ok thanks guys, hell maybe I can lay a sob storie on him and get my money back, lol he also has a 350 shortblock assembled with new rings and bearings but when I looked at it, I tried to turn the crank by hand and could not budge it. To me this threw up red flags, what about you guys?

 

by the way the oil pan is off it and I was trying to turn it by pushing on the crank where the rods bolt up

 

Try turning it by hand with the balancer on the crank. Just grab ahold of the balancer and hopefully it turns pretty easily.

 

not trying to be rude just blunt

but by saying these are the next best thing to double humps is like saying


32 weight printer paper is the next best thing to newspaper for wiping your bum....

they are both not so great heads

least if by double humps you refer to the camel heads of the old days


another thing if you could stay away from domed pistons. granted if you need to get compression it might work

but generally dome pistons are not very efficient and tend to hamper the flame front which will cause detonation issues and power issues


using a flat or even dish head(reverse dome) pistons with a small cc head would be better thing to do and end up letting you run more compression without detonation worries and make even more power yet

 

it should turn with minimal amount of force right not straining right? cause it takes some umfh to get it to turn and I mean alot of umfh, lol

 

rx7speed I am not trying to debate heads here i just stated what I was told sheeeeeshhhhhhh, you are all very touchy about heads lol

 

lol not touchy
if anything trying to help out :-)



would you honestly rathre have us keep out mouth shut only to find when you put the motor together grandmas honda insight takes you out?

 

lmao no dont want granny wippin my *** but I was not asking about the heads I was just letting people know what I was gonna use. lol grannys insight hehehe

 

Its because some people on this board actually know and understand that the heads are what make power.

 

With the right cam, 11.5 could maybe be done with 92 or 93, whichever is available. To pull that off though, you'll have to have a cam with alot of duration and alot of overlap to bleed off excess cylinder pressure, and have the ignition timing absolutely perfect.

You'd be much better off keeping it below 10.5 though.

882 heads do suck. They are the worst of the worst. Not only do they have tiny little ports with tiny little flow numbers, they have huge and poorly designed combustion chambers. The castings are also very thin, and crack pretty easily. Basically they have absolutely nothing going for them.

Double hump heads are good heads, but are dated in their technology. They were designed over 40 years ago. Many improvements to cylinder head design have come since then. They are miles and miles ahead of 882s as a performance part though.

If you are trying to turn the engine over by hand, it won't be easy. It should be able to turn, but will take some muscle to do it, especially if this engine hasn't been run and totally soaked in oil yet. You should be trying to turn it by the balancer though, that seems like the easiest place to do it from.

 

well it does not have a ballencer or flywheel on it

 

Bring one, or see if he has one, you just need it to turn the motor.

 

A fresh SBC long block should turn over w/around 55 lb-ft of torque applied to the crank. Bring a tq wrench and try that on the balancer nut.

I'd swap the heads and pistons on the 400 though too. More tq and potential than the 350.

-Tom

 

Anyone have any flow data on the 882 heads? The only thing I can find out there is the CHP Westech flow data,, and they're flowing as well as a set of 180cc Dart Iron Eagles on the intake side. Could have been a ringer set of heads though,,, no real telling if they were cleaned up a little or not. All I know is I've built a could domed 406s with mildly touched up 882s for a couple folks and they ran well,,, especially for the money involved.

 

http://www.thesuccesssolution.com/si...488&page=97367

Scroll down to the graphs. Second one down. Not that good.

-Tom

 

One of the things about SBC heads is, the basic design concept of the head is good to begin with. Even the low performance ones, with the exception of the swirl port type.
If you compare SBC heads to other domestic car heads from the same era, you'll see they've got reasonably efficient ports and a generous quench pad (I guess that's what it's called).
If I were given the choice between a 400 with 76cc factory heads and a 350 with some better L98 heads, I'd take the 400. Because it would still be fun to drive, til you can afford a better set of heads.
Of course there are a lot of variables to the combos that can tip the scale in either direction as far as which would actually be a better engine choice. But a 400 with some small domed pistons and 76cc heads wouldn't be a gutless engine if the rest of the stuff were matched up right.

 

I was finaly able to get the numbers off the pistons. they are JE 617F forged dome that is the only numbers on them?? I thought they were wiseco because they are in a wiseco box, my mistake

 

Can't find much about those:

SBC JE pistons
1 set 4.130" bore, 1" compression height, flat top, JE # 617F *No wrist pins $100
1 set 4.150" bore, 5.7" rod, .450" dome, JE # 617, lightened, gas ported top ring

They must be pretty old. You probably gonna need to find somebody with an old JE catalog.

 

http://kb-silvolite.com/performance....tails&P_id=103
http://kb-silvolite.com/performance....tails&P_id=213
http://kb-silvolite.com/performance....tails&P_id=104
http://kb-silvolite.com/performance....etails&P_id=72
http://kb-silvolite.com/performance....tails&P_id=101

Which of the pistons shown in the above links looks most like the ones you have?
Since the pistons you have came in a different box, are you 100% sure they're domed?
Cause last summer there was a guy asking about some domed pistons he got, then when he posted a pic they were dished.

 

looks closer to the 3.5cc the domed ones have the raised dome on them right, lol

 

Yes the 3.5cc one is a domed piston.
Is that your final answer?

 

ummm can I call a friend or should I ask the audience? lol yea that is the closest pic I have seen to what it looks like.

 

Post a pic and the audience will answer.

 

I Tried to get a pic today but my D@%* digital camera stopped working.

 

the guy said he would give me my money back or he has the 355 short block assembledvwith flattops I could swap it for. I am just leary of it because he took it in on trade and Ihave never seen a new rebuilt motor that tight. Of course, there is nothing but assembly lube on it, it has not touched oil yet and that might have something to do with it, I don't know.

 

Freshly rebuilt motors are really tight. Esp with all that assy lube. It almost feels like they're siezed.
I wouldn't get those domed pistons if you have a choice, the CR would be too high to build a reasonable combo for the street.
Like Air Adam said you could do it with a big cam, but it's not the best choice.
I'd get the rebuilt 350 and then disassemble it and double check everything. But then you might just run it and be fine too.

 

~55 lb-ft.
Check it, then you'll know if it's too tight or not. No need to guess about that.

-Tom