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  #1 (permalink)  
Old 09-18-2007, 04:29 PM
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396

Hello,
First time on board here. Does anyone know any benifit in
using a forged 427 crank in my 396 block. What would happen
if I just used everything from the 396 rods, pistons etc... only
used a 427 crank??? I have a 1965 Malibu. I want to make a
SS out of it, it is not a SS right now. There was a factory option back
in 65 the "Z-16 Chevelle" very, very few. Plus on the 396 they made a
425 horse version. Which from what I understand is the solid lifter version
of the 375 horse 396.

Thank you,
Alan

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Old 09-18-2007, 04:33 PM
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no benefit from a 427 crank. same stroke.

a 454 crank will make it a 440.
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Old 09-18-2007, 04:36 PM
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If your 396 crank is cast and the 427 crank is forged, I think I would go with the forged crank. You will probably want to have the whole assembly balanced.
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Old 09-18-2007, 05:11 PM
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The 375 hp version of the 396 had solid lifters, square port heads, holley carb etc. It also had forged crank and pistons, good rods etc. It was a very underated engine that was actually more than 400 hp.

The 425 hp was a Covette option with a few more goodies..........

The hydraulic 396s had 325/350 hp...cast crank, pistons and poorer flowing heads.

Not all 427s had forged cranks, so check out what you are getting.
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  #5 (permalink)  
Old 09-18-2007, 05:43 PM
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More is better

what is the potention HP from a 396 with head work
good cam and close chamber heads vs open chamber
heads.
I like 396 cuz there is stout cyl walls and a beefy block.
Thoughts???

Thanks
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Old 09-18-2007, 09:08 PM
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The only substitute for cubic inches is rectangular dollars. IMHO, a 454 is just as stout as a 396 and 15% bigger. A 502/502 is even better, if I only had the $. Hence the reason I ran a 325 horse with a cast crank in my drag car.
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Old 09-19-2007, 07:40 AM
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If you have "flat" top pistons you will raise your compression ratio with closed chamber heads. You can check your head casting numbers here http://www.mortec.com/bbc.htm
Now the oval port head is not a "poorer" flowing head in fact it builds more velocity good for torq and there are countless articles on this. (Yes a larger cubic inch bbc chevy might find the ovals restrictive)
It is pretty hard to beat cubic inchs but if you already have the 396 vs going out to find a larger bbc it might be out of your budget.
Talk with a local engine builder that has in house dyno or a dyno shop and ask what they have seen for out put for engine combo ideas. Look here on some ideas http://www.camaros.net/racing/BBCombo.html
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Old 09-19-2007, 09:21 AM
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Bbc 396

Thank you for the replies. I have a chance to get a 427 4 bolt
block. Will the guts of the 396 work in a 427 except for crank
and pistons? Plus I cannot seem to cross the numbers on the 427
block. It is without doubt a 4 bolt (real stout) without the proper
measuring device to measure bore I used a tape and it is 4.125" to
4.25". i am concern though cuz back in the day Chev had a 366 big
block they ran in bigger trucks. I know 427 is old school and there are
maybe better out there like the 572 crate, but those are big $$ plus I am
old school and the 427 was the motor to have in my day. With rebuild
and mild cam a little compression these things by default are putting out
425 and usually more HP. Anyway just the sound of a 1965 2dr. Malibu,
427cu.in, M-20 or M-22, 12 bolt posi with 3.36's makes me smile.

Thanks
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Old 09-19-2007, 09:39 AM
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The 396 and the 427 have the same stroke 3.76". Used in 366,396,402,427. Again you can find info here http://www.mortec.com/cranks.htm
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Old 09-19-2007, 09:43 AM
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If you are going to a 4.25 bore block you could put a 4.25 stroke crank for more displacement (as stated before)if it is in your budget
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Old 09-19-2007, 10:03 AM
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BBC budget

I am not sure of a lot of things with regards to stroke
and matching stroke with bore, cranks etc.. I do not
want something that is rediculous to drive on the street,
but I also like putting new iron to shame when they feel
like running. I had that 67 GMC like I said 396 ended up being
punched 80 over and that thing would really surprise a lot of people
in a 4800-5000lb 4x.
Anyway off track..I always thought a 396 and 427 were the same block
just different bore...guess I was wrong. Not sure were to go from here.
I have 396 "69" vintage, have the chance to get 427 4 bolt (no crank) just
block & 4 bolt cap with bolts or a running 79 454 with 55K married to a T400
with 12K. The 396 I picked up for a $100 with a T400 been sitting for couple years. The 427 is $700 and the running 454 wT400 I have talked dwon to
$500. My 65 Malibu is in clean-up and resto state, the body is hanging off my
garage ceiling and just want to to any boxing in of frame for stoutness now
and need to know what I am going to run first. Then there is always the no frame work and run a 327, 375 horse which I have too (needs rebuilt) All these variables I suppose if it were someone else it would be esy for a decision...I like small block, but when your in a big block there is no comparing the sound, the in your seat torque.
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Old 09-20-2007, 01:49 PM
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I run a 396 (413 cid) or a 454 (468 cid) in my truck. They both use the same intake, carb, cam duration, compression, ignition, exhaust, transmission, and gear (same truck). And the the 454 makes noticeably more power and gets better mpg.

Smogger 454's are cheap. You can get a complete engine for less than 500. That is from carb to pan and flywheel to fan blades. Of course, it will need a rebuild but it is nice to get a complete engine to work with.

A little bump is cr and a little bump in cam duration and it will quickly become a torque monster with a decent amount of hp. Great for a heavy car, auto trans, and highway gears. A little more cr and a moderately size cam at it will lope and rev up nicely making it perfect for drag racing gears. 454's can become just about any engine you will ever need for your chevy depending of what cam and cr you put in it.
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Old 09-21-2007, 11:28 AM
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454

Morning Gents
Can anyone tell me what I have here it is a 454
#3999289 block casting with head#s 336781.
Came out of a 73 Suburban. Is the compression still up there
and is it a 4 bolt. Didn't the compression drop and catyletic converters
start in 74???

Thank you
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Old 09-21-2007, 12:06 PM
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Your block and head info can be found here http://www.mortec.com/bbc.htm
The "781" oval port head is a good start. One of chevy's better flowing open chamber iron oval port heads.
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Old 09-21-2007, 12:17 PM
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454 type

Says it could be 2 or 4 bolt 71-79
replacement blocks, "whatever that means"
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