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Old 10th-February-2012, 06:22 PM   #1
Shauns BB70
 
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big block rpm?

my car has a 1970 396 (402) not sure if its a 4 bolt main or 2. My question is how many rpm can a stock 2 blot main big block handle. The guy who built the engine said the cam should make power to 6500 rpm. I shift at 5300 cause im not sure if the bottom end will handle 6500. I cant remember if he said it was a 4 bolt or two. I know its a cast crank. Also I have a steel crank from a 427. can I make this work in the 396? Thanks guys!
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Old 10th-February-2012, 06:35 PM   #2
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my car has a 1970 396 (402) not sure if its a 4 bolt main or 2. My question is how many rpm can a stock 2 blot main big block handle. The guy who built the engine said the cam should make power to 6500 rpm. I shift at 5300 cause im not sure if the bottom end will handle 6500. I cant remember if he said it was a 4 bolt or two. I know its a cast crank. Also I have a steel crank from a 427. can I make this work in the 396? Thanks guys!
396/427 strokes are the same. I have a "STOCK" 2 bolt block (454) that I have no problem twisting to 7200. There are many more important parts giving the ability to get there. A steel crank is a good idea. You may never need to wind it up to the redline, but the dyno will tell no lies (well, sometimes). That would be a good place to start anyway.
In short, yes it will go there. Many folks get the wrong idea about 4 bolts vs 2 bolts. If I happen to get a deal on one, great. If not, great. Machine work quality is key. What type of cam is it? I'm assuming it is hydraulic.
oh yeah, I'm pretty sure its not a fourbolt. That's not too common..
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Old 10th-February-2012, 07:04 PM   #3
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for a stock bbc 5,400 rpm would be the max I would go...if you want more ya gonna have to pay more... Crank, rods, push rods, etc... I would be glad to help but together a nice "Rat" !! Depends on your budget! but its soo easy to get power out of a BBC!!!
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Old 10th-February-2012, 07:55 PM   #4
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I twist my 402 2 bolt, cast crank to 7500 rpm!
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Old 10th-February-2012, 08:00 PM   #5
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If you have just stock but good condition parts and proper assembly, 6500 should be no problem at all. Valve springs would be my only reservation and if they are correct for the cam, you should be good to go.
I have done many, many BBCs and even 496 with stock two bolt mains have gone 7000+ with never any main or block issues. Not even mild supercharged.
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Old 10th-February-2012, 08:19 PM   #6
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If you have just stock but good condition parts and proper assembly, 6500 should be no problem at all. Valve springs would be my only reservation and if they are correct for the cam, you should be good to go.
I have done many, many BBCs and even 496 with stock two bolt mains have gone 7000+ with never any main or block issues. Not even mild supercharged.
^^X2^^ That's where I spent money knowing the bottom end was solid.
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Old 10th-February-2012, 08:32 PM   #7
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a 396, 427 ,,, 7500 used to be the standard rpm for 'em ,,lol ,,, a 2 bolt with a 4 speed i'd kinda worry about ,,, many many old write ups of tests with BBC's with 2 bolts going to 7500

one i remember the most was a stock 396 PHR mag built ,, they went stock everything , then they put a Lunati 268 @ .050 solid cam in it , a scorpion intake and a 850 and made 501 hp ,,, then they put a 125 NO2 kit on it ,, 2 bolt main ,, then they put a tunnel ram and 2 750 DPs on it ,,, winding it to 7500 ,, 538 gear in a Vega with 14 x 32 slicks ,, old school
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Old 10th-February-2012, 08:35 PM   #8
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I don't know guys 6500 and 7,500 rpms is kind of pushing it with those skinny stock push rods and stock everything...High rpms and sinking hp and tq, the dyno will show...
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Old 10th-February-2012, 08:37 PM   #9
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I twist my 402 2 bolt, cast crank to 7500 rpm!

Hey Paul,open your tach up and switch it to 8 cylinder.....








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Old 10th-February-2012, 08:41 PM   #10
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Hope you got a backup motor!! LOL these guys are pushing you!!! if you hear a loud pop!! call a tow truck!! LOL!!

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Old 10th-February-2012, 08:47 PM   #11
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I twist my 402 2 bolt, cast crank to 7500 rpm!
Wow! Really? Then I bet Grumpy hates that he did all that research and development on steel cranks!!
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Old 10th-February-2012, 09:07 PM   #12
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Hey Paul,open your tach up and switch it to 8 cylinder.....








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Come up, and you can reset it while I shift!!

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Wow! Really? Then I bet Grumpy hates that he did all that research and development on steel cranks!!
I knew an engine builder up here that was light years ahead of his time, he set an NHRA record in an Pontiac Astro. He used to do all my BB's and man did he know his stuff!
I love the look from passengers, when they see the tach at 7-7500 as I grab the next gear, it's like
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Old 10th-February-2012, 09:33 PM   #13
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Come up, and you can reset it while I shift!!:devil

That would be easy if your still trying to shift with that muncie shifter.... I'll fix your tach while your under the car getting the trans back out of gear


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Old 10th-February-2012, 09:37 PM   #14
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I love the look from passengers, when they see the tach at 7-7500 as I grab the next gear, it's like

You really need to fix that tach Paul....



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Old 10th-February-2012, 09:39 PM   #15
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That would be easy if your still trying to shift with that muncie shifter.... I'll fix your tach while your under the car getting the trans back out of gear


Tommy
The secret is I'm not racing when I'm shifting that high, so it don't have to power shift it. 2 ways to break a Muncie, hard launches and 7000+ rpm power shifts.

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You really need to fix that tach Paul....



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Nope, go big or go home!!
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Last edited by taz3; 10th-February-2012 at 09:46 PM.
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