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Old 02-06-2011, 01:54 PM
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SBC 265 Build

Is there anybody out there that has built a 265 and whats the most HP i can get out of it. Me and my dad built it about 10 years ago and truck got stolen and they stripped the motor down. So all thats left is block and headers. Still has internals, it was borred out to a 350 i believe and has a mild cam. I would like to get atleast 350-400 hp, is this possible with this block or should i get a 350? I want it to be all motor as well, and it has a turbo 350 on it.

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Old 02-06-2011, 02:01 PM
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can't bore a 265 near that far, as far as horsepower youre going to be way better off building the 350.
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Old 02-06-2011, 02:02 PM
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Do you know an average hp that can be reached with the 265? I do like the high revs and the sound. Its sounds freakin awesome.
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Old 02-06-2011, 02:20 PM
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If you want to make some high rpm hp, why not find a pre 68 327 block using your 3" stroke crank and build a 302?
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Old 02-06-2011, 02:22 PM
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Just trying to research all possibilities, i will look into that for sure, im just trying to be convienient and stay with the 265 if i can get decent HP from it. If not then i will get another block.
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Old 02-06-2011, 02:34 PM
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There's a post over on JalopyJournal.Com in the HAMB section; just do a 265 search. Sounds like you'll be needing heads, and the early performance once are expensive and hard to find. You could use #601 305 heads with 53cc chambers. Same size valves, and a touch small chamber size for a CR boost. BUT, there's no substitute for cubic inches, and you can build a 350 way cheaper than a 265.
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Old 02-06-2011, 02:55 PM
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265

early 327 cu in 365 horse power at the rear wheels , put out over 450 hp at the fly wheel easy to build specs are in gm, and other manuals if you dont get oem parts its cheeper 265s are limited if you get 1 horse power per cu in. at the rear wheels . it would be better to start with a 302 ,327, or 350 and save your boreing $ and 265 numbers matching blocks are hard to find.You dont have to copy the 365 hp induction system a good single quad & mid range intake ,or tripower or dual quad induction should still get you over 350 horse at the rear wheels. Rule of thumb crate engs are fly wheel dynoed with no accessarys when installed in a vehicle subtract 1/3 of the horse power and that will get you realy close to what your rear wheel horse power will be. Example: 300 horse eng. flywheel dynoed will be 200 horse rear wheel dynoed. if you have air conditioning subtract another 8 persent! remember too ,early 350&365 horse power 327s used early cast exhaust !! you have headers, that will add a little horse power !! hope I helped ps: I only mentioned crate engs becouse there are some good deals out there like GM performace & paw to mention a couple theres no more zink in over the shelf oil if you run a flat tappet cam you need zink !!! lucas has an addative and stp has a lot of zink !! dont run diesle oil in a gas eng and off road oil will be to thick.
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Old 02-06-2011, 03:02 PM
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jr. stockers right on
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Old 02-06-2011, 03:17 PM
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heads

most cam co. have a copy of gms 30/30 solid cam .but youll need screw in rocker arm studs and guide plates [power pack heads {are plenifull here in michigan} most hot rodders have a set burried in their garages gathering dust next car show you go to tape a note on your back that your looking for them !! ods are someone will tap you on the shoulder!*******

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Old 02-06-2011, 03:25 PM
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I'm sorry, I just can't handle it.

I cannot imagine a bigger, slower TURD than a 265 w/a 30/30 camshaft. It's going to need a lot of CR, 4.56-plus rear gears, etc. just to be drivable, let alone fast or tractable.

Please, if you just have to build a 265, keep the camshaft mild, do the necessary research to see that using old, PP heads is NOT the solution to anything, and hopefully then you will just abandon the whole "265" thing for almost any other SBC engine.
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Old 02-06-2011, 03:31 PM
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The highest HP 327 was the '64-65 fuel injected, at 375 BHP, which was measured at the flywheel, without any driven auxiliaries, no water pump, trans, etc. The same years carbed model was 365 BHP, both produced 350 foot pounds of torque.

Not that they weren't a great motor, and a good choice for nostalgic car. The 265, 283 and 302's all shared the 3" stroke, the 302 used a 4" bore.

Back in the day they did wind 'em tight if they were built right! Like what's said above...it's old stuff.

You can run diesel oil, i.e. Rotella 15W40, in gas engines without problems, other than the cost. I've run it in Alaska in the winter, in my boat, motor home and use it in my prostreet blower car.

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Old 02-06-2011, 03:36 PM
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Even the correction factors were "looser" when the flywheel/no accessories/sans air filter, etc dyno numbers were generated- like the 327/365 HP engine, etc.

There WERE engines that were under-rated, HP-wise, due to racing class breaks and insurance reasons, but the high output 327's weren't among them.
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Old 02-06-2011, 03:52 PM
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You sure you even have a 265? GM has not produced one of those in over 50 years.

You would be way better off selling it to someone needing it for a restoration and use the money for something better to work with.
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Old 02-06-2011, 05:01 PM
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The best way to get 400hp out of a street friendly 265cid SBC is to supercharge it with a weiand 144 blower and 750cfm carb.

A home ported #416 305HO cylinder head is your friend for this one.

What is the piston in your 265cid motor? flat top, domed.
What is the bore size and stroke size now? 1956 was a long time ago.
You need to start by verifying what you got there to work with.
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Old 02-06-2011, 07:23 PM
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I built a stocker 265 for my 56 chevy. I upgraded the cam from the 205 hp factory rating(1-4bbl, pwr pac heads ) It sounds great with duals but thats it. It dont rev esp with the factory WCFB! Great cruiser motor.
The 302 is the way to go if you want to wind her up high!! Im in the process of building one now to almost factory spec....just gonna winder up a bit more higher with the 456s and the 4 spd!
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