Intake manifold upgrade worth it?
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Junior Member
Joined: Oct 2015
Posts: 29
Likes: 0
From: Philadelphia, PA
Car: 1988 Camaro Iroc-Z
Engine: 350 TBI
Transmission: 700R4
Axle/Gears: 3.73
Intake manifold upgrade worth it?
I have a completely stock 350 SBC at the moment. Currently I don't have a lot of money to spend on parts, and I have to replace my brake booster and TPS. I was contemplating on upgrading my intake manifold, but unsure if the upgrade would even be worth the money. I was looking at the Summit carb manifolds since the TBI are so expensive. I know I'll need to shell out extra for the adapter, but really can't find any information on any gains from upgrading the stock manifold.
Member
Joined: Jan 2011
Posts: 446
Likes: 1
From: Saratoga Area, New York
Car: 1990 Formula Firebird
Engine: 305 TBI (LO3)
Transmission: WC T-5 out of an 88 T/A
Axle/Gears: 10 bolt, 3.42 & Torsen Posi
Re: Intake manifold upgrade worth it?
If you have a truck engine I don't think an intake alone is going to get you much bang for your buck, the cam is shitty for a car & the heads are shitty period. You really want to replace the heads, cam & intake at the same time so they all match.
Joined: Apr 2004
Posts: 3,001
Likes: 62
From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
Re: Intake manifold upgrade worth it?
Honestly you won't gain much with just an intake swap. If you are keeping the stock swirls then just try to find a used RPM intake with an adapter.
Joined: Jan 2005
Posts: 10,426
Likes: 497
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Intake manifold upgrade worth it?
I had a very noticeable power gain with both a Performer RPM and Weiland 7525 when I had a nearly stock 1-ton 350 long block. Stock heads/Stock cam/ 1.6:1 full roller rockers and Doug Thornley Tri-Y headers.
Joined: Jan 2005
Posts: 10,426
Likes: 497
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Intake manifold upgrade worth it?
Heads are NOT the problem. Far bigger restrictions in other places.
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