ported 853 castings
There WILL NOT be a notable difference between a 853/241 head when both are ported. So, anyone that posts good numbers with ported 241s, you could expect something in that neighborhood if your heads have a good port job on them.
Ben T.
Ben T.
I just put a set of 853 heads that were ported and milled with a mti224/224 112 cam. I havent got it tunned yet but it runs good on a stock tune and allot of power. Im still breaking in the heads so i havent really got on it yet but i can tell by how it pulls on the low end that it will have lots of power in the top end. Im not going to have $ for tune until january so i will post my results then.
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There's also no difference between a ported 1998 head and a ported 2002 LS1 head fwiw. 
The SPM castings are more accurate and have a better surface finish, but the correct burr and cartridege roll can have both indistinguishable after porting. Also, they're both GM heads so they're going to be quality castings. Core shift should be minimized unlike some of the Brodix heads I've ported. Even after a bowl hawg has been run through the throat of the port the seat and port still won't line up, and you're left with a lip below the valve seat. You can only shape the port so much without creating a stagnant zone to get rid of it. On GM stuff you shouldn't see that kind of misalignment.
Ben T.
The SPM castings are more accurate and have a better surface finish, but the correct burr and cartridege roll can have both indistinguishable after porting. Also, they're both GM heads so they're going to be quality castings. Core shift should be minimized unlike some of the Brodix heads I've ported. Even after a bowl hawg has been run through the throat of the port the seat and port still won't line up, and you're left with a lip below the valve seat. You can only shape the port so much without creating a stagnant zone to get rid of it. On GM stuff you shouldn't see that kind of misalignment.Ben T.
Last edited by Studytime; Nov 15, 2006 at 01:29 AM.
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Originally Posted by Studytime
There's also no difference between a ported 1998 head and a ported 2002 LS1 head fwiw. The SPM castings are more accurate and have a better surface finish, but the correct burr and cartridege roll can have both indistinguishable after porting. Also, they're both GM heads so they're going to be quality castings. Core shift should be minimized unlike some of the Brodix heads I've ported. Even after a bowl hawg has been run through the throat of the port the seat and port still won't line up, and you're left with a lip below the valve seat. You can only shape the port so much without creating a stagnant zone to get rid of it. On GM stuff you shouldn't see that kind of misalignment.
Ben T.
The SPM castings are more accurate and have a better surface finish, but the correct burr and cartridege roll can have both indistinguishable after porting. Also, they're both GM heads so they're going to be quality castings. Core shift should be minimized unlike some of the Brodix heads I've ported. Even after a bowl hawg has been run through the throat of the port the seat and port still won't line up, and you're left with a lip below the valve seat. You can only shape the port so much without creating a stagnant zone to get rid of it. On GM stuff you shouldn't see that kind of misalignment.Ben T.
Staging Lane
Joined: May 2004
Posts: 54
Likes: 0
From: Silver Spring, MD
Originally Posted by john563
is there anyone thats cammed and have ported 853 casting heads(perimeter bolt pattern) and how much hp power did it give you?
thanks
john
thanks
john
the cam I have is a tr224/112 cam and its a stalled(tcissf34-3800 stall)a4,puts down 350rwhp and was wondering what to expect with ported 853 castings.Are they worth putting in or save for 243 castings?Gunner quoted me a good price and just wanted to know what to expect out of 853 castings.Would i need to upgrade the fuel pump and injectors if I added heads?Right now Im at %80 duty cycle with the 28lb injectors.I was gonna add new injectors and pump when I add n20 and rear end in the summer or do I need to upgrade the fuel when I add the heads?Just want to make more power NA before I spray,so if anyone with this size cam and these heads let me know what you put down and are you a4 or stick and did you have to upgrade your fuel
thanks
john
thanks
john
Again just search for anybody that has ported LS1 heads and see what kind of power they are making. There are many ported head/224 combo's out there. Are they worth putting on? I've seen as high as an advertised 60rwhp gain from GTP ported stock heads. Don't get hung up on the fact that they are 853 castings. The quality of the port work is way WAY more important than what casting they started out as before they were ground on. It will be hard to tell if they are a "good" head or not without actually trying them. You can have great flowbench numbers, but a dyno might tell a different tale.
To answer your questions,
What to expect? Depends on how well they're ported. A good gain would be 30-40+ hp from them.
Should you save for 243 castings? If you already have the 853s, they're worth a try. You already have them.
Your fuel pump should be good for basic h/c power level, but you will be running DC on your injectors high. I personally know of several 400rwhp m6 cars on the stock fuel system without a single change if that helps you any.
Good luck.
Ben T.
To answer your questions,
What to expect? Depends on how well they're ported. A good gain would be 30-40+ hp from them.
Should you save for 243 castings? If you already have the 853s, they're worth a try. You already have them.
Your fuel pump should be good for basic h/c power level, but you will be running DC on your injectors high. I personally know of several 400rwhp m6 cars on the stock fuel system without a single change if that helps you any.
Good luck.
Ben T.
Originally Posted by Studytime
Again just search for anybody that has ported LS1 heads and see what kind of power they are making. There are many ported head/224 combo's out there. Are they worth putting on? I've seen as high as an advertised 60rwhp gain from GTP ported stock heads. Don't get hung up on the fact that they are 853 castings. The quality of the port work is way WAY more important than what casting they started out as before they were ground on. It will be hard to tell if they are a "good" head or not without actually trying them. You can have great flowbench numbers, but a dyno might tell a different tale.
To answer your questions,
What to expect? Depends on how well they're ported. A good gain would be 30-40+ hp from them.
Should you save for 243 castings? If you already have the 853s, they're worth a try. You already have them.
Your fuel pump should be good for basic h/c power level, but you will be running DC on your injectors high. I personally know of several 400rwhp m6 cars on the stock fuel system without a single change if that helps you any.
Good luck.
Ben T.
To answer your questions,
What to expect? Depends on how well they're ported. A good gain would be 30-40+ hp from them.
Should you save for 243 castings? If you already have the 853s, they're worth a try. You already have them.
Your fuel pump should be good for basic h/c power level, but you will be running DC on your injectors high. I personally know of several 400rwhp m6 cars on the stock fuel system without a single change if that helps you any.
Good luck.
Ben T.
I bought my car the TR224 cam w/ ported and milled to .035 241s. I finally got the car tuned and made 359rwhp 336rwtq unlocked. I haven't gone to the 1/4mi track but I did a 7.34 in the 1/8mi. But here are the flow #s on them
050 36 37.5
.100 66.6 67.5
.150 100.7 102.4
.200 137.6 139.9
.250 169.7 176.2
.300 194.5 204.0
.350 217.1 229.7
.400 231.2 251.6
.450 234.6 268.7
.500 230.2 280.4
.550 234.1 291.3
.600 238.1 290.0
050 36 37.5
.100 66.6 67.5
.150 100.7 102.4
.200 137.6 139.9
.250 169.7 176.2
.300 194.5 204.0
.350 217.1 229.7
.400 231.2 251.6
.450 234.6 268.7
.500 230.2 280.4
.550 234.1 291.3
.600 238.1 290.0
A local in my area made 400rwhp through a 3200 Vigilante with a TR224 and mildly cleaned up 1998 heads with 2.02/1.57" valves. Take that for what you want.
The quality of the work is more important than the casting number.
00Freak, don't get too caught up on dyno numbers. Based of your 1/8th mile you could be turning off some mid 11s in the 1/4.
Ben T.
The quality of the work is more important than the casting number.
00Freak, don't get too caught up on dyno numbers. Based of your 1/8th mile you could be turning off some mid 11s in the 1/4.
Ben T.
Originally Posted by Studytime
A local in my area made 400rwhp through a 3200 Vigilante with a TR224 and mildly cleaned up 1998 heads with 2.02/1.57" valves. Take that for what you want.
The quality of the work is more important than the casting number.
00Freak, don't get too caught up on dyno numbers. Based of your 1/8th mile you could be turning off some mid 11s in the 1/4.
Ben T.
The quality of the work is more important than the casting number.
00Freak, don't get too caught up on dyno numbers. Based of your 1/8th mile you could be turning off some mid 11s in the 1/4.
Ben T.
john
On The Tree
Joined: Mar 2005
Posts: 176
Likes: 0
Originally Posted by Studytime
There WILL NOT be a notable difference between a 853/241 head when both are ported. So, anyone that posts good numbers with ported 241s, you could expect something in that neighborhood if your heads have a good port job on them.
Ben T.
Ben T.
I have a few sets of ported 853 & 241 castings with the PRC new 2.5 program run through them. If anyone is looking for a cheap option on stock serial # castings shoot me a pm!
__________________
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com