Porting exhaust manifolds
#1
Junior Member
Thread Starter
Join Date: Feb 2002
Location: Oregon
Posts: 50
Likes: 0
Received 1 Like
on
1 Post
Car: 1989 IROCZ
Engine: 305
Transmission: 5 spd
Axle/Gears: 3.45? G92 Option
Porting exhaust manifolds
Been gathering up parts to rebuild the engine in a 89 5spd IROC G92 optioned car. Going to keep it all stock numbers matching(am adding a 400 crank). Anybody ported the stock manifolds and seen any difference in performance. Not looking to make the car a killer but the hot rodder in me is still alive. Thanks
#2
Supreme Member
iTrader: (15)
Join Date: Oct 2003
Location: Charlestown, IN
Posts: 3,449
Likes: 0
Received 4 Likes
on
4 Posts
Car: 1971 Camaro
Engine: 427
Transmission: TKO600
Axle/Gears: 3.73
Re: Porting exhaust manifolds
I doubt you'll see any noticable gains. The manifolds are very poorly designed. If you have the time, it won't hurt, but again, I doubt you'd see any gain if you did a back to back dyno pull.
#5
Supreme Member
Join Date: Feb 2004
Location: So Cal
Posts: 1,581
Likes: 0
Received 2 Likes
on
2 Posts
Car: 89 IROC Z28
Engine: 357 TPI
Transmission: 700R4
Axle/Gears: 3.42 Posi
Re: Porting exhaust manifolds
I've been told that cars don't have anything like matching numbers anymore just the casting numbers. All cars with the same motor have the same number.
#7
Supreme Member
Join Date: Feb 2004
Location: So Cal
Posts: 1,581
Likes: 0
Received 2 Likes
on
2 Posts
Car: 89 IROC Z28
Engine: 357 TPI
Transmission: 700R4
Axle/Gears: 3.42 Posi
Re: Porting exhaust manifolds
I was just at Dyno Don's shop. He told me and I check for myself on the 3 or 4 motors he has on stands and believe me the only numbers on the blocks were the casting numbers from the mold and the engine size in liters. He showed me the location where the VIN used to be stamped and the are completely blank. Believe it or not.
Last edited by ringo234; 12-30-2012 at 07:33 PM.
Thread
Thread Starter
Forum
Replies
Last Post
Hotrodboba400
Firebirds for Sale
3
12-10-2019 07:07 PM
86CamaroDan
Engine/Drivetrain/Suspension Parts for Sale
2
09-29-2015 10:08 PM