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12-30-2008, 12:39 AM | #1 |
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Join Date: Nov 2008
Location: palo alto, CA
Posts: 47
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straight six performance
i have a 270 GMC straight six that runs great, but its hard to keep up with the v8's, i NEED more power, how and where??!! i've looked all over the internet and i've only found one place that sells some stuff and thats Clifford Performance, my 59' has the stock 3.91 gearing if that makes a difference
THANKS!!!!! |
12-30-2008, 05:11 AM | #2 |
Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,057
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Re: straight six performance
You might try www.inliners.org -- they love the older L6s.
Also www.stovebolt.com -- a site for GM trucks '72 and before. www.stoveboltengineco.com -- no relation to the above, Tom Langdons' site. Patrick's in Casa Grande AZ deals exclusively in that vintage, but I don't know if they're online. Hope this helps.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
12-30-2008, 09:53 AM | #3 |
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Join Date: Apr 2003
Location: Central PA....In the Berg of Nisbet
Posts: 790
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Re: straight six performance
I can't out run a light V8 powered truck on the flat, but my little straight 6 will eat them loaded on the hills!
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'72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!! |
12-30-2008, 03:12 PM | #4 |
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Join Date: Dec 2004
Location: Northern AZ
Posts: 7,271
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Re: straight six performance
Honestly, pick up a more common 250 or better yet a 292 and you may well beat up on the v8 guys!! The early 6's are OK if you are stuck with all OE type resto, but for performance, the market isn't there, nor is the durability, there were parts made, but they are long out of business usually (the manufacturers, that is) so you might find em, but they may be broken or expensive. So a 250 or 292 is the way to stay true to the 6 roots, and pack a punch!! I have two 235's that were given to me, and they'll run like a sewing machine, but anything beyond an engine to move a vehicle, they are not!! No hot rodding them unless you like pouring $$$ into a bottomless pit and like picking up random peices of scrap metal/engine parts off the pavement?!
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12-30-2008, 10:43 PM | #5 |
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Join Date: Feb 2007
Location: Austin, TX
Posts: 3,930
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Re: straight six performance
A turbocharger is great for the GM I6's because they are strong engines by nature. This is probably best for an experienced fabricator or welder but is worthy of mention being that this is a discussion about performance upgrades.
If you wanna look at some cool I6 stuff, look at the Nova's from Argentina. The 68-72 style Nova was sold over there throughout the 70's and I believe it only came with the I6 but some of them have been modified to be quite fast.
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1977 GMC Sierra Grande |
12-31-2008, 08:33 AM | #6 |
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Join Date: Nov 2008
Location: Ponder, Texas
Posts: 94
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Re: straight six performance
Try to google Glen Self [spelling]
It's been many years but he had a 10 second 68 camaro and used head fabed from 2 small black heads. I think he did a bunch of R&D for Clifford. That thing sounded like a herd of bumble bees. |
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