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Author Topic:   882's with 1.72 intake valves????
dode
Dirt Freak

Total posts: 417
posted March 30, 2002 10:29 AM UIN: 13209501
My friend took a set of 882's into a reputable head shop today to have a valve job done and new guides put in, and the owner of the place told him that these had 1.72 valves and were from a truck. They are stamped 333882 just like the set I have in my basement. I have ton a ton of searches online, and I can find no reference to this. Has anyone ever heard of this before??? This has me totally baffled. Thanks.

John

NYhick
Dirt Forum Racer

Total posts: 82
posted March 30, 2002 11:05 PM
I just looked these up and found the following..... 333882= 1.94/1.50....75cc... out of a 74-80 GM 350. Not going to get to many ponies out of these babies. Unless your class requires these type of heads, I would bring them to the scrap yard. I guess you could have them shaved to boost your CR, but by the time you do that you could just buy a good set of older 2.02's that will whip up on those 882's.

dode
Dirt Freak

Total posts: 417
posted March 30, 2002 11:24 PM UIN: 13209501
I did some measuring, and those heads were in fact sized for 1.72 intake valves. As for our rules, we have to run 9:1 compression with flat top pistons, so we are pretty much stuck with large chamber heads. Also, if the heads came with two different valve sizes, we have to run the smaller size. I don't even know of any large chamber heads that only came with large valves. I hate these rules...

John

ford5
Dirt Freak

Total posts: 298
posted March 31, 2002 07:09 AM
john, seen this all the time 882's came with both 1.94s and 1.72s i think they also came in 350 and 400 (steamholes) versions they also came with some 3\8ths exhaust valve guides on the truck apps. if i remember right

dode
Dirt Freak

Total posts: 417
posted March 31, 2002 10:06 AM UIN: 13209501
Why isn't that listed in any of the head casting number charts I have found? I have found like 10 of them, and NONE of them said that. That would also explain why the 11/32 exhaust valves fit really loose in there. Oh well...the shop gave me what I paid for the castings, $20, so I don't have to worry about it any more.

John

Flatlander
Dirt Freak

Total posts: 310
posted March 31, 2002 10:40 AM
this is just a thought why not use a better head and thicker head gaskets I really don't know how thick you can get them but even with the comp. down you would have better flow myself I would run adish with good heads before I ran flats with a weak head in your situation but I know like everyone$ is the key JMO

dode
Dirt Freak

Total posts: 417
posted March 31, 2002 10:52 AM UIN: 13209501
Flat top pistons are required by rule, otherwise I would have done that a long time ago

Biggest head gaskets I have seen are .051 thick. That is a felpro, and compresses to like 11.2 cc's. That still doesn't meet our compression requirements on a 355. Unless anyone else knows of different head gaskets, but I really don't think you would want to run any thicker.

John

Flatlander
Dirt Freak

Total posts: 310
posted April 01, 2002 12:46 PM
Thats a weird rule they usaully don't catch that most tracks say flattops but allow stock which is a dished piston I guess difference is what it takes

dode
Dirt Freak

Total posts: 417
posted April 01, 2002 12:53 PM UIN: 13209501
hmmm...both our main motor, and the backup motor came with flat top pistons. The backup is 60 over and fairly newly rebuilt out of a junk van, and the other was what was in the race car when we bought it. I know the rules say flat tops. That's what we have (they do have valve reliefs of course, so they aren't TRUE flat tops.)

John

Flatlander
Dirt Freak

Total posts: 310
posted April 01, 2002 10:51 PM

just about all your reman . motors will have 4eye brow flattops but a lot of 350's came stock with a dish piston we call them soup can's and they are allowed those and f/tops but no popups of any sort

dode
Dirt Freak

Total posts: 417
posted April 01, 2002 11:03 PM UIN: 13209501
****it...shop called today and the heads are cracked...what to do, what to do...

John

Flatlander
Dirt Freak

Total posts: 310
posted April 02, 2002 01:01 PM
your luck sounds about like mine sometimes as my wife says why don"t you consider fishing Lol

[This message has been edited by Flatlander (edited April 02, 2002).]

bbchs
Dirt Full Roller

Total posts: 30
posted April 06, 2002 08:57 PM
I know this a little too late to help. I own a machine shop, and fitting those 882's with 1.94 in. valves is a pretty easy deal. Your machine shop could have cut the in. seats for 1.94 valves and then went back and opened up the bowls under them. It isn't too expensive (cheaper than another set of heads). He probably had some good used in. valves and if the didn't, they are only about $3.00 ea. new. If you are stuck with an open chamber head the 882 is about as good as it gets.

Good luck...Chuck

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