853 vs ported 243s
Thread Starter
Joined: Mar 2011
Posts: 1,194
Likes: 0
From: Southeast Missouri
853 vs ported 243s Right now I have stock 853 heads with a btr stage 4 cam.. So a large cam. I run 7.2 @94 on average in the 1/8th mile.. What should I expect if I went to ported 243s in et gain and hp gain?
Texas Speed stage 1 costs $750. If you don't have the 243 heads you can always get your 853's ported. I still have the stock cam and the ported 243's were an improvement on the street. I'm not sure how much hp I gained but the car is definitely more fun to drive.
I think Advanced Induction has one of the best overall 853/241 ported cylinder heads. They says a 346cid LS1's can manage 440-470rwhp with their welded up high compression 852/241 heads. They also say that their best ported 243/799/LS6 head are capable of with most LS1 & LS2's producing 450-500rwhp.
Based on supporting mods the properly ported 243/799/LS6 head is probably worth 10 hp to 30 hp over the the best ported 853/241. Most ported 853/241 heads are not welded to boost compression. The average ported 853/241 isn't going to make 440 to 470whp.
There is a lot of interesting reading here...
http://www.advancedinduction.com/LSX...rHeads.php#241
Based on supporting mods the properly ported 243/799/LS6 head is probably worth 10 hp to 30 hp over the the best ported 853/241. Most ported 853/241 heads are not welded to boost compression. The average ported 853/241 isn't going to make 440 to 470whp.
There is a lot of interesting reading here...
http://www.advancedinduction.com/LSX...rHeads.php#241
Trending Topics
I did a bunch of research on heads over the past year. Basically, TEA and AI probably have the best heads, but also the most expensive. Texas Speed is probably the best bang for the buck. I decided to go with Frankenstein because their price is right in the middle, and flow numbers are close to AI and TEA, but with a smaller intake runner. I'm saving up now to get the Frankenstein work done to my 243's this spring.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
Joined: Mar 2011
Posts: 1,194
Likes: 0
From: Southeast Missouri
Thanks for the info guys. I have a NX kit I have waiting to put on but I wanted to try and hit 6s N/A honestly. I think for the cheap price of 243s I wouldn't waste the time porting my 853 heads. I just saw some 243s for sale on a Facebook group yesterday for $200 a set, guy had a few. Of course they were taken quick though but deals are out there.
I agree. Quality ported 243s will allow that big cam to breathe much better plus would offer the ability to literally increase the compression ratio a full point or so between a thinner head gasket and a slight mill or just milling assuming adequate PTV. Going from factory 243s to ported 243s is one thing but going from factory 853s to ported 243s is another. I would absolutely do it.
Thread Starter
Joined: Mar 2011
Posts: 1,194
Likes: 0
From: Southeast Missouri
I agree. Quality ported 243s will allow that big cam to breathe much better plus would offer the ability to literally increase the compression ratio a full point or so between a thinner head gasket and a slight mill or just milling assuming adequate PTV. Going from factory 243s to ported 243s is one thing but going from factory 853s to ported 243s is another. I would absolutely do it.
The shop I had my work done is a AI vendor, I was going to spend a little bit more on the 243's but they told me the 241 HCR heads are very close in numbers and these guys have done a ton of them. I would say stick w/ your stock heads, you might be surprised what you get out of them.
The shop I had my work done is a AI vendor, I was going to spend a little bit more on the 243's but they told me the 241 HCR heads are very close in numbers and these guys have done a ton of them. I would say stick w/ your stock heads, you might be surprised what you get out of them.
Last edited by StealthFormula; Nov 9, 2017 at 08:43 AM.
FWIW - In my last build, I ran a BTR stg 4 cam and 799's ported by TEA and milled .015". I don't recall what the PTV was other than the exhaust was greater than 0.090" and the intake even more. I sold the car and the combo has been running (and racing) for a couple years now. Ironically I am putting a different combo together over this winter, with a smaller cam and home ported 853's.