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Old 04-14-2012, 09:07 PM   #1
racingdragracer
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Default help me bbc 396 build

I have a 4th gen camaro and I want to run 6.60's to 6.80's

I have a 396 bbc i am trying to put together and install in this car.

It will be 3300# and has a 1.76 glide with pro brake.

Thinking about going with a 4.88 gear. Has 275 drag radials

The motor is a .040 396 shortblock.

It has closed chamber speed pro pistons.

I need good budget aluminum heads and a solid roller cam.

Just don't know what will work.

Been looking at the Brodix race rites

Thanks for the Help.
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Old 04-14-2012, 09:26 PM   #2
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Default Re: help me bbc 396 build

I've heard from many a builder: a 396"bbc is the toughest to build. I'm guessing due to the dome it takes to get a good compression ratio and piston to valve clearence.
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Old 04-14-2012, 09:34 PM   #3
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Default Re: help me bbc 396 build

I have a buddy with one running decent but i need to run a little quicker. He is at 3650# and runs 7.20's with a th400 and a 4.11 gear.

His motor is
408
9.5 comp.
Factory iron ported heads with 2.19 1.88
850 aed with a 454-o
110ls
.246int. .254 exh crane roller
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Old 04-14-2012, 09:57 PM   #4
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Default Re: help me bbc 396 build

His car definitely needs a three speed, and in my op so do you, 3300 isn't necessary light. My car weighs 3170 w/me in a third gen, so your car with a bbc weighs less or the same as mine (both rolling). Your car is gonna struggle in the 60' with a p/g, and you need all the advantage you can get over your buddy, and the first 60' will determine who's quicker, unless you grossly overpower his mill the rest of the .way, if you haven't already invest in a good torque arm(dropped my 60' .10 sec alone) lower control arms, I was doin 1.53 60's with these and edelbrock non adjustable torque arm and flashing the torque converter and on stock 25 yr old springs and shocks.
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Old 04-15-2012, 12:06 AM   #5
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Default Re: help me bbc 396 build

just my 2 cents i would run compression at about 10.3 or so if u are going to use a aluminum head.the brodix race rite is a good choice for a budget head.for sure run a th400 trans and about a 4.10 gear or so depending on tire size.i would have a cam picked out just for your combo.converter is key to.u can get some good rpm with that 396.my fried had a combo close to what u are thinking and it went 11.3s or so in a 67 camaro at 6000+da.think the build through and it will work fine.there are alot of people on here that know more then me but it gives u a good idea.
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Old 04-15-2012, 12:19 AM   #6
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Default Re: help me bbc 396 build

Race Rite Ovals Or Dart Ovals and Last but not Least World Products Ovals (IRON)
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Old 04-15-2012, 12:46 AM   #7
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Default Re: help me bbc 396 build

go to a
a four inch or a

four and a quarter inch stroke...


what actual casting number of the 396 block....??

the original 396 was 4.090" boresize
many 396 blocks are not good to go to a larger bore..
due to this small diameter boresize,
you should stay with
small chamber standard valve guide spacing...
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Old 04-15-2012, 05:32 AM   #8
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Default Re: help me bbc 396 build

I will have to check on block casting. The car has been run before. It has a s&w torque arm, edelbrock lower control arms. Pa racing complete front end and strange shocks all around.
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Old 04-15-2012, 10:43 AM   #9
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Default Re: help me bbc 396 build

It can be done with a stock iron head and a good solid flat tappet. If you are set on aluminum heads stay with an oval port,AFR has a 265 that looks to be good,they also have a 290 oval but it is CNC ported.
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Old 04-15-2012, 11:04 AM   #10
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Default Re: help me bbc 396 build

I want the aluminum for weight savings and room to grow.
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Old 04-15-2012, 11:24 AM   #11
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Default Re: help me bbc 396 build

the 396 is a good engine..with some decent oval port castings it can make the hp you require..if its 1/8 mile only, i'd run a 4.56 or 4.88 gear, maybe even a 5.13..as stated earlier, just a good flat tappet will do the job..a roller will help..

the early blocks are normally quite thick, and some can go to 427 inches..

at 402 inches, you have a heavyweight canted valve small block with big heads..think that way..
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Old 04-15-2012, 12:22 PM   #12
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Default Re: help me bbc 396 build

Quote:
Originally Posted by racingdragracer View Post
I have a 4th gen camaro and I want to run 6.60's to 6.80's

I have a 396 bbc i am trying to put together and install in this car.

It will be 3300# and has a 1.76 glide with pro brake.

Thinking about going with a 4.88 gear. Has 275 drag radials

The motor is a .040 396 shortblock.

It has closed chamber speed pro pistons.

I need good budget aluminum heads and a solid roller cam.

Just don't know what will work.

Been looking at the Brodix race rites

Thanks for the Help.
-) Pump gas or strictly race fuel ?

-) If you plan to run the pistons you have, when you order the heads, check the box for their reduced chamber option to help boost the compression. To get these small cube BBC's to run well, they really need compression.

-) For the heads, AFR and Brodix make nice stuff. But good and budget are seldom found together. I wouldn't go any bigger than a 290CC intake port. If you went with a 290 port head, you would need to spin it higher but that would depend on the lower end. Those Speed Pro pistons are heavy. A good steel crank, stock rods are fine w/ beam polish and shot peening, but need to replace the rod bolts w/ a set of ARP's. Balanced with good SFI approved balancer.

-) For an intake, the Edelbrock 454-O .... or it you have no desire to spin it past 6500, go with Edelbrock's Air Gap RPM for oval port head.

-) You need a three speed trans. A well built 350 turbo will live behind it and the right conv will make it all work.

-) If only 1/8 mile racing, the 4.88 or 5.13 as previously mentioned. The 5.13 would be my first choice.

-) The rear is going to need a good quality set of double adjustable shocks to make those drag radials work. And a good set up front too to help with weight transfer.

-) Do you know what year of block you have? The '65 blocks and the early '66 blocks had thick cyl walls that allow them to go to a 4.25 bore ...as mentioned. But with any block ... sonic check is a must.

-) If you happen to have a '65 block, be mindful of the rear cam bearing in the block. It is grooved and requires a special bearing. I want to say that some of the real early '66 blocks came this way too but I'm just not 100% on that.

-) You mentioned about having room to grow ... I'm thinking cubes. That 290cc port head will support a 505 ci engine with a little work. .... FYI

Hope this helps a little.
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Last edited by Horndog; 04-15-2012 at 12:24 PM.
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Old 04-15-2012, 12:34 PM   #13
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Default Re: help me bbc 396 build

once again,

what is the casting number on the block....?
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Old 04-15-2012, 12:54 PM   #14
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Default Re: help me bbc 396 build

If you put open chamber heads on closed chamber pistons you will wonder why it is such a slug. I would use a set of iron closed chamber heads with 2.19 and 1.88 valves and a good bowl job. 65-67 small port iron heads will do just fine. Either that or do like Jon Kaase did to win the Engine Masters several years ago and weld up the chambers in aluminum heads to replace the quench on the sparkplug side.
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Old 04-15-2012, 01:39 PM   #15
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Default Re: help me bbc 396 build

not all or every 396 can be made into a larger bore..
some are thin

some are thick

but still,
common is at 4.125" max...if you are lucky..

as said by others, this is the problem with the large chamber heads..along with the valve spacing being wider and larger valves not clearing the relative small / narrow 4.125" boresize...
...once in a while one can go to 4.310"...
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