Absolute Speed Stage II 5.3 Heads
03-06-2008, 01:25 PM
#1
Teching In
Thread Starter
Join Date: Nov 2003
Location: Memphis, TN
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
Absolute Speed Stage II 5.3 Heads Overview: Absolute Speed Stage 2 5.3 Heads with 58cc chambers.
Details:
I purchased these heads a while back and drove on them for approximately 1 week. I had miscalculated my dynamic compression ratio, and the actual DCR was too high for pump gas with my particular setup. They are in fantastic condition. I replaced several valves, did a valve job, and milled the combustion face to clean up some knicks. The work was done at a top machine shop in the Memphis area. I work at a cylinder head manufacturing plant, and we use this same shop for specialty work outside of regular production. Prior to my purchase of the heads, the chambers had been opened up to unshroud the intake valves. This increased the chamber size, but the face milling brought the chamber size down to 58cc.
They are the Permanent Mold Casting version of the head which is touted as being good for a few more hp due to less core drift in the casting process.
Many of you may not remember Jay or Absolute Speed, but he made some of the finest heads on the market. The intake valves are made by Manley and are 2.02". I don't remember off the top of my head the specs on the exhaust valves. I can check on that later tonight.
A word of caution: These have 58cc chambers. They will provide too much compression for many cam/shortblock combos. Be sure that a 58cc combustion chamber is what you want.
I can provide them assembed with Patriot Gold dual springs and ti retainers for $900 obo. The valvestem seals (viton) have maybe 50 miles them, but the springs have about 10k.
If you prefer, I can sell them without the springs/seats/seals for $800 obo.
Will post pics later tonight or tomorrow.
Details:
I purchased these heads a while back and drove on them for approximately 1 week. I had miscalculated my dynamic compression ratio, and the actual DCR was too high for pump gas with my particular setup. They are in fantastic condition. I replaced several valves, did a valve job, and milled the combustion face to clean up some knicks. The work was done at a top machine shop in the Memphis area. I work at a cylinder head manufacturing plant, and we use this same shop for specialty work outside of regular production. Prior to my purchase of the heads, the chambers had been opened up to unshroud the intake valves. This increased the chamber size, but the face milling brought the chamber size down to 58cc.
They are the Permanent Mold Casting version of the head which is touted as being good for a few more hp due to less core drift in the casting process.
Many of you may not remember Jay or Absolute Speed, but he made some of the finest heads on the market. The intake valves are made by Manley and are 2.02". I don't remember off the top of my head the specs on the exhaust valves. I can check on that later tonight.
A word of caution: These have 58cc chambers. They will provide too much compression for many cam/shortblock combos. Be sure that a 58cc combustion chamber is what you want.
I can provide them assembed with Patriot Gold dual springs and ti retainers for $900 obo. The valvestem seals (viton) have maybe 50 miles them, but the springs have about 10k.
If you prefer, I can sell them without the springs/seats/seals for $800 obo.
Will post pics later tonight or tomorrow.
03-07-2008, 07:38 AM
#5
OK so if I put these on a stock LS1 and decided to change my cam as well how big could I go on the cam without having to do any changes to the pistons or heads? I dont want to run into the problem you did with the compression being to high either.
03-07-2008, 02:03 PM
#6
Teching In
Thread Starter
Join Date: Nov 2003
Location: Memphis, TN
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
OJ: Thanks for the bump!
jshelton: PM sent
MCSS: Sorry, no flow numbers. I remember intake flow being over 300, but I don't know the exact figures. If you dig a little, I'm sure you can find them on this site somewhere.
phpd: I'm no expert, but I would guess that flycutting will be necessary. I was running 232 degrees of intake duration at .050", and while it clayed fine and ran fine with respect to PtoV clearance, the compression was just too high. Running more duration will cause a decrease in that clearance, so I'd suggest flycutting. Flycutting will allow you to run pretty much any cam you want with safe compression numbers. The flycutting job wouldn't be that hard since you'll have the heads off anyway. You could use one of your stock heads to line up the cutter bit.
jshelton: PM sent
MCSS: Sorry, no flow numbers. I remember intake flow being over 300, but I don't know the exact figures. If you dig a little, I'm sure you can find them on this site somewhere.
phpd: I'm no expert, but I would guess that flycutting will be necessary. I was running 232 degrees of intake duration at .050", and while it clayed fine and ran fine with respect to PtoV clearance, the compression was just too high. Running more duration will cause a decrease in that clearance, so I'd suggest flycutting. Flycutting will allow you to run pretty much any cam you want with safe compression numbers. The flycutting job wouldn't be that hard since you'll have the heads off anyway. You could use one of your stock heads to line up the cutter bit.
Trending Topics
07-03-2008, 05:31 PM
#8
Teching In
Thread Starter
Join Date: Nov 2003
Location: Memphis, TN
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
Ok, so I've been really busy lately and haven't really been thinking about these. Sorry! I promised pics previously, and here they finally are.
Same deal... $900 assembled, $800 without springs/retainers/seats/seals.
Great heads, I just have no use for them.
Same deal... $900 assembled, $800 without springs/retainers/seats/seals.
Great heads, I just have no use for them.
07-11-2008, 01:23 PM
#10
Teching In
Thread Starter
Join Date: Nov 2003
Location: Memphis, TN
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
Ok, so I'm going on vacation starting next Thursday and could definitely use some extra cash on the trip. This week only, I'll let these go for $650 assembled, $550 without springs/retainers/seats/seals.
07-11-2008, 02:14 PM
#11
On The Tree
iTrader: (28)
Join Date: Feb 2006
Location: Clifton Heights,Pa
Posts: 165
Likes: 0
Received 0 Likes
on
0 Posts
any chance of getting some more pics,maybe 1 or 2 of exhaust side?Also,what happened that you have to replace some valves and clean up the chambers?Send to Tom01SS@aol.com
07-11-2008, 06:34 PM
#13
Teching In
Thread Starter
Join Date: Nov 2003
Location: Memphis, TN
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
I am a manufacturing engineer at a Cummins plant. We do cylinder heads, turbochargers (my area), water pumps, air compressors, con rods, and several other products. We also remanufacture components, and some of the standard things we do to every cylinder head, regardless of present condition, are things like replacing valve guides, milling the combustion face, grinding the valves and valve seats, etc. I simply took that same approah to these heads. I had them done at a local machine shop, as most of our equipment is setup and tooled for VERY large cylinder heads (a single ISX head casting weighs over 450 lbs).
Upon grinding the valves, we discovered that a few of the valves were bent ever so slightly. The ground surface was not completely even all the way around the valves (the concentricity was only out by a VERY small amount). We used to have processes to straighten valves at our plant, but those have since been moved to other facilities. Valves are cheap, so I replaced the bent ones.
I'll post up more pics later tonight. Thanks for the interest!
Also, I took the liberty of soda blasting the heads to clean off carbon deposits and other grime. I didn't spend long on it, just enough to get off the obvious buildup. They were then sent through a chemical wash to degrease them a bit further, dissolve any remaining soda, and give them a coating of rust preventative.
Upon grinding the valves, we discovered that a few of the valves were bent ever so slightly. The ground surface was not completely even all the way around the valves (the concentricity was only out by a VERY small amount). We used to have processes to straighten valves at our plant, but those have since been moved to other facilities. Valves are cheap, so I replaced the bent ones.
I'll post up more pics later tonight. Thanks for the interest!
Also, I took the liberty of soda blasting the heads to clean off carbon deposits and other grime. I didn't spend long on it, just enough to get off the obvious buildup. They were then sent through a chemical wash to degrease them a bit further, dissolve any remaining soda, and give them a coating of rust preventative.
