262 to 308?
Hi all,
After 99K miles and 2 valve jobs I think the original engine in my ’49 Super Six is about ready for a rebuild. I suspect I’ll be doing a major re-bore (the guy who did the last valve job noticed a pretty good ridge at the top of the cyls) which means I’ll be buying a new set of pistons. Is it practical and safe to bore out a 262 to 308 std. specs? I understand that the 308 crank will fit right in. Any thoughts appreciated!
Best,
John
After 99K miles and 2 valve jobs I think the original engine in my ’49 Super Six is about ready for a rebuild. I suspect I’ll be doing a major re-bore (the guy who did the last valve job noticed a pretty good ridge at the top of the cyls) which means I’ll be buying a new set of pistons. Is it practical and safe to bore out a 262 to 308 std. specs? I understand that the 308 crank will fit right in. Any thoughts appreciated!
Best,
John
0
Comments
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John, remember that the 308 crank came from a wider engine {Assuming your 262 is an origional 49 model}. This engine had greater cooling capacities than earlier Hudson stepdown blocks.0
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You will need a 1952 or later block to mix n match. I've seen 232 cranks in 308s which gives you about 255 cubes (If I remember right :rolleyes: )but the capability to have more rpms safely. Hope this helps a Packard guy, they can be a beast of their own too!0
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However, the crank should fit and clear everything. You don't have to bore the thing all the way to 3.8125. Just bore it to clean it up.
Stan Lupka won a lot of dirt track races and was track champ etc with a 262 carrying a 4.5 in crank and bored to 299.5 inches to get under the track-imposed 300 in. limit, designed to get rid of the hot Hornet motor. The 8 inches with Twin H wasn't even noticable, and he cleaned the track up for years with it.
Personally, I'd stick with the overbored 262, and put Twin-H on it, since the balance is better and the extra torque from the longer crank and the increased HP for street use is not that much.0 -
Thanks all. I'll prolly stay with the original crank and just go with whatever overbore is required to clean up the cyls. I'd love to find a Twin H setup....what do they typically sell for?
Best,
John0 -
The 262 definitely won't bore out to 308 size, you will break through to the water jacket well before you get to that size. The blocks were extensively re-worked to accommodate the 3-13/16" bore size.
Geoff.0 -
Complete Twin H units without aircleaners go in the neighborhood of $300 on EBay. Add another $100-150 for a decent set of cleaners.0
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backtohudsons wrote:Complete Twin H units without aircleaners go in the neighborhood of $300 on EBay. Add another $100-150 for a decent set of cleaners.
Thanks, I'll start looking. Sure beats the $2500-$3500 I've seen for 1955-56 Packard Caribbean 2X4 set-ups!!!
Best,
John0 -
I am running a Hornet twin H on my 49 262. Standard with OD. Runs great..cruised the interstate at 70 MPH. Gets 15 MPG. Does OK in traffic in town.Probably about the same in gas mileage in town too.. I am going to put a double action fuel pump on because the vacuum is not high enough to lock the cruise control at 70. Drops back to 65 every time! It takes a lot of pull to open those twin carbs!I tried softer return springs, but it made the gas pedal "touchy".
Dave W. Fl0 -
watch for cracked manifolds. It seems the exhaust manifolds are real prone to cracking around the central 4 bolt area. Worse case scenario, if you get one that is cracked, you can, of course use the lower manifold off of your 262 single 2 barrel with some modification. Linkage is probably the toughest item, the part that bolts directly to the motor is the most difficult. I looked for several months before getting that one piece. Aircleaners come around often enough. Best bet is to buy a complete set-up and pay the extra money for a complete nice set-up.0
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