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post #1 of 23 (permalink) Old 06-26-2011, 01:31 PM Thread Starter
 
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1965 lemans

Original 326ci motor blew from previous owner... What should i replace it with???
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post #2 of 23 (permalink) Old 06-26-2011, 02:23 PM
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What are you looking for? Power, economy, or a little of both? If it were me, I'd build a low compression (9:1) 400 for it. I'm getting good power and excellent fuel economy from a low compression, moderately cammed 400 in my '67 GTO. Are you going to race the car, or just cruise it? Daily driver or weekend warrior?
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post #3 of 23 (permalink) Old 06-26-2011, 02:32 PM Thread Starter
 
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What fuel economy do you get with your setup???
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post #4 of 23 (permalink) Old 06-26-2011, 02:34 PM Thread Starter
 
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Both power and fuel economy are important to me...

Last edited by bear88; 06-26-2011 at 05:10 PM.
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post #5 of 23 (permalink) Old 06-26-2011, 03:57 PM
 
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LS7 twin turbo
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post #6 of 23 (permalink) Old 06-26-2011, 05:10 PM Thread Starter
 
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A LS7 twin turbo is a lil out of my price range...
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post #7 of 23 (permalink) Old 06-26-2011, 08:22 PM
 
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best bet is going to be a 400 like GeeTee said, it can go anywhere from mild stock build to stroked 462 500+ hp. blocks are readily available and the strongest of the bunch.
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post #8 of 23 (permalink) Old 06-27-2011, 12:21 AM
 
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Well you live in Vegas, or near it. You have 20 pumps in town that carry E85 which runs much cooler in the heat and makes lots of power, along with being cheaper than gas. Your engine will also last longer on it, and if you up the compression you can get pretty good mileage on it. I will find out how good you can do later this summer with my 70.

So I would build a stroked 400 or a 455 with ported/milled 72 cc heads, a mild cam that makes great power down low, stock intake, and send me a Qjet with a rebuild kit and I will convert it for you free of charge. You can build one of these cheap, make lots of power, and do pretty well on fuel and not ever have to worry about if you have good enough gas to make it run in the heat with anything over 8:1 compression. Just because it has between 11:1 and 14:1 doesnt mean you need a huge cam so it doesnt have to be incredibly thirsty. Man do they sound nice with lots of squeeze running on ethanol.
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post #9 of 23 (permalink) Old 06-27-2011, 07:58 AM
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with Thumpin'. If you know you're always going to be driving the car where you have E85 available, then the idea of building a high-compession "alcohol" motor has a lot going for it if you're after power. My personal favorite would be a 400 block stroked to 460+ because you get the benefits of the cubic inches without the drawbacks of the larger main journals/weaker main webs in the block. "Fuel economy" is a relative term when it comes to these cars, and I personally have no experience with alcohol motors - but Thumpin' does and is probably the best authority on them around here in terms of how to build one and what to expect. I've "heard" that alcohol has less "energy" in it per unit volume so it takes more of it to get the same power as gasoline, and that has an effect on fuel consumption when you're running at max power ---- but how it affects "normal" operation I haven't a clue.

Is that right, Thumpin?

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post #10 of 23 (permalink) Old 06-27-2011, 11:55 AM
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Bear88, my realatively heavy '67 GTO ragtop with TH400 (no overdrive or lockup converter) gets a little over 20mpg at a steady 70-75MPH. The secret is a light foot and the 2.56 gear I slipped into the back. With the low compression 87cc heads, it does not run as hard as it did back in the early '80's, when it was still wearing it's high compression heads, but it runs well. The secret these days with running lower, pump gas friendly engines is to install a modern grind camshaft (like the Comp Cams XE series) that fills the cylinders better and makes up for lost compression by superior flow. Recently did a low compression 389 for a friend, and his car runs as hard as the high compression race-gas job in my own '65 GTO. The alcohol thing may be an option, too. I have zero knowledge of alcohol motors, but there is no E-85 available here where I live. I could not have an E-85 car, because I like to drive them cross-country and need fuel that is available everywhere. Have driven the '67 to Yellowstone, Grand Canyon, etc. If you are going to stick to driving locally, an E-85 build may be the ticket. Again, it's up to you. Me, I'd build a low compression 400 with a comp cams XE262 cam and install a nice q-jet intake and q-jet and a good exhaust system. Cheap and effective. The most common rear gear in the '65 LeMans seems to be about a 2.78, so you'll be all set for good economy, combined with the tiny primaries the Q-jet has.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Projects, Barn Finds & Restoration Discussions

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