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LS1 / LS2
GPI – LS1 Heads
From: $1,095.00
- Our 243CC LS1 / LS2 Cathedral Port Cylinder Head was developed specifically for the stock displacement LS engine to deliver improved cylinder fill in the lower RPM ranges while adding substantial airflow increase in the upper Ranges as well.
- Our testing has shown over 30 hp increase while improving torque below the curve.
Want to learn why GPI makes the best performing Cylinder Heads you can buy!
GPI R&D PROCESSFrequently Purchased Together
Varies Based on Options
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Description
Track tested, Dyno proven cylinder head package.
Our 243CC LS1 / LS2 Cathedral Port Cylinder Head was developed specifically for the stock displacement LS engine. They deliver improved cylinder fill in the lower RPM ranges while adding substantial airflow increase in the upper Ranges as well. Our testing has shown over 30 hp increase while improving torque below the curve.
GPI has a long reputation for setting records at the track. Track results never lie!
OEM Casting ported and chambered –Â with valves less springs.
| Lift | Â Intake Flow @ 28″ | Â Exhaust Flow @ 28″ w no pipe | |
| .300 | 223 | 155 | |
| .400 | 268 | 206 | |
| .500 | 290 | 230 | |
| .600 | 295 | 241 | |
| .700 | 306 | 242 | |
| .800 | 310 | 243 |
Questions & Answers (12)
Customer questions & answers
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I just put your ss4 nfc na cam in my ls2 corvette and I’m looking to get my heads ported is there a certain cc I should do?
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Q I just put your ss4 nfc na cam in my ls2 corvette and I’m looking to get my heads ported is there...... Read more answer nowAsked by on October 13, 2023 9:40 pmA Email us at [email protected] so we can better assist you. SS4 is too much cam for a ls2 application
I currently have your ported 243 ported heads, t- upgrade, your BTR .660 valve train upgrade kit, 7.400 pushrods 5/16 On my 6.0. I am running right around 7 psi through a 1900TVS Blower. My question is, is this the best set up for street/pulls and street driving ?.?
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Q I currently have your ported 243 ported heads, t- upgrade, your BTR .660 valve train upgrade kit,...... Read more answer nowAsked by on December 24, 2022 10:01 amA I don't see it being an issue
I have a 05 c6 z51 6pd. I'm doing a btr stage 3 cam kit with the double springs, titanium clips, push rods etc. Fast 102, 1-7/8 headers 3" exhaust all the way back. the cam is spec for super charging which will be down the road. What porting would you recommend and approx. cost to do so to get the most out of my heads? Thanks!
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Q I have a 05 c6 z51 6pd. I'm doing a btr stage 3 cam kit with the double springs, titanium clips, ...... Read more answer nowAsked by on March 16, 2022 3:15 pmA We have one standardized port that we use and porting is 1095
I have a stock ls1 I want to get these with a 60cc chamber for more comp. I will probably also purchase a stage 3 n/a cam. What size pushrods would I need and will I have ptv problems? Thank you
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Q I have a stock ls1 I want to get these with a 60cc chamber for more comp. I will probably also pu...... Read more answer nowAsked by on November 17, 2021 11:23 amA You'll need to measure for piston to valve clearance with that cam after the milling and for every 1cc removed its .006 off the head so if we remove 6cc's you'll need .036 shorter pushrod from 7.425 so depending on which lifter you have will determine how much preload you'll be able to run as well.
I'm wanting to order a set of your ls1/ls2 heads in 62cc or 64cc for a stock short block LQ4 with a Texas speed ms4 cam. Will they work with this set up as far as valve clearance etc. Thank you
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Q I'm wanting to order a set of your ls1/ls2 heads in 62cc or 64cc for a stock short block LQ4 with...... Read more answer nowAsked by on June 17, 2021 11:05 amA You'll need to check the piston to valve clearance
Hi Vinnie Bono recommended you for heads,
I’ve got a gen 4 5.3 with stage 2 high lift cam 212/218 600 lift, trunnion upgraded rockers, hardened push rods and ls7 lifters already and I’m looking to upgrade my heads. Can I run a 58cc chamber on this setup safely with no ptv clearance issues and do you use bigger vlaves or just do the porting and I reuse the stock valves? I’m trying to get higher compression as as I won’t be boosting this bottom end anytime soon so I’d like the most performance I can get.
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Q Hi Vinnie Bono recommended you for heads, I’ve got a gen 4 5.3 with stage 2 high lift cam 212/218...... Read more answer nowAsked by on March 20, 2021 5:55 amA I think your going to be very close, and could possibly need to flycut. We would reused the factory or replace them with factory valves
My LS1 heads are casting 806 and are perimeter bold but i want to buy these heads with center bolt since i am converting. Will my stock LS1 heads be ok for core credit?
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Q My LS1 heads are casting 806 and are perimeter bold but i want to buy these heads with center bol...... Read more answer nowAsked by on October 23, 2020 7:59 pmA unfortunately we are not take the 806's as cores
I'd like to purchase these 243s would i have to send back 243s aswell or could I send in my 706 or 241 heads?
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Q I'd like to purchase these 243s would i have to send back 243s aswell or could I send in my 706 o...... Read more answer nowAsked by on September 9, 2020 4:38 amA Unfortunately we can only take the 243/799 castings for the core return. Thank you for asking.
Hi I own a company in NJ an I looking for 706 heads to get rebuilt with some mild up grades
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Q Hi I own a company in NJ an I looking for 706 heads to get rebuilt with some mild up grades answer nowAsked by on March 24, 2020 9:35 amAnswered by the admin
We can definitely port, mill, and assemble the heads for you. If you own a performance shop - feel free to fill out our dealer application. If you have any other questions about the heads - email us at sup[email protected] or give us a call at (501) 985-4947.
I want to upgrade my heads on 02 LM7. have stage 2 cam, will these heads be a good choice? what else would you suggest replacing while I have the engine tore down. Motor is in Jeep Wrangler!
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Q I want to upgrade my heads on 02 LM7. have stage 2 cam, will these heads be a good choice? what e...... Read more answer nowAsked by on December 1, 2019 7:54 amAnswered by the admin
These are a great option for your LM7, I would look into an upgraded lifter and maybe some lifter trays. Inspect your rocker arms, maybe add a trunion upgrade to them if they have a lot of miles. Look for excessive wear. Fortunately, these engines are very durable.
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Head are beautiful, well built. In the process of installing this week.
Received product in what looks to be excellent condition…took a bit of time to receive them but it is what it is… Haven’t installed the heads as of yet