How much of a power increase?
Thread Starter
Safety Car
Joined: Jul 2008
Posts: 3,966
Likes: 4
From: Made In America
St. Jude Donor '10-'11
How much of a power increase?
Need a straight answer. How much power can be gained from porting the stock: Base, plenum, and runners. Yes, I know SLPs have more meat and the stock ones don't have much so please can someone give me a hp increase by porting the stock pieces? No this is not, why don't you convert it to a LTx intake thread.
Pro
Joined: Feb 2009
Posts: 589
Likes: 1
From: PA
I agree. From all the things I read porting and polishing is such a small gain in HP, in my mind it's not worth the trouble.
I bought a book 3, 4 years ago called; How To Tune & Modify Chevrolet TPI Engines. Of course I forgot what I read, but I didn't do any of it. It's a good book and maybe you should get one for your answers.
I bought a book 3, 4 years ago called; How To Tune & Modify Chevrolet TPI Engines. Of course I forgot what I read, but I didn't do any of it. It's a good book and maybe you should get one for your answers.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
...so please can someone give me a hp increase by porting the stock pieces?
Pro
Joined: Jan 2008
Posts: 584
Likes: 1
From: Near Lockport NY Black 1986 Coupe
The base and plenum will not give nearly the amount of what a nice set of ported aftermarket runners could. If this was my project, I'd invest the money in the runners, and light base porting to match up. THAT I can see a nice 10rwhp jump, but not with the stockers.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
picked up 1.5 mph with a very mildly ported TPi base and a clean up at the entry of the plenum. Have done some much more agressive port jobs but havent gotten to see results yet. I would bet much more than 9-10hp