Has anyone used 187 heads on a L69 or other carbed engine ?
Thread Starter
Senior Member
Joined: May 2012
Posts: 582
Likes: 1
From: Woodstock, IL
Car: 1984 Trans Am Recaro Edition
Engine: 355 L98 Vortec 226/234 custom cam
Transmission: TKO-600
Axle/Gears: On borrowed time...
Has anyone used 187 heads on a L69 or other carbed engine ?
Wondering if anybody has any experience in this swap. My understanding is that the 187 heads were for TBI and TPI engines so I guess the intake for the L69 wouldn't fit.
If a 187 head is used on a L69, what intake manifold would be needed to work with a q-jet setup?
If a 187 head is used on a L69, what intake manifold would be needed to work with a q-jet setup?
Supreme Member
iTrader: (29)
Joined: Sep 1999
Posts: 1,410
Likes: 2
From: Location, Location!
Car: 92 T/A 'vert
Engine: Mild .040 over L98 4 bolt mains
Transmission: Mostly stock 700R4, 2600 Vigilante
Axle/Gears: LS1 3.42
Re: Has anyone used 187 heads on a L69 or other carbed engine ?
Those are swirl ports found only on TBI, not TPI, IIRC. In general, most people say their only automotive application is as ballast in the trunk. If you're hell bent on using them, the middle holes on your intake can be hogged out to fit the older style bolt pattern. Be advised, you'll also lose compression due to a larger chamber size.
Joined: Sep 2005
Posts: 27,881
Likes: 2,434
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Has anyone used 187 heads on a L69 or other carbed engine ?
Compression will be about the same.
You'll take about a 10 - 15% HP hit due to the extremely power-hostile design of those "swirlies".
Not sure in what universe this could possibly ever become A Good Idea.
You'll take about a 10 - 15% HP hit due to the extremely power-hostile design of those "swirlies".
Not sure in what universe this could possibly ever become A Good Idea.
Supreme Member
Joined: Jan 2009
Posts: 2,313
Likes: 115
From: belle fourche,s.d.
Car: '82 z28
Engine: L83 5.7
Transmission: 700r4-1985
Axle/Gears: 3.42 posi
Re: Has anyone used 187 heads on a L69 or other carbed engine ?
an'88 caprice LG4 i had had the 187s and a q-jet manifold-i don't know if '87 f-body LG4s were 187s/carb,but i'd guess they were.
Joined: Jan 2005
Posts: 10,407
Likes: 492
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Has anyone used 187 heads on a L69 or other carbed engine ?
One was in a boat and ran 5,000 rpm all day long.
Thread
Thread Starter
Forum
Replies
Last Post
84z96L31vortec
Tech / General Engine
7
Aug 20, 2017 12:16 AM
theshackle
Tech / General Engine
4
Mar 5, 2017 06:37 PM
