195 heads
Thread Starter
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
195 heads
im curious as to the most N/A HP anyone has made with a set of 195 heads. i know the LT4 heads are 195 castings and people have made well over 500 crank HP with those heads when they are completely ported but by that point they usually end up well over 210cc by the time they flow close to 300cfm intake. the highest i have seen is the motor that TPIS built with an off the shelf cam and a set of competition AFR 195 eliminators which flow 301 intake out of the box. they put it in a NA 396 lt1 with only a 58mm TB, 30lb injectors and 1 3/4" primary headers with only minimal intake porting. the peak was reached at about 6200rpms or so and was 552 crank HP. anyone make better numbers with 195 heads? perhaps with a more wildly ported intake or something? any input is welcome.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
You can make more than 550 but it will take an agressive solid roller, some compression and plenty of rpm. QUestion is would you want to street drive it when youre done....if you can even get the power to the ground.
Thread Starter
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
While I agree with you for the most part, i was simply curious what the power limits are of heads this size. regardless of it is considered "streetable" or not.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Drifting
Joined: Oct 2005
Posts: 1,916
Likes: 48
From: Angier nc
I will guess 600hp would be near the upper limits.It would take better than stock internals,lots of compression,cam duration,and have a narrower power band(like 4000-7000rpm)most likely.
Just guesses on my part so fire away if you disagree.
Just guesses on my part so fire away if you disagree.
Thread Starter
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
600 hp takes a lot to get there with a 350 and reliability will be a concern. Build bigger if you can, as the powerband goes up to acheive HP you will kill low speed torque and drivability. With more CI it makes a 525-550chp build much more tractable to drive and tune.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Race Director
Joined: May 2003
Posts: 10,749
Likes: 41
First off what kind of cubes are we talking? Big difference between a 355 LTx, and a stroked 409 LTx.
The most of have personally seen is in the area of 495rwhp in an LTx, and those LT4 heads were ported to chit, and it reved to 7000 rpm's if not a tad more. This was a 398 if memory serves me.
Here is a 409 LTx that I stumbled on:
http://www.strokerengine.com/DynoTPI.html
The most of have personally seen is in the area of 495rwhp in an LTx, and those LT4 heads were ported to chit, and it reved to 7000 rpm's if not a tad more. This was a 398 if memory serves me.
Here is a 409 LTx that I stumbled on:
http://www.strokerengine.com/DynoTPI.html
Thread Starter
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
First off what kind of cubes are we talking? Big difference between a 355 LTx, and a stroked 409 LTx.
The most of have personally seen is in the area of 495rwhp in an LTx, and those LT4 heads were ported to chit, and it reved to 7000 rpm's if not a tad more. This was a 398 if memory serves me.
Here is a 409 LTx that I stumbled on:
http://www.strokerengine.com/DynoTPI.html
The most of have personally seen is in the area of 495rwhp in an LTx, and those LT4 heads were ported to chit, and it reved to 7000 rpm's if not a tad more. This was a 398 if memory serves me.
Here is a 409 LTx that I stumbled on:
http://www.strokerengine.com/DynoTPI.html
Le Mans Master
Joined: Oct 2007
Posts: 9,682
Likes: 3,433
From: Akron Ohio
2025 Corvette of the Year Finalist - Modified
2024 C5 of the Year Winner - Modified
2023 C5 of the Year Finalist - Modified
2022 C5 of the Year Finalist - Modified
St. Jude Donor '09-'10-'11
First off what kind of cubes are we talking? Big difference between a 355 LTx, and a stroked 409 LTx.
The most of have personally seen is in the area of 495rwhp in an LTx, and those LT4 heads were ported to chit, and it reved to 7000 rpm's if not a tad more. This was a 398 if memory serves me.
Here is a 409 LTx that I stumbled on:
http://www.strokerengine.com/DynoTPI.html
The most of have personally seen is in the area of 495rwhp in an LTx, and those LT4 heads were ported to chit, and it reved to 7000 rpm's if not a tad more. This was a 398 if memory serves me.
Here is a 409 LTx that I stumbled on:
http://www.strokerengine.com/DynoTPI.html
Safety Car
Joined: Sep 2001
Posts: 4,155
Likes: 553
From: Glenbeulah Wi
im curious as to the most N/A HP anyone has made with a set of 195 heads. i know the LT4 heads are 195 castings and people have made well over 500 crank HP with those heads when they are completely ported but by that point they usually end up well over 210cc by the time they flow close to 300cfm intake. the highest i have seen is the motor that TPIS built with an off the shelf cam and a set of competition AFR 195 eliminators which flow 301 intake out of the box. they put it in a NA 396 lt1 with only a 58mm TB, 30lb injectors and 1 3/4" primary headers with only minimal intake porting. the peak was reached at about 6200rpms or so and was 552 crank HP. anyone make better numbers with 195 heads? perhaps with a more wildly ported intake or something? any input is welcome.
A side note 210cc or 220CC heads on a large cubic inch SBC do not feel lazy at low RPM. My 406 with 218cc heads can break the tires loose at low rpm rolling into the gas in second gear.
exhaust cant keep up anyway