Ported 243 or Aftermarket??
Thread Starter
Launching!
Joined: Jan 2016
Posts: 224
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Ported 243 or Aftermarket?? I have a 00 WS6, 228/232 .610 .600 cam, PB level 2 trans and FTI 3600 billet stall....Currently running the stock 241 heads with BTR double 660 springs....I found a deal on some stock 243 heads from a friend for $250...he just pulled them off his ctsv after messing his cam up..The heads are unmolested so far...I could prob get tsp to port them still have less than 1k in the heads...How would a P/P 243 head compare to afr , prc or trick flow heads? Im sure all 3 of them would be a huge gain over my stock 241 for sure...but if I can have 1k in ported 243 over 1800-2k on the after market and still get close to the same results I would be good with that...I could use the left over $$ for other upgrades....My goal is only to run mid 11 in the car.....whats your thoughts on the head choice??
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
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From: Central Cal.
You are right. Have TSP do either a Stage I (uses OEM 2.00" valves) for $750 plus any springs needed (use what you have), or a Stage 2.5 (uses 2.02" valves) for about $1000. If you check flow #'s, there is VERY LITTLE difference in flow between the two stages. Bang for the buck, Stage I wins, IMHO.
Thread Starter
Launching!
Joined: Jan 2016
Posts: 224
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Thanks guys! Just picked them up for $225...Will def be sending them to TSP to get worked over...I just installed a Performabuilt Level 2 trans with a FTI 9.5 Billet 3600 stall, and about to order a Strange 12 bolt...I don't think my 10 bolt is gonna last very long with the mods..also picked up a LS6 intake from him for $300...Been a good day on getting parts! Also bought the Speed Engineering true dual exhaust for her a while back that Im gonna put on as well....I think she should hit mid 11 with those changes. Have never made a pass with the MT Drag radials yet, just street tires and it was blowing them off so never got a decent pass in
TECH Junkie
Joined: Nov 2013
Posts: 3,913
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From: White Bear, Mn
Lot of people still running the 10 bolt in there auto car including myself. 3.73's and 1.5x 60's here in mine
TECH Veteran
Joined: Sep 2014
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From: Mississippi
Car on board here running your same exact cam with a similar stall but using tfs as cast 220s. Car puts down 445rwhp on a stingy mustang dyno...
Otherwise with suspension work and weight reduction LOW 11s is at the finger tips.
Otherwise with suspension work and weight reduction LOW 11s is at the finger tips.
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Launching!
Joined: Jan 2016
Posts: 224
Likes: 1
I just couldn't pass up the deal on those heads...Im gonna put the MT drag radials on and make a few passes, then get the heads, intake and exhaust installed and compare the changes....Im running SE 1 7/8 long tubes and ORY but still have the flowdiaster muffler on it...Heard the flowmaster was horrible on flow so hopefully the SE true duals will help it breath a little better...And yea, trying to save a litte $$ to spend on other supporting mods in suspension...I cant see paying 2k for heads when I can have half that in a set of ported 243 and still flow about the same as aftermarket...Just trying to be smart about spending funds is all....When I switched the trans and stall out it felt like a whole diff car...I just had the stock trans with big ol 11" fti 2800 stall...now with the PB level 2 and 9.5 3600 stall it felt like it lost 500 pounds....Thanks for all the info, its much appreciated! I will post the time from next weekend at the track, and then post again after all the new stuff goes on
On The Tree
Joined: Jan 2016
Posts: 181
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From: Indianapolis, Indiana
The only drawback to the TSP stage one porting is that they use your existing valves. If there is any wear on the stem it stays there. They told me they don't machine the tops at all.
Flow numbers are really easy to check. Everyone lists flow numbers on their website.
I just got my LS1 heads back this morning from another vendor that I thought offered a better package. They look like brand new. Gotta love it!!
Also, you should just send in your 241 heads. Once ported, there isn't a difference from the 243 heads.
Flow numbers are really easy to check. Everyone lists flow numbers on their website.
I just got my LS1 heads back this morning from another vendor that I thought offered a better package. They look like brand new. Gotta love it!!
Also, you should just send in your 241 heads. Once ported, there isn't a difference from the 243 heads.
On The Tree
Joined: Jan 2016
Posts: 181
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From: Indianapolis, Indiana
Used 241's have near zero value. Used 243's have at least a $225 value. On the plus side, you can send the 243's in now, and not start the exchange until you get them back. It is a few weeks turnaround.
On the other hand, just taking the used 243 castings in for a good 5 angle valve job would give him flow numbers flirting with a 20% improvement over the 241. Add in .030 milling job and all of a sudden you have a worthwhile mod.
On the other hand, just taking the used 243 castings in for a good 5 angle valve job would give him flow numbers flirting with a 20% improvement over the 241. Add in .030 milling job and all of a sudden you have a worthwhile mod.
Even though TSP provides a good product, I would consider checking out TEA or Advanced Induction as well. I went with AI 226cc 243's and have been really impressed. Made great power and Phil is very helpful. Good luck.
What are you concerned with? The early V1 Caddies have the LS6 motor. As in hollow valve stems and LS6 springs. Those heads flow 270 or so and are about 10.9 CR. The 241s flow at about 220. The LS2 243s flow about 250 and have 10.5 CR, along with solid stainless valves and weaker springs.
You may want to consider Cometic .040 HGs to increase CR and tighten the quench height to increase squish and add further power. Otherwise you are good to go and will enjoy the difference.
You may want to consider Cometic .040 HGs to increase CR and tighten the quench height to increase squish and add further power. Otherwise you are good to go and will enjoy the difference.
Last edited by rednari2; Dec 11, 2017 at 07:36 PM.
What are you concerned with? The early V1 Caddies have the LS6 motor. As in hollow valve stems and LS6 springs. Those heads flow 270 or so and are about 10.9 CR. The 241s flow at about 220. The LS2 243s flow about 250 and have 10.5 CR, along with solid stainless valves and weaker springs.
You may want to consider Cometic .040 HGs to increase CR and tighten the quench height to increase squish and add further power. Otherwise you are good to go and will enjoy the difference.
You may want to consider Cometic .040 HGs to increase CR and tighten the quench height to increase squish and add further power. Otherwise you are good to go and will enjoy the difference.
11 Second Club
Joined: Dec 2016
Posts: 665
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241 heads 66.67 cc chamber volume CR 10:1:1 intake port 200cc Exhaust port 70cc
243 heads 64.45cc chamber volume CR 10:5:1 intake port 220cc exhaust port 75 cc.
The 243 shortens burn time and uses less ignition timing advance to produce the same power, less timing allows a more efficient combustion, the 243 produces more torque, the d shaped exhaust port improves flow. Milling the deck .030 will yield an approximate CR of about 11:1:1 on an LS1 engine. So ported and milled, ya they are better than a ported 241 will ever be, do it.
243 heads 64.45cc chamber volume CR 10:5:1 intake port 220cc exhaust port 75 cc.
The 243 shortens burn time and uses less ignition timing advance to produce the same power, less timing allows a more efficient combustion, the 243 produces more torque, the d shaped exhaust port improves flow. Milling the deck .030 will yield an approximate CR of about 11:1:1 on an LS1 engine. So ported and milled, ya they are better than a ported 241 will ever be, do it.
241 heads 66.67 cc chamber volume CR 10:1:1 intake port 200cc Exhaust port 70cc
243 heads 64.45cc chamber volume CR 10:5:1 intake port 220cc exhaust port 75 cc.
The 243 shortens burn time and uses less ignition timing advance to produce the same power, less timing allows a more efficient combustion, the 243 produces more torque, the d shaped exhaust port improves flow. Milling the deck .030 will yield an approximate CR of about 11:1:1 on an LS1 engine. So ported and milled, ya they are better than a ported 241 will ever be, do it.
243 heads 64.45cc chamber volume CR 10:5:1 intake port 220cc exhaust port 75 cc.
The 243 shortens burn time and uses less ignition timing advance to produce the same power, less timing allows a more efficient combustion, the 243 produces more torque, the d shaped exhaust port improves flow. Milling the deck .030 will yield an approximate CR of about 11:1:1 on an LS1 engine. So ported and milled, ya they are better than a ported 241 will ever be, do it.
Weird, the people who have done it have forgotten about 243's since they make more power than most people do with ported 243/799's. A simple google search will show you that. I'm not saying a 243/799 is a bad head, but saying a 241 head is **** is just flat out retarded, Phil proved that.