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67chevelle396 02-14-2013 10:57 AM

396 rebuild
i am starting to rebuild 396 and i am wondering on how much horsepower i coud get out of the engine naturally aspirated and not nos or racing fuel

prumora1 02-14-2013 11:21 AM

what intake and heads, oval port or square port

Mr. P-Body 02-14-2013 11:46 AM

Your budget is the biggest limit. With aftermarlet heads and other components, 600 HP is "doable" on pump gas. Quite rowdy (lots of "cam"...).

500 is a "slam-dunk" with properly prepared oval ports ('68-'69 350 HP 396 or 390 HP 427) and good induction/exhaust and a roller. We have one "out there" in a '70 SS396 Camaro that runs low 11s with street "slicks". He CLAIMS 14 MPG, but that may be optimistic.

The key is a good combination. .


67chevelle396 02-14-2013 12:25 PM

well i just have block i wann b 600hp on pump gas

my brother thinks i will not get that but i hear 396 is a good motor and can hold up 02-14-2013 03:17 PM

600 hp on pump gas is not going to happen on any kind of reasonable budget.

67chevelle396 02-14-2013 06:37 PM

why do you say that 396 are good blocks and you can build the hell out of them i think its possible but my opinion 02-14-2013 07:02 PM

Been building/racing big blocks and engines in general, professionally since the sixties. Have a little experience with them.

396 engines are hard to build compression with modern heads. The older good heads are like hens teeth. Good performance pistons are hard to get/expensive. Many are listed in parts books but are no longer axailable. Most of the reasonably priced stuff is for the 4.250 bore engines. etc. etc. etc...

67chevelle396 02-14-2013 07:19 PM

i was just wondering on the horsepower ive been told many things ike its doable to get 600 and on the other note i wont even get 50 to the crank 02-14-2013 07:22 PM

The correct combo will get 450 reliable horsepower.

not cheap tho.

67chevelle396 02-14-2013 07:28 PM

im gonna build it new bottom end and new top end with dual four barrels i think i can c 500 but wht its going into doesnt need it

vinniekq2 02-14-2013 08:07 PM

Dual 4 bbls,good heads,roller cam,and about 15k in total will get 640 HP street able.What the above members are trying to tell you is either build a street friendly 396 because you want a 396 and look for a respectable 475 plus HP,maybe costing 7-8k

Or build a top drawer 396,solid roller,Al heads,custom pistons for 15k that makes 600HP and bolt on a twin carb tunnel ram for another 2k and get 640 HP
1.5 HP per cubic inch is a very strong street motor
a 600 hp single 4 bbl 496 stroker is cheaper and makes torque at a much lower RPM

your wallet?

67chevelle396 02-14-2013 08:14 PM

very well said and got a lot of ideas the motor has alot of potential

496CHEVY3100 02-14-2013 08:35 PM

3 Attachment(s)
Since you have a chevelle you might want to keep the 396 But if you choose one of these you will get More Horsepower Per Dollar with more cubic inches and more reliable also the more hp per cu in the more stress on parts,the first engine is a 66 /427 factory rated at 425 hp the second is a 496 tri power same block different stroke and compression, this 427 ahs solid roller 12.5 cr square port heads roller 850 quick fuel carb etc.etc. etc probably in high 550 or better at about 6800 rpm,the 496 is oval port alum trick flows ,hyd roller cam 10.1flat tops 3 holley 500 2 bbl carbs roller rockers .Very depandable High tourque,respectable hp probably 550 or better at about 5800 rpm .VERY Sreetable the 427 ir radical for street both make abiut same power but tge 427 has to turn much more RPM to do the same job which do you think will last longer with less parts breakage ,,Just my opimion im sure there are many more...also you can keep your valve covers a nd decals A Sleeper.:thumbup::thumbup:

67chevelle396 02-14-2013 08:56 PM

ty very much

Mr. P-Body 02-16-2013 10:01 AM

Vinnie nailed it. As I said, it's plenty "doable", just $$$. Hard to argue with virtually ANY BBC combination for a specific application when budget and parts are "right" with a good builder. And all the chatter about 496 is absolutely correct. GREAT street engine. But your block won't "fit"...

Since you have nothing but a bare block, you have a ton of choices. What was said about "shelf" pistons is correct. Hard to find for the "good" ones. "Custom" pistons have become far more popular and available in the last 10 years than they used to be (and less expensive form certain makers). With all the stroking and boring and rod length changes going on, "custom" engines are full of them. In another thread for a "torque" engine, I described a "428" BBC, using a 396 block and 454 crankshaft. EXTREMELY powerful for it's "size". It won't rev "quick" like a 427, but it will drag one backwards down the street. For a "pump gas street" application, a very good approach. This is particularly true in a heavier car.

With dual quads (properly set up, of course), modern heads and a good street roller, you have the makings of a SERIOUS BBC. I like it!


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