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Author Topic:   487xheads
shay
Dirt Roller

Total posts: 18
posted July 20, 2003 05:45 PM  
I came across a set of 487x 350 chevy heads.I am running 882s right now.I was wondering what the diff is between these heads and the standard 487 heads, and if it is worth swapping the 882s for the 487x.We have to run flat top pistons, 390 410 lift cam and stock (big) rochester 2 barrel.Im not sure if these heads flow well or not.Any advice wouild reall be appreciated.Thanks alot TH.

WOODDOG
Dirt Roller

Total posts: 5
posted July 20, 2003 05:54 PM  
ANYTHINGS BETTERIN MY OPINION THEN AN 882 PICKUP TRUCK HEAD... LOOSE THOSE. THE X HEADS ARE ABOUT THE SAME. FIND SOME 461, 462 OR GO TO CHEVY PLACE OR SCOGGIN DICKEY AND BUY SOME NEW 492'S . DEPENDS - YOU NEVER SAID ANYTHING ABOUT WHAT YOUR RUNNING THEM ON." CLASS" THAT IS.
IF I WANTED TO RUN CHEAP, BUT FAST ON A BUDGET, GET THE 305 H.O HEAD. ALOTTA COMPRESSION, SPEED !!!!SALVAGE YARD SPEED !
USE GOOD SPRINGS AND STEEL SHIM H.GASKETS .

[This message has been edited by WOODDOG (edited July 20, 2003).]

shay
Dirt Roller

Total posts: 18
posted July 20, 2003 06:38 PM  
The car in a bomber that weights 3100 lbs.We can only run large chamber heads.993 882 441 624 186.Any advice would really help.Thanks TH.

ruggs66
Dirt Maniac

Total posts: 193
posted July 20, 2003 06:57 PM  
the 186 is a small chamber head.

shay
Dirt Roller

Total posts: 18
posted July 20, 2003 10:04 PM  
Sorry.I meant 185.

racer17j
Dirt Forum Champ
Total posts: 5390
posted July 20, 2003 10:47 PM  
well here we are again according to flow numbers the 441 and 487 are better the 487x heads are a heavy truck head and dont flow as well as some if you are running a 9 to 1 motor the 441 are your bewst choice and then 487 then 993 then 882 but i wouldnt use the 882 in a motor that runns hot or around 230 all the time because the crack easy
Plus the 441 are a 76 cc head and the 487 are a 75 cc head but the 441 outperform the 487 on the flow bench

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you never know how fast you are going when your in the lead, until you blow the announcers hat off!!!

rico 08
Dirt Forum Champ
Total posts: 1139
posted August 12, 2003 11:16 AM  
I've always heard the x in the number means it's off a corvette,i've got one 441 head but it's very rusty and in need of some attention,i'd trade for a 492 or a double hump and pay the shipping both ways.The 441 is supposed to be getting hard to find.

iowa_dirt_track_girl
Dirt Freak

Total posts: 461
posted August 12, 2003 11:26 AM  
actually who ever told you that is wrong if you would like to know more info on the head numbers www.geocities.com/meanracing/HeadCastingNumbers.html will tell you what you need to know

[This message has been edited by iowa_dirt_track_girl (edited August 12, 2003).]

Speedway65
Dirt Freak

Total posts: 344
posted August 13, 2003 01:03 PM  
The x just means its a revision to the casting.It just saves the factory from coming up with a new part #As for web sites try www.mortec.com the head is from a 71-72 LT1

Jeff

[This message has been edited by Speedway65 (edited August 13, 2003).]

jammin
Dirt Administrator

Total posts: 6243
posted August 13, 2003 01:06 PM  
The thing that everyone needs to realize is the actual absence of multiple flow numbers on these types of heads. I have seen flow numbers on ported 487x heads that would blow your mind! (over $1200 for porting alone)
Personally I accept the 487X head as the 441's equal, have seen the numbers to support this. There is a local engine builder who swears the 993 is the best. The problem with the info is you can't base everything on one site or one persons opinion.
Another reminder to all, 882's win more than thier share of races. They are plentyful, and don't crack as much as everyone has read. My advice to many racers out there is don't heed one authors advice as LAW. You have to be able to get a set of heads in order to race. The 441's and 487's are getting rare, and can be substitued easily. Good luck.

shay
Dirt Roller

Total posts: 18
posted August 29, 2003 09:22 PM  
Thanks for the info guys.This website has been a huge help .Thanks again.T H

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