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  #16 (permalink)  
Old 10-19-2012, 02:28 PM
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Quote:
Originally Posted by Bogger View Post
Its weird down here with e85. There is a place a fuew miles from me but then its almost 60 miles till next one. Plus it will be to far between filling and I dont want to absorb water in which ethenol is known for. And the bad humidity we have. Plus ill be doors deep if I go threw the rivers down here and any moisture isnt good.
Yep nobody near me has chit! I am lucky to drive 3 miles for sunco 94. Or race gas 10 miles down the road at crazy price. I live in MD near DC. I hear e85 is availible in a lot of areas but only a very few near dc. Its even hard to get propane for a car. Meth is no problem used to get that right down the street for 3 bucks a gallon. Put thats a world of problems.

I have not had any expertise running E85 in mud so i will not comment further than to say its not nearly as bad as straight eth or meth. Its very forgiving because of additives they use. But we all know that changes from summer to winter in the northern states. Our gas in winter is 5% eth out of the pump. Its a goverment reg in northern states.
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Old 10-19-2012, 02:29 PM
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I've built and dynoed a motor with those heads for a magazine engine build (see rat rod magazine #7 i believe) for their tour car in 2011.
used dished pistons and kept the compression way down for the lousy gas they find on tour. tested on 87 octane, we didn't pull big hp numbers but torque was 360. this was with a mild hydro cam, stock replacement style pistons with thick rings. stock valve sizes, and only a port match to clean up a messy pushrod area. even had a mismatched old edelbrock scorpion intake for that old school look.
keep the duration mild, these heads drop like a stone after 4500 rpms but used in this situation they have their merits.

currently building a 383 with these same heads for a nice 90's pickup used for towing. i have no doubt we'll go over 425 ft. lbs. on pump gas and a stock computer
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Old 10-19-2012, 09:21 PM
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@hcomptin. We use up to 15% eth in all of our gas. Since they did that 3 years ago ive put a lot of fuel pumps in vehicles.
When it comes to intakes. I can use any I havent bought any yet. I will be carborating this engin. Had to many electrical issues with this truck. Also something to remember is this is a heavy vehicle. I weighs 6600 lbs. That is the main reason for the torque. We have a lot of hills and I want to be abble to drive up them without having to slow to 30 mph and I have no intention to go any higher than 5, 000 rpm. This block is not capable of hitting high rpm with it being 2bolt main and 268 block casting. I am just hoping to find what the max lift with new springs is for theese heads and what would be a good cam for my combination. I will most likely be removing the veins in theese heads.
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Old 10-19-2012, 11:24 PM
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Old bogie. What about 882 heads. With my large dome piston I will fill the 72 cc heads well and drop my compression a bit.
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  #20 (permalink)  
Old 10-20-2012, 08:47 AM
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Quote:
Originally Posted by Bogger View Post
@hcomptin. We use up to 15% eth in all of our gas. Since they did that 3 years ago ive put a lot of fuel pumps in vehicles.
When it comes to intakes. I can use any I havent bought any yet. I will be carborating this engin. Had to many electrical issues with this truck. Also something to remember is this is a heavy vehicle. I weighs 6600 lbs. That is the main reason for the torque. We have a lot of hills and I want to be abble to drive up them without having to slow to 30 mph and I have no intention to go any higher than 5, 000 rpm. This block is not capable of hitting high rpm with it being 2bolt main and 268 block casting. I am just hoping to find what the max lift with new springs is for theese heads and what would be a good cam for my combination. I will most likely be removing the veins in theese heads.
Not sure about the 268 block but usally the rod bolts let go first everything else can spin to 6000 without much issue. 2 bolt mains are fine dont have any sleepless nights over them. Its very rare for them to fail below 500 hp. The stress on the mains is greater when the engine makes mad power.

At 5000 rpm max you are looking toward a stock style cam. Its not going to make any power. The wieght does not matter its all about the gearing in big trucks. Think of it this way an 18 wheeler has tons of low rpm power. But if you have ever been behind one on a hill you know they cant hold the speed going up big hills. But hill climb trucks have dragster engines they got up the hill with the front tires in the air throwing dirt the entire time.

Im just saying if you shoot for 6k rpm max you will have a lot more punch. Look at xe comp cams they are made to have a wide power band. I would not go crazy but a little rip will not hurt at all. Avoid the thumpr cams they are not what you need. Also you problaly wont see any lope with either cam. New cams run a lot smoother in the smaller grinds. Checking your dcr will help alot with your cam selection. As you can balance torque with cr and max your combo. Maybe someone else can explain how dcr works and how to use it to pick a cam.
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Old 10-20-2012, 08:56 AM
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if its built with a cam to make power at 6000, its going to be a complete slug. just as the cam is coming on, the heads are giving up and it won't make power anywhere.
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  #22 (permalink)  
Old 10-20-2012, 09:25 AM
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Originally Posted by Plaintoast View Post
if its built with a cam to make power at 6000, its going to be a complete slug. just as the cam is coming on, the heads are giving up and it won't make power anywhere.
I ment a cam that is all done at 6K rpm. With dual pattern cam for wider powerband should hit good.

Not max power at 6k that would be a much bigger cam with a 7 to 7500 red line. Max power around 5 and still making power at 5500.

A cam with an advertised power band of 2K to 5K will be all played out by 6k.
If you get a cam that does not rev over 5k its going to be whimpy with power falling off at 4500.

HP vs Torque the age old question. The truck is 6000+ lbs if you want it to move you will need enough power to move 6000+ lbs. high or low rpm power band all that can be worked out with proper gearing. If its down on power it will never get up and move. no matter what the gear or how much torque is available. HP is work being performed torque is twisting force of a static object.

Look at it another way. look at dyno results from real engines if you have 1000ft lbs of torque how much hp is that same engine making. If you want the kind of torque your talking about you will need to shift the power band up a few thousand rpm. only bigger displacement or boost can change that.
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Old 10-20-2012, 10:12 AM
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Horse power will be my by product. Torque is what I need in this combo. Horse power is a result of rpm and torque. If I keep a lower rpm I cam make more torque. Now im saying I wont be reving much over 5 even when it was stock I reved it to 6500 rpm and hit 8ooo once. I got csared, blew my trans. Im not planing on going much over 5 but It probably will. Im trying to get gobs of torque at a reasonable price and make it reliable and sound good.
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Old 10-20-2012, 05:43 PM
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the 882 heads are not your friend if you want power or torque.
About the worst head chevy made. Just look at the OEM power and torque rating of the engines that used these
heads stock. Thats a good clue. This is a restrictive low perf head. No power no torque compared to other SBC heads. Bad ports bad combustion chamber.
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Old 10-20-2012, 06:34 PM
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I have seen these heads on ebay. These would be great for your purpose. At 600 a set ready to bolt on its hard to beat. Not sure of the quality but 185 runners would make some good power. Wouldnt go for the 210 since you want more torque.

Pump gas and good torque/hp
327 350 Chevy Aluminum Cylinder Heads 2 05 Angled Plug 185cc Intake 600 Springs | eBay

I understand not wanting to spend the cash but it may lend to your goals alot more than those stock heads. Also alot lighter always good for mud.

Sorry dont mean to get off track. Just some engine porn.
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Old 10-20-2012, 07:06 PM
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I can get them for free my friend bought new heads so im just asking if there better than what I have. Its a free head. With new springs and a port job will they be any better than my current heads for the application. It will help lower my compression to estimated 10.6:1. Which means possable sunoco 93
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  #27 (permalink)  
Old 10-20-2012, 07:30 PM
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The price should be a clue. Those 882 heads are crap. You're trying to build a fubared engine using everyone elses cast off junk . Gets some flat top pistons and build it right. Vortecs or ported 1.94 x 1.60 valve 4416 heads will work very well at low cost. There are many good heads to choose from ... 58 to 64cc w flat tops pistons.

5.13 gears works.
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Old 10-21-2012, 01:58 AM
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I allredy have dome pistons in the bottom end .275 dome. +14cc dome. I would still be +8 cc over a stock 64cc with flat top. Thats the reason for thinking of goin with the 72cc. And they have to be better than 193 heads. I dont have 1400 to spend on new heads right now. So back to my question. 882 or 193? I will later be upgrading them but im currently on a budget. I have 350 set aside for cam lifters n springs. I have put to much into the bottom end to splurge on the rest and I must have this running by newyears. So for the next year. What am I better off with.
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  #29 (permalink)  
Old 10-21-2012, 05:18 AM
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IF- and that's a big if- you can expertly port the heads, use the swirl ports and hope for the best. The 883s are just not worth putting any time into IMO.

The problem here is you're asking what's better, a broken left leg or right leg. Neither are worth a timker's damn and using such a large domed piston isn't your friend, either.

If you insist on building this, as least avail yourself of the available info on quench and things to check in the valve train, including the geometry.

Also read up on cam break in procedures and setting up the distributor's advance curve.

Good luck. As the saying goes, you are gonna need it...
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Old 10-21-2012, 07:49 AM
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Quote:
Originally Posted by Bogger View Post
I allredy have dome pistons in the bottom end .275 dome. +14cc dome. I would still be +8 cc over a stock 64cc with flat top. Thats the reason for thinking of goin with the 72cc. And they have to be better than 193 heads. I dont have 1400 to spend on new heads right now. So back to my question. 882 or 193? I will later be upgrading them but im currently on a budget. I have 350 set aside for cam lifters n springs. I have put to much into the bottom end to splurge on the rest and I must have this running by newyears. So for the next year. What am I better off with.
The link i posted for the $600 a set ebay heads the guy has alot of stock castings built and ready to go. The performance ones he has in all head cc 87 76 64 58. I think they are proform cheap castings he builds up in house. His oem heads complete are cheaper then my machine shop charges to go thru a set. You can get Much better castings ready to bolt on for less then 400 bucks. My machine shop charged me 500 for the last set they did for me.

As far as your heads pump gas is the way to go 99% of the time. Race gas is dam pita after a while of having to live with it. I would do anything that let me run pump gas and save for the good stuff.

Last edited by hcompton; 10-21-2012 at 07:55 AM.
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