-17-11, 08:24PM   #4
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Mike (Mb125) that's why I wanted to get a feel for just that. 421Mike, thanks for the info. I'll look into that. Probably never materialize but thought I'd check it out and see what all would be involved. Thanks for you're help guys. Mark L
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Old 02-17-11, 11:22PM   #5
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My machinist in NY worked on a few Hudson straight 8's, they required hand poured and scraped bearings and the machine work to the block and head were astronomical because of tooling and hours of labor.
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Old 02-18-11, 10:23PM   #6
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I also forgot that they are flat head motors. Must have been thinking of the Buick straight eights. I was just getting one of those expensive brain farts there for a moment. I'm having enough trouble just getting my present project running let alone anything else. Next time just tell me to go away. heh!! Mark L
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Old 03-12-11, 02:41AM   #7
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str8 a pretty kool. I once had a mucollock (sp?) supercharger kit for one. very high quality materials al around. insert bearings not babbit. lots of wow factor
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Old 03-17-11, 08:27PM   #8
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But the flat head bums me out (old Hippy term, heh). But woul dstill love to build a straight 8. Maybe a Buick or?? someday, for a light wt street roadster. Mark L
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Old 05-05-11, 01:11AM   #9
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hudsons made a str8?
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Old 05-05-11, 04:34PM   #10
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Yes with a big old flat head
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Old 05-27-11, 01:25AM   #11
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I know they made successfull flat head 6 but an str8?
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Old 08-30-11, 08:36PM   #12
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Default straight 8

Ive got a 1947 flatty 8 that I rebuilt14 years ago. It runs real good and is stock. They have regular insert bearings like the newer engines and gets 40 pounds of pressure at about 2500 rpms. These engines were known as 100,000 mile reliable when it was unheard of to get that many miles from other cars. It is as responsive as a 250 Chevy straight 6, and will pull 18 miles a gallon on the highway with 3.70 rear gears. If you can build a 1953 or newer block because the new pistons are much cheaper than the older ones. Parts are definitely out there for them. Steve
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Old 09-26-14, 08:22PM   #13
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the eights were pretty cool.. one piece of advice I would recommend is to clean out the oil pan and tha valve adjustement covers and the area around there, I used an industrial vacuum and wood chisel to scrape enough away'

another good piece of advice would be to photocopy for reference any gaskets or complete gasket set you aquire for a six or an eight. that way you can make about any gasket as needed. they are all cork or mostly paper anyway except the head gasket.
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Old 10-12-14, 04:05PM   #14
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INLINERS INTERNATIONAL
http://www.inliners.org/

This can possibly lead you to many other resources.

As fas as straight 8 performance potential the Buick would be a better choice.
They were overhead valve and there were some hot rod parts for those back in the day.
They still require cooling and oil system mods to protect things the more you push on them.
Seen a couple of the Buick I-8s on old dry lakes coupes as recent as year 2002.
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