ported 241s or 243s?
TSP goes the extra mile on their products (especially packaging, condition of the product before shipping, polite customer service), where SDPC doesn't - and it reflects in the final product. If you are willing to live with discount bin products and poor service due to budgetary constraints you will do fine with SDPC; but, if you want quality you are going to have to pay for it.
I am just providing my insight based on personal experience.
Ironically, the next time I order new GM parts I will do so from Summit (who will price match SDPC) and they will have the parts drop shipped in from SDPC (confirmed with an LS6 valley cover) anyway - but at least Summit's customer service is sound. I doubt I will ever deal directly with SDPC again for so many reasons.
I am just providing my insight based on personal experience.
Ironically, the next time I order new GM parts I will do so from Summit (who will price match SDPC) and they will have the parts drop shipped in from SDPC (confirmed with an LS6 valley cover) anyway - but at least Summit's customer service is sound. I doubt I will ever deal directly with SDPC again for so many reasons.
Our heads are very well known to be one of the best you can get for the money, and for good reason. We deal parts from the best manufacturers in the LS world and we also deal proven budget conscious parts and both equally receive some of the best customer service you'll find in the industry. We try to always go the extra mile to get the customer the best products at the best prices and the service every customer deserves and we will continue to do so.
Again, I'm sorry that your particular situation was not ideal. We would like all transactions to go smoothly from start to finish and we apologize dearly that we could not meet your needs. We went above and beyond to try to make the situation right in your eyes, including a 100% refund when it came to light that we could not properly satisfy you.
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From: Wilmington, De
I ordered from SDPC one time before and didn't have an issue. The guy on the phone even informed me of a product that wasn't on their site, or was very hard to find on their site, and it wound up being the very product I needed.
If those ported 243s from SDPC are going to be $1100 for two assembled heads, I would go that route. You'll spend a grand on having your 241s ported easily.
If those ported 243s from SDPC are going to be $1100 for two assembled heads, I would go that route. You'll spend a grand on having your 241s ported easily.
whichever heads you buy find out what springs they come with. i only have ls6 springs and wish i had better. from what i read equal porting job the 243's are about 20 cfm better flow. i think my tsp stage 1's were 307 cfm at 600 intake & aprox 215 cfm exhaust. goodluck!
I ordered from SDPC one time before and didn't have an issue. The guy on the phone even informed me of a product that wasn't on their site, or was very hard to find on their site, and it wound up being the very product I needed.
If those ported 243s from SDPC are going to be $1100 for two assembled heads, I would go that route. You'll spend a grand on having your 241s ported easily.
If those ported 243s from SDPC are going to be $1100 for two assembled heads, I would go that route. You'll spend a grand on having your 241s ported easily.
Probably because they are a big company and get crazy deals on 243 castings because they move so much product. How is it that certain sponsors on here can sell the exact same product for a **** ton less money; because they are bigger and move more products than the other company that doesn't get as good of a deal. Anytime you buy in bulk, you get a better deal, which in turn, allows you to sell the product for less than the competitor does.
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From: Marengo, Ia
It probably also helps that they are probably CNC machined in a large production run, reducing change over time, instead of machining one set of customer supplied heads at a time with only a handful of the same castings each time.
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Verdad Gallardo I've never once done business with them, so not being partial at all. It's simple supply and demand and overall business knowledge. Why can Wal-Mart sell everything for cheaper than smaller businesses? Because they buy in the largest bulk and get the best deals for doing so.
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Joined: Aug 2011
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Likes: 6
From: Marengo, Ia
I've never once done business with them, so not being partial at all. It's simple supply and demand and overall business knowledge. Why can Wal-Mart sell everything for cheaper than smaller businesses? Because they buy in the largest bulk and get the best deals for doing so.
Do they actually sell a lot? I don't recall seeing a lot of guys running them?
CNC is what I do and you would be amazed how important workmanship is. Even same machine, same material same program.
CNC is what I do and you would be amazed how important workmanship is. Even same machine, same material same program.
Just because you don't see them on LS1tech doesn't mean a lot of people don't run them. I'd say a very small percentage of LSx guys are on here. I know Ed Curtis' cnc'd heads sell pretty well, but you rarely see people posting up about them on here. I wish SDPC would weigh in. I'm interested in how many they sell as well.
I have been googling for results with the SDPC heads for over an hour using various terms and most of what I find is old (like 2005 and older) and not worth mentioning. Assuming these are the same as the GMPP ls6 heads I've still found very little solid information. I just can't seem to find useful before after dyno or track results.
One thing that seems to come up is that they have really good low-mid lift numbers but several flow tests I found show close to .600 they go turbulent which would make them a great head for lower lift cams but modern high lift grinds might suffer some.
Honestly, if I could find some solid third party testing done recently (it seems these heads might have had production changes over the years) I would be strongly considering ordering a pair next month since I was looking to spend several hundred bucks freshening up my hand ported 799s with more port work...if I could instead sell them and put that money towards the SDPC heads I would only be out a little more for potentially better heads.
One thing that seems to come up is that they have really good low-mid lift numbers but several flow tests I found show close to .600 they go turbulent which would make them a great head for lower lift cams but modern high lift grinds might suffer some.
Honestly, if I could find some solid third party testing done recently (it seems these heads might have had production changes over the years) I would be strongly considering ordering a pair next month since I was looking to spend several hundred bucks freshening up my hand ported 799s with more port work...if I could instead sell them and put that money towards the SDPC heads I would only be out a little more for potentially better heads.
Searched results can be hard to find simply because of the vast number of terms they can be found under. LS2, LS6, 243, 799, CNC, ported etc. We sell very many sets of these heads and have very satisfied customers with them.
How we keep them priced so low is a combination of factors on the business end of things. Also keep in mind when supply makes it possible we offer two variations of our ported heads. We offer a less expensive program using quality refurbished heads from GM, as well as a program using new heads from GM that do cost a bit more. Both are priced quite competitively in the market. Our website always specifies if the heads are refurbished.
All recent runs of heads have been on 799 castings rather than 243 castings.
I ran these heads on my C5. 346ci, 10.9 compression, 238/247 cam, and it made 471rwhp through 4.11s on our dynojet. It had 1 3/4 Kooks, and a ported FAST 90mm intake.
I have them on my Trailblazer SS as well but it has not been dyno'd.
How we keep them priced so low is a combination of factors on the business end of things. Also keep in mind when supply makes it possible we offer two variations of our ported heads. We offer a less expensive program using quality refurbished heads from GM, as well as a program using new heads from GM that do cost a bit more. Both are priced quite competitively in the market. Our website always specifies if the heads are refurbished.
All recent runs of heads have been on 799 castings rather than 243 castings.
I ran these heads on my C5. 346ci, 10.9 compression, 238/247 cam, and it made 471rwhp through 4.11s on our dynojet. It had 1 3/4 Kooks, and a ported FAST 90mm intake.
I have them on my Trailblazer SS as well but it has not been dyno'd.
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These are for the heads we keep in stock. They have stock size valves in them and they are 64cc chambers.
• Lift Intake Flow Exhaust Flow
• .200" 147 cfm 115 cfm
• .300" 204 cfm 148 cfm
• .400" 251 cfm 189 cfm
• .500" 289 cfm 200 cfm
• .600" 307 cfm 220 cfm
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Intake flow numbers are usually with a radius fixture and those exhaust numbers are most likely without a pipe....I'm guessing they'ld be around 242-244 w/1.875" by 8" long.
For the record, seems the OP fell off planet earth.....
For the record, seems the OP fell off planet earth.....