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Old 08-30-2008, 01:41 PM
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454 question

1971 454 BBC 2 bolt main. if i bored it .80 over what would that make it? i know .60 over is a 468. any suggestions on what crank, cam, intake or heads i should use. what stall? will be a TH400 3:73 in the rear. its a 62 chevy pickup long bed. looking to make about 550hp or more and thump a little bit. but i still want to be able to get in it on a friday night and cruise through town. money is no problem...just means i have to take more time

Adam

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Old 08-30-2008, 02:07 PM
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You do not need to punch it out .080" over to make a big block make tons of power and torque. What is wrong with a 468, makes a great street engine. Most mild big blocks make an easy 500+, with great manners as well.

Jason
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Old 08-30-2008, 02:57 PM
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boring a block is for nothing more than a good compression seal, not making more power. you should stay as small of a cut in the bore on a reebuild as needed so you can rebuild it more in the future and less chance of distorting the cyl walls. want more ci, get a bigger stroke crank.
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Old 08-30-2008, 03:22 PM
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I dont think anyone makes a 0.080 oversize 454 piston,at least I've never seen one.
Guy
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Old 08-30-2008, 03:37 PM
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Adam, everybody here know what you're talking about, but let me help you a little with the figures.

.80 would be 8/10th of an inch, or eight hundred thousandths. You need to write this correctly. An eighty thousandths overbore would be written as 0.080". You would use a zero and decimal point in front to show that you mean less than one inch. An overbore of one hundred and twenty five thousandths would be written as 0.125" for instance.

I will have to disagree with TASHAN. Anytime you increase the bore or the stroke with all else being the same, you're gonna make more power.

I agree with 41Willys. You don't need to bore the block that big to make good power with a BBC and will probably get better ring seal with the thicker cylinder walls.

It makes me a little ill at ease with all you young fellows comin' on here and sayin' you need to make 500+ horsepower. You can't use that much hp on the street, particularly with a pickup truck that is light on the rear. Now, if you want to "back-half" the truck and make room for some serious rubber and serious suspension system, then ok, you can hook it up. The other thing is, to make "550 hp or more" as you said, you're going to need more static compression ratio and a pretty nasty cam. The nasty cam will require a very loose converter, which will be a pain in the ^^^ to drive on the street.

What you need is 9.0:1 c.r. and a reasonable matching cam that will make good torque throughout the operating range where you will normally be driving on the street, something like this.....
http://www.cranecams.com/?show=brows...tType=camshaft

Use a converter that stalls around 2,000 and enjoy the drive.
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Old 08-30-2008, 06:03 PM
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73 454

This may sound like a stupid question but sence were on this subject I have 73 454 that I may bore .030 over which seems to be the norm if you're going to bore one. Can I still rebuild it with everything else being stock. The pistons obviously will be a different size but I plan on just using it for show and daily driving. Besides puting new cam bearings in it and having cleaned what else should I consider if I want ti to get machined?

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Old 08-30-2008, 10:41 PM
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Quote:
Originally Posted by techinspector1
Adam, everybody here know what you're talking about, but let me help you a little with the figures.

.80 would be 8/10th of an inch, or eight hundred thousandths. You need to write this correctly. An eighty thousandths overbore would be written as 0.080". You would use a zero and decimal point in front to show that you mean less than one inch. An overbore of one hundred and twenty five thousandths would be written as 0.125" for instance.

I will have to disagree with TASHAN. Anytime you increase the bore or the stroke with all else being the same, you're gonna make more power.

I agree with 41Willys. You don't need to bore the block that big to make good power with a BBC and will probably get better ring seal with the thicker cylinder walls.

It makes me a little ill at ease with all you young fellows comin' on here and sayin' you need to make 500+ horsepower. You can't use that much hp on the street, particularly with a pickup truck that is light on the rear. Now, if you want to "back-half" the truck and make room for some serious rubber and serious suspension system, then ok, you can hook it up. The other thing is, to make "550 hp or more" as you said, you're going to need more static compression ratio and a pretty nasty cam. The nasty cam will require a very loose converter, which will be a pain in the ^^^ to drive on the street.

What you need is 9.0:1 c.r. and a reasonable matching cam that will make good torque throughout the operating range where you will normally be driving on the street, something like this.....
http://www.cranecams.com/?show=brows...tType=camshaft

Use a converter that stalls around 2,000 and enjoy the drive.
Ok, here is what I meant to say. Its not worth over punching a motor for (3hp for example) on an efficient motor 1cu should be about 1hp. Im not sayin a 7.4 will only make 454hp either. In general. Its not worth the small gain. Of course it will make more power, very little bit more. Not worth it to the average hot rodder joe I should say, if you have a team and race everyweekend, then maybe it would be. Personally Id like the have the extra meat on the walls in a driver.
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Old 08-30-2008, 10:59 PM
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Thanks for the clarification. I agree with you.
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Old 08-31-2008, 10:28 AM
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ii understand about over boreing it. i have every nut and bolt and tab off this truck right now. narrowing the rear end is an idea i have been tossing around that is very likely to happen. it started out as a project to put around and do a good burnout every now and then. but i see more and more of these era trucks around and its getting to the point where im not impressed and dont want the same thing everyone else has....but now i just slowed the process down by buying a very clean 66 corvair haha for 500 bucks that i have no plans for except hiding it in the barn. i will admit i did think boring it made a little more horsepower than 3.

thanks
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Old 08-31-2008, 11:25 AM
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What happens when you need to bore out that 0.080" overbored block?
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Old 08-31-2008, 12:43 PM
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BMM you sleeve it! and If I was to bore out a stocker 454 to that dimention I would do the sleeves right off and make them wet liners so that there is no question as to the integrity of the wall because 0.08" over is getting into the "oh I got lucky and got a cleen cut out to..."
While theoreticaly you should have the meat the factory core shifts when they poor the molten iron in so you will probably be SOL for the factory cyl walls. Dispair not wet liners are better!

As for power My 500 hp C30 does not impress me unless I hammer down while already going 60 in 4th then bull charge! 454 0.03" over 10.2-1 compression and a 230 deg duration cam @0.05 lift 0.51" lift with 111deg lobe seperation.
780cfm carb, HEI all MSD and Edlbrock Performed dual plain intake. Runns good but I want more!

BLOWN DIESEL!!
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