| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
02-02-2004, 06:28 AM
|
|||
|
|||
Would you fill the crossover in head with lead or aluminum? Most builders I've talked to said fill it with lead. They claim they have been filling heads with lead for 30+ years without a problem. They said melting aluminum pistons would have too much crap in them to do a good job. Will the lead hold up to the heat? I'm looking to fill my heads this winter.
|
|
#2
02-02-2004, 06:28 AM
|
|||
|
|||
|
Would you fill the crossover in head with lead or aluminum? Most builders I've talked to said fill it with lead. They claim they have been filling heads with lead for 30+ years without a problem. They said melting aluminum pistons would have too much crap in them to do a good job. Will the lead hold up to the heat? I'm looking to fill my heads this winter.
|
|
#3
02-02-2004, 06:56 AM
|
|||
|
|||
|
Fill with ALUMINUM!!! If you go back through the pages here, you will find plenty of info on how to do this properly. Maybe lead will work on SBC's relativly small holes in the ex. ports, but WILL melt in a pontiac!-Bob.
|
|
#4
02-02-2004, 09:19 AM
|
|||
|
|||
|
This is not good...machinist has already poured lead in crossovers of #16's.....ahhhh
|
|
#5
02-02-2004, 12:06 PM
|
||||
|
||||
|
I have seen them plugged with a freeze plug!
__________________
Keith Collier 61-63 Pontiac Tempest Tech advisor POCI.org |
|
#6
02-02-2004, 04:18 PM
|
|||
|
|||
|
Where the hell do you get a "square" freeze plug??
|
|
#7
02-02-2004, 05:26 PM
|
||||
|
||||
|
Mechanickeith - you must be talking about the water crossovers...
Life is too short to listen to ricers!
__________________
1969 GTO, 3370 lbs, 10.5” tire... 07/31/21 Norwalk 9.42 @ 142 1/4, 5.95 @ 115 1/8th mile 3400 lbs...535 with Junk dinosaur Eheads |
|
#8
02-03-2004, 06:36 AM
|
|||
|
|||
|
It's really great to see All the wonderful Pontiac guys stickin their necks out to help a fellow Pontiac enthusisit out of a fix....
Is it like this in Mopar land too? I thought this would be a no brainer....and get some good answers on this. The guy that is doing the work does a great job and has been for 30+ years...ok maybe he is a little stubborn, I did ask to have aluminum poured in the crossover(in the head)! But he seams to think with the water jackets cooling the casting of the head, lead won't melt....and besides I've done this many times before. he said. So if you guys in the know could help a guy out... I promise never to buy a Mopar! |
|
#9
02-03-2004, 07:55 AM
|
||||
|
||||
|
I would say lead is not a good idea - it melts too easy, is too heavy - but if the guy did it before then...... It gets pretty hot at the center exhaust ports - do not retard your timing.
I always use aluminum and never heard of lead filling. ~~~~~~~~~~~~~~~~~~~~~~~~~ www.spottsperformance.com
__________________
~~~~~~~~~~~~~~~~~~~~~~~~~ www.spottsperformance.com East Coast Pontiac engine builder - still going strong 4 month waiting list email spotfam@verizon.net 1981 Trans Am 455 w/6X heads 4 speed 4 wheel disc (for sale) 1969 Trans Am clone 9.79 at 139 so far 1964 Banshee clone project - Opel GT platform |
|
#10
02-03-2004, 08:34 AM
|
|||
|
|||
|
Thanks Paul!
I will be calling you to buy some parts soon. I probally should of have do the heads too... but this guy did build the engine before I bought the car, thought I give him some more work. I will have him re-pour with aluminum like I asked for in the first place. |
|
#11
02-03-2004, 08:47 AM
|
|||
|
|||
|
re-pour with aluminum billet in the next few days
|
|
#12
02-03-2004, 04:59 PM
|
||||
|
||||
|
An engine builder buddy of mine has done this two ways. If the shop can furnace braze cast iron, it can be welded. However, now their shop uses molten aluminum.
The melting point of Lead is 327C. Tempest455 http://www.wauknet.com/douthitt/
__________________
Tempest455 |
|
#13
02-03-2004, 05:49 PM
|
|||
|
|||
|
How well do those blocking intake gaskets that warrior sells work?
|
|
#14
02-03-2004, 07:48 PM
|
||||
|
||||
|
Hard Block work?
"Somebody sell me a 78 Catalina grille, please",15 yrs in NHRA tech ret. 413 rpm 4150 3.73 hoosiers 13.54 4050# Winter Sucks www.nhra.com www.ihra.com
__________________
NHRA tech. "Its just a 412, I swear it". Pontiac tip of the year, quit those damn cigarettes. 
|
|
#15
02-03-2004, 08:06 PM
|
||||
|
||||
|
Using and intake blocking gasket still does not separate the exhaust cross-over in the bowl. It only minimizes the heat reaching the intake. The exhaust bowl cross-over is the area that needs to be filled.
A number of years ago, I recall being at Dan Whitmore's shop and he said they ran a car with and without the cross-overs filled in the heads and it was worth .20 on average. Dan felt it added a measurable amount of torque to the bottom end. Tempest455 http://www.wauknet.com/douthitt/
__________________
Tempest455 |
|
#16
02-04-2004, 04:17 PM
|
|||
|
|||
|
Wow! I did not even think of the heat in the heads, I was only thinking of the effect on the intake manifold temp. Does this really make a car run bad cold? Near where I live is suppossed to be a guy with a '69 GTO very set up for road course who has a warrior intake. Suppossedly he uses a hair dryer on the intake before start up.
|
|
#17
02-04-2004, 07:56 PM
|
|||
|
|||
|
Well for what it's worth, being an OLDS man here.
Your tech info works fine for my Olds, That's why Im here... I allways have used ZA 12, (Zink/Aluminum alloy melts at about 850 degrees F) I fill the crossover all the way to the valve guide on the center ports then I blend it in to make the bowls match the outer ports. I've heard other guy's say they have melted the ZA 12 in thier heads, but I've never seen it with any of my stuff. Id be pretty worried about melting lead though, what is 326 C in regular old F? All OLDS all the time!!!
__________________
All OLDS all the time!!! |
|
#18
02-07-2004, 07:57 PM
|
||||
|
||||
|
We use cut up transmission pistons. Melt them in a crucibal with a rosebud.
__________________
1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 462, SD prepped Kaufman D ports. 11.90 @ 112 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.50@159 2009 G8 GT |
|
#19
02-08-2004, 03:59 AM
|
||||
|
||||
|
<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by BBO:
what is 326 C in regular old F? All OLDS all the time!!!<HR></BLOCKQUOTE> 326 C is approx 620 F 67 Firebird Convert 455 +.060 #62 heads piston dished 16cc H-beam rods Comp Cam 305-H cam 253/260 @.050 duration .577/.594 lift w/1.65 rockers Ford 9" 3.55 Detroit Locker Honest dad, that 455 on the side of the block is a serial number 
__________________
67 Firebird Convert 455 +.060 TH400 74cc KRE d-ports piston dished 16cc H-beam rods Comp Cam 305-AH-8 cam 108* LSA 253/260 @.050 duration .577/.594 lift w/1.65 rockers Ford 9" 3.50 Detroit Locker M/T Sportsman Radials 31x18x15 on Convo Pro 15x15s |
|
#20
02-08-2004, 05:05 AM
|
||||
|
||||
|
618.8 F to be exact.
http://wscope.com/convert.htm |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
