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  #16 (permalink)  
Old 12-03-2013, 01:30 PM
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Quote:
Originally Posted by ap72 View Post
This is probably a bit big for your application but I have a new PRC-108 cam that I'm not going to use with a set of direct lube Howards lifters that I'd sell you at a big discount.
specs:
108 248 251 .531 .542 106 279 282
I installed it in a short block on the engine stand so it has lube on it but I never even put the lifters in the block, it'd be good with a larger converter, and the lifters are supposed to be some of the best street solid tappet lifters out there.
The motor will need 10.5:1 to 12.0:1 static compression ratio to support this cam and with a intensity of only 31 degrees, It's workin' the lobes and lifter crowns pretty hard. Operating range- ~3200 to 7000 rpms.

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Old 12-03-2013, 01:38 PM
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T.I. Thoughts on a "typical" 400 SB with those heads and something like a 268 or 270 MFT? I suggested that due to not knowing his SCR, DCR, converter and rear. The 270 will be alright with a stock or near stock converter USUALLY; however, its far from ideal. If it was me, Id build the 400 with a milder cam and build for max mid range and torque for a street car. I wouldn't want to rev a 400SB with an unknown bottom end much over 5500 personally
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Old 12-03-2013, 01:55 PM
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Quote:
Originally Posted by techinspector1 View Post
The motor will need 10.5:1 to 12.0:1 static compression ratio to support this cam and with a intensity of only 31 degrees, It's workin' the lobes and lifter crowns pretty hard. Operating range- ~3200 to 7000 rpms.
intensity measured from where?

It's a solid cam, .016" lash

Typically peaks around 6000-6500 on a properly matched 350, so likely around 6000 in a properly matched 400.

Used a lot on 9:1 350 budget racing deals.

Those were the reasons I bought it, but that engine is starting to collect dust now that I'm building this LT1 so I may as well part it out.
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Old 12-03-2013, 02:21 PM
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Quote:
Originally Posted by AutoGear View Post
T.I. Thoughts on a "typical" 400 SB with those heads and something like a 268 or 270 MFT? I suggested that due to not knowing his SCR, DCR, converter and rear. The 270 will be alright with a stock or near stock converter USUALLY; however, its far from ideal. If it was me, Id build the 400 with a milder cam and build for max mid range and torque for a street car. I wouldn't want to rev a 400SB with an unknown bottom end much over 5500 personally
Your thoughts align with mine.

What we are seeing on this and other forums is a continuation of the oft-quoted hot rodder's axiom "If some is good, more is better and too much is just right".

It's human nature to push the envelope and for those who have never built a motor, it's easy to use too much cam and too much static compression ratio in a street motor. The average newbie thinks he wants a 450 or 500 horsepower motor because that's what he's reading in Hot Rod magazine. These mags don't build 300 or 350 horsepower motors because that would not sell magazines. Truth be known, that's what the newbie needs, 9.0:1 static compression ratio, a 268/270 cam and a set of L31 heads.

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  #20 (permalink)  
Old 12-03-2013, 08:44 PM
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consider an Isky Z-20 or 25.you must match all the components to have a decent package.
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Old 12-04-2013, 12:35 PM
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im not sure what the compression would be, the stock pistons are dished, and i think my pistons are like .060 in the hole which i guess is how 400's are plus your the average .040 head gasket so thats .100 plus whatever the cc of the dish plus 64cc chamber is probly high 8s i assume. a local engine guru i talk to here and there said a comp xe 274 or lunati voodoo 276 (my decision but he supports comp) would make me more than happy, car is a junk 82 camaro with a 3.42 10 bolt, stock trans i think its a turbo 200? 3speed, stock converter, im not puting money into the car, eventually it will go to scrap and the engine will go into either a 73-87 4x4 or k5, or a 88-98 ext cab z71 carbed engine project.
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Old 12-04-2013, 03:23 PM
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If your current pistons are .060 in the bore now,somebody has put the wrong piston in.
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Old 12-04-2013, 07:42 PM
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If you are just guessing and the car is getting junked,dont bother changing the cam.
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Old 12-04-2013, 07:50 PM
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If your "engine guru" told you to put a Comp 274 in a car with factory dished pistons, enormous heads, and a block that's not zero-decked; nevermind you don't have enough rear gear OR converter...I HIGHLY suggest you A. Get a new guru, and B. Buy a book and become an informed consumer. I'd also suggest he's trying to sell you on an engine that's more sizzle than steak; in essence, hoping the more obnoxious and annoying it is to drive, the more you'll think its a hot rod, brag about your bottom of the page camshaft, and how much of a Zen master he is. You'll be leaving a lot on the table. Dont take my word for it, I'm an idiot compared to some of the fellas here, but I know you don't have the compression, the converter or the rear gear to make that work. Look on the comp cams page, a 270 Magnum cam needs a deeper rear gear and probably a little more converter than stock and its RPMs are I think 1500-5500 or so. I'm not a fan of the 268 cams, personally they seem to under perform in a lot of cases. You could put a 262 solid lifter cam in there, with a pair of Vortec heads on top and out perform the racy 274 and 276 cams with your combo as it sits currently. What you have is a stock shortblock, you shouldn't wind it to the moon, but you can make a SERIOUS stump pulling, bare knuckled brawler. Sure it won't idle like a Harley, but it'll pull like a freight train to 5grand, and be happy with an over drive and 3.42s. You may want to look at drilling whatever heads you use for steam holes.
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Old 12-04-2013, 08:58 PM
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I think autogear nailed it,,,,
not all gurus are gurus
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Old 12-04-2013, 09:09 PM
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the heads already have steam holes, and no ones selling me an engine, I have it, the cam that's in it I picked out, I thought it was going to be a healthy cam for a mild engine that wasn't gona be over kill and sound awesome which the 274h06 is known for, but...... this would be true if it was on a 350 which all cam descriptions and suggested specs are based on. on a 400 this is not the case, the engine sounds near stock. I have 15% more engine, which plays a factor, didn't know that at the time, so on a 350 with good heads an xe 268 is very popular and the xe 274 is seen as too big, when you add 50ci the scenario is going to change. if I need different pistons no big deal. im not starting anything till after winters over so I have time.
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Old 12-04-2013, 09:20 PM
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when you go through the engine,you will have time to make it correct. Match the parts and make some power,,,
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  #28 (permalink)  
Old 12-04-2013, 09:34 PM
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The heads factor in BIG TIME in your simple view of cam duration.

On a stock or near stock port size the 268 is about all you want regardless of displacement. If you want more then you should have a bigger head too, and more compression.

I'm really surprised the 274h06 sounds near stock in your 400, it's not close to stock. What is your exhaust set up? I'd try it with the heads you bought and 1.6 rockers before you swap it. You'd only be out a couple gaskets by waiting.
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Old 12-05-2013, 12:32 AM
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your new heads seem big for your set up. they're good heads though, like a factory ported Sportsman II (which really isn't that bad) but newer and improved. there are worse heads out there, but your combo is a little mismatched. your static compression sounds low. stock pistons for a 400 are somewhere around 20-24cc dish I believe. with an optimum deck height, proper combustion chamber, and "ideal" head gasket thickness you're looking at 8.8-9:1. not really the best with your cam choice. there are some thinner head gaskets available for stock bore 400's, some MLS types for larger bores, you could bump your compression up with that if you keep your 270's cam.
the heads and cam really dictate what you should do with the engine. big heads, big cam, moves the power higher up. big heads, small cam, works for some but still moves the powerband up. if you're not driving your setup for very long or your not racing it or you're not changing the compression and gears, I'd just run that ***** till youre done with it and call it good. I wouldn't waste more time thinking about it. keep the cam, swap the springs and run it. who cares what it does? it'll run down the road and do all the stop light to stop light crap, it just wont perform like it's well thought out.
if you're keeping that 400 and those heads, I'd match them up with a 10:1 scr or better and build the engine for a little higher rpm range. if you think it all through it'll perform really well. it'll probably drive like **** around town, but it'll perform.
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Old 12-05-2013, 08:20 AM
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from everything i looked at most piston companies rate a factory equivalent dished piston size and a 64cc head to be just under 9.5:1, which is perfect street compression, flat tops i think were 10.6:1. gm rated the 400 at 8.5:1 with 76cc heads, if needed i can modify a .020 steel head gasket to work on a 400
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