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Old 06-02-2010, 10:04 PM
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swapping straight six with 326

I am currently in the process of pulling the original straight six OHC out of my 66 lemans and putting a 326 instead. i have the old motor out and the new one bolted to the powerglide transmission, the problem is with the motor mounts, they do not match up. i have purchased motor mounts off ebay but the engine seems to set about 2 inches to far back and the mounts are still too narrow to allow the engine to drop in all the way even with the new mounts. i am now to the point of either welding the mounts on the cross member a little higher up or hopefully finding some different mounts to do it properly. any help would be greatly appreciated. thanks

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Old 06-03-2010, 11:37 AM
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Step away from the welder!

The 326 was factory installed in these cars, so obviously it should be a bolt-in with the right parts. Either you have the wrong frame mounts, wrong motor mounts, wrong trans crossmember location, or some combination of the above. By the way, I suspect that trans is a Super Turbine 300, not a Powerglide.
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Old 06-11-2010, 10:50 PM
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looking for a frame

well, my quick engine swap took a turn down the frame off restoration road after an inspection from a mechanic. the body has been lifted off the chassis and after more inspection i am looking into a new frame. the new built rolling chassis interest me except for the 10k price tag. if anyone has sites to check into or any info it would sure be appreciated on which direction to go from here.
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Old 06-12-2010, 06:31 PM
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Pontiac, Oldsmobile, Buick---Lemans,Skylark, Cutlass,
Same frame
Not sure, but I think the ElCamino/Wagon uses that same frame 64-66 (67 uses different rear spring mounts)

A Chevelle frame will work if you want to extend the frame rails between the last 2 body mounts on each side. (chevelle is shorter between the rear bumper and rear wheels)

At any rate---64-66 GM A body cars use essentially the same frame, with minor modifications. The only major modifications that MAY need to be done is extending the rear rails by about 3"
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Old 06-13-2010, 12:10 PM
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While you're at it, consider keeping the OHC six. It's waaaay cooler than a 326. Sprint manifolds with the Qjet intake and split exhaust are available. There was a set for sale at Spring Carlisle this year.
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Old 06-13-2010, 12:56 PM
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Quote:
Originally Posted by joe_padavano
While you're at it, consider keeping the OHC six. It's waaaay cooler than a 326. Sprint manifolds with the Qjet intake and split exhaust are available. There was a set for sale at Spring Carlisle this year.
I've got to agree with keeping the OHC six, much cooler and a lot more rare than a garden variety 326.

At least save every OHC specific piece in the back of the garage, in the future you may be glad you did.
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Old 06-14-2010, 12:45 PM
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My '68 Le Mans began life w/a 250 CID Sprint, equipped w/the Q-jet, 1.94" intake X 1.6" exhaust valves, higher compression (IIRC 10.5:1?), split exhaust manifold and big cam, etc.- all from Pontiac. Also like the Pontiac V8, my 6-cylinder's combustion chambers were machined (I had the head off early on to do a 3-angle valve job and to port the pockets).

Made 215 HP, ran like a decent 283. In fact, was a good deal quicker than a buddy's '63 Corvette w/a 195 HP 283 w/3-speed and a 2-bbl.(I had the HD 3-speed w/OEM Hurst shifter). Even w/hydraulically controlled cam followers, it would rev to 6500 RPM w/ease (had dual valve springs), but didn't make any power up there, so I shifted around 6K- and that was probably too high.

Thankfully, my Le Mans had a Sprint stripe delete, so it looked more like a GTO than a Sprint- except for the chrome bumper (which could be had on the GTO, BTW).

It was a fun ride, but I bought the '68 Le Mans for a stick shift platform to run a 428 Pontiac w/Tri-Power I had built and ran originally in a '65 Chevy short bed Fleetside PU w/the engine set back 18" and a La Salle 3-speed. Turned out the Le Mans' 6 cylinder bell house is different (this I didn't know) along w/the Z-bar (which I DID know).

The biggest "problem" w/those OHC engines, were they all leaked oil from the front accessory drive set-up. There was a couple 'tricks' to adjusting the cam belt (required the entire accessory drive to be moved sideways) that would prevent the gasket from getting mauled, so if this was done, it would stay relatively leak-free.

If I remember right, the 326 had 250 HP, w/the Buick's ST 300 2-speed AT, the 326 would have an advantage in torque, but in handling, the Sprint would be better.

Last edited by cobalt327; 06-14-2010 at 12:50 PM.
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