Extrude Hone
Thread Starter
Burning Brakes
Joined: Feb 2010
Posts: 1,013
Likes: 2
From: California City Ca
Extrude Hone
Ok I still trying to figure out a way to get around Calif somg laws ya so much fun
The main problem is with my 1986 vett is the intake manifold I was thinking getting it Extrude Hone so it flow more CFM's and still have the stock look so it will still pass smog.
I need your input do you think this will work to get more flow so i can use better heads and still pass smog.
The main problem is with my 1986 vett is the intake manifold I was thinking getting it Extrude Hone so it flow more CFM's and still have the stock look so it will still pass smog.
I need your input do you think this will work to get more flow so i can use better heads and still pass smog.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Though extrude hone of the base would help, you would need LT runners, like the AS&Ms, to really help flow.
As an altenative to the "stock look", I've done the siamese intake base:
-cut a hole 2" deep x 1" high into the adjacent base runners
-cut about 1/4" deep x 1" high into the lower runner base to blend with the base openings
-smooth and stream-line the openings in base & runners
-open up the lower funner gaskets to match the new openings
This mod will increase breathing at top RPM while not taking away an appreciable amount on the low end:
Before: 185chp @5,600rpm
After: 215chp @5,600rpm
BTW, with this mod, 1.6:1 RRs, 160deg T-stat, open air cleaner lid, hi-flow cat, cut-back spark plugs she easily passed the OH E-Check dyno sniffer.
As an altenative to the "stock look", I've done the siamese intake base:
-cut a hole 2" deep x 1" high into the adjacent base runners
-cut about 1/4" deep x 1" high into the lower runner base to blend with the base openings
-smooth and stream-line the openings in base & runners
-open up the lower funner gaskets to match the new openings
This mod will increase breathing at top RPM while not taking away an appreciable amount on the low end:
Before: 185chp @5,600rpm
After: 215chp @5,600rpm
BTW, with this mod, 1.6:1 RRs, 160deg T-stat, open air cleaner lid, hi-flow cat, cut-back spark plugs she easily passed the OH E-Check dyno sniffer.
Thread Starter
Burning Brakes
Joined: Feb 2010
Posts: 1,013
Likes: 2
From: California City Ca
Thread Starter
Burning Brakes
Joined: Feb 2010
Posts: 1,013
Likes: 2
From: California City Ca
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
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
Thread Starter
Burning Brakes
Joined: Feb 2010
Posts: 1,013
Likes: 2
From: California City Ca
I think I going to go with getting the OEM stuff honed out
It seems like the SR is more for high rever I not looking for that.
I looking for a motor that turn 5000 to 5200 RPM's.
Its looking like Hone the intake and runners a a set of Trick flow heards will get the motor what I want it to do for now
It seems like the SR is more for high rever I not looking for that.
I looking for a motor that turn 5000 to 5200 RPM's.
Its looking like Hone the intake and runners a a set of Trick flow heards will get the motor what I want it to do for now
Last edited by Marv02; Feb 23, 2010 at 05:53 PM.
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
You can port the base plenty, sniffer cant pick that up. We actually have lenient sniffer standards out here. If your car is in good tune and you pass the visual you have no problem.
If it was me just porting the heads, intake aftermarket runners and a small cam/tune would make for a fun street legal car.
Did a 305 to 350 conversion on a freinds IROC last year. Edelbrock heads that got some porting, a Lunati 236Voodoo cam, ported TPI system nd shorty headers, car runs syper strong. Even with a rich mail order tune it easily passes Ca smog.
If it was me just porting the heads, intake aftermarket runners and a small cam/tune would make for a fun street legal car.
Did a 305 to 350 conversion on a freinds IROC last year. Edelbrock heads that got some porting, a Lunati 236Voodoo cam, ported TPI system nd shorty headers, car runs syper strong. Even with a rich mail order tune it easily passes Ca smog.
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
You can port the base plenty, sniffer cant pick that up. We actually have lenient sniffer standards out here. If your car is in good tune and you pass the visual you have no problem.
If it was me just porting the heads, intake aftermarket runners and a small cam/tune would make for a fun street legal car.
If it was me just porting the heads, intake aftermarket runners and a small cam/tune would make for a fun street legal car.
Le Mans Master
Joined: Mar 2002
Posts: 5,889
Likes: 2
From: Castro Valley Calif.
St. Jude Donor '03 thru '26
Marvin, extrude honing is gonna cost you $800 plus shipping both ways. You can do a decent SR for that money & have a unit that will out perform the stock extrude honed intake hands down. Then you can sell the TPI stuff & get a few bucks back.......I think you'd be way ahead of the game going that route.
Another thing.........cubic inches don't affect smog compliance, so perhaps think 383 because that would be like a 350 on steroids (all other parts being equal). Add a decent set of heads (nothing too expensive), a 219 cam, and you'd have a car in California that would be perfectly legal and kick some butt. I applaud you for working towards the best of both worlds; performance and legality
I bet you'll want more within a year, so put some forged pistons in while you're at it
Another thing.........cubic inches don't affect smog compliance, so perhaps think 383 because that would be like a 350 on steroids (all other parts being equal). Add a decent set of heads (nothing too expensive), a 219 cam, and you'd have a car in California that would be perfectly legal and kick some butt. I applaud you for working towards the best of both worlds; performance and legality
I bet you'll want more within a year, so put some forged pistons in while you're at it
Burning Brakes
Joined: Oct 2005
Posts: 824
Likes: 30
From: San Pablo California
Burning Brakes
Joined: Oct 2005
Posts: 824
Likes: 30
From: San Pablo California
Marvin, extrude honing is gonna cost you $800 plus shipping both ways. You can do a decent SR for that money & have a unit that will out perform the stock extrude honed intake hands down. Then you can sell the TPI stuff & get a few bucks back.......I think you'd be way ahead of the game going that route.
Another thing.........cubic inches don't affect smog compliance, so perhaps think 383 because that would be like a 350 on steroids (all other parts being equal). Add a decent set of heads (nothing too expensive), a 219 cam, and you'd have a car in California that would be perfectly legal and kick some butt. I applaud you for working towards the best of both worlds; performance and legality
I bet you'll want more within a year, so put some forged pistons in while you're at it
Another thing.........cubic inches don't affect smog compliance, so perhaps think 383 because that would be like a 350 on steroids (all other parts being equal). Add a decent set of heads (nothing too expensive), a 219 cam, and you'd have a car in California that would be perfectly legal and kick some butt. I applaud you for working towards the best of both worlds; performance and legality
I bet you'll want more within a year, so put some forged pistons in while you're at it