what heads are best??
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Junior Member
Joined: Jun 2010
Posts: 10
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Car: 87 iroc-z
Engine: B2L
Transmission: 700-R4
Axle/Gears: 3:27
what heads are best??
i got an 88 iroc B2L i got a flowmaster exhaustmsd 6al jegs distributer accel cap and rotor i self ported and nife edged the plenum runners and base bbk 52mm throttle body and 24lb injectors k&n drop ins and hallowed cat blah blah i was thinkin a set of L31s would be a bad *** set of heads sence there saposed to be the best flowing stock gm head ever built from what ive herd but i wanna get a second opion b4 i go junk yard shoppin for a pair to re do. i wanna know what head would kick the most *** on my car? im not lookin to spend 9000 on a set of after market heads lol i want stock gm bad *** **** plus i dont make good money now and i really wanna spank my buds 87 lx runing 13.28 best so let me know what ya think thanks
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Joined: Oct 2004
Posts: 965
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From: SE, Ohio
Car: '86 Z28, '91 RS
Engine: 305ci, 305ci
Transmission: TH200c (no kidding), TH700r4
Axle/Gears: 2.73, 2.73
Re: what heads are best??
i got an 88 iroc B2L .
i got a flowmaster exhaustmsd 6al, jegs distributer, accel cap, and rotor.
i self ported and nife edged the plenum, runners, and base.
bbk 52mm throttle body and 24lb injectors k&n drop ins and hallowed cat blah blah
i was thinkin a set of L31s would be a bad *** set of heads sence there saposed to be the best flowing stock gm head ever built from what ive herd but i wanna get a second opion b4 i go junk yard shoppin for a pair to re do.
i wanna know what head would kick the most *** on my car?
im not lookin to spend 9000 on a set of after market heads lol
i want stock gm bad *** **** plus i dont make good money now and i really wanna spank my buds 87 lx runing 13.28 best so let me know what ya think thanks
i got a flowmaster exhaustmsd 6al, jegs distributer, accel cap, and rotor.
i self ported and nife edged the plenum, runners, and base.
bbk 52mm throttle body and 24lb injectors k&n drop ins and hallowed cat blah blah
i was thinkin a set of L31s would be a bad *** set of heads sence there saposed to be the best flowing stock gm head ever built from what ive herd but i wanna get a second opion b4 i go junk yard shoppin for a pair to re do.
i wanna know what head would kick the most *** on my car?
im not lookin to spend 9000 on a set of after market heads lol
i want stock gm bad *** **** plus i dont make good money now and i really wanna spank my buds 87 lx runing 13.28 best so let me know what ya think thanks
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Joined: Oct 2008
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From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
Engine: several
Transmission: none
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Re: what heads are best??
For running a 13.28 from a B2l, the Vortec heads will get you there, but will require you to change the lower intake manifold. Plus used heads may need a trip to the machine shop, and after all that, you'd be worse off, both results and money, than if you just go buy a set of these: http://www.competitionproducts.com/P...fo/223400080A/ and add a set of these: http://www.competitionproducts.com/S...ductinfo/8440/
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From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
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Re: what heads are best??
1 piece construction, less weight, much better flow, less wear, better heat management.
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Joined: Jun 2002
Posts: 1,296
Likes: 6
From: Vancouver, WA
Car: 87 IROC-Z28
Engine: 305 TPI-New 355 on the engine stand
Transmission: T56
Axle/Gears: 3.73 Eaton posi-Soon a 9" Ford!
Re: what heads are best??
I already have a set of votrec's from scoggings dickey, but I found these on ebay the other day. Not sure of the quality, but the yare vortecs and a great price.
http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT
http://www.cgmmotorsports.com/sbcalu...ortecrace.aspx
http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT
http://www.cgmmotorsports.com/sbcalu...ortecrace.aspx
Last edited by alloy; Jul 15, 2010 at 02:21 AM.
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From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
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Re: what heads are best??
Those CGM heads are crap. The low-lift intake flow is far short of what it should be, and the exhaust flow is extremely poor in the mid and upper lifts. Plus the upper-lift intake flow is about right for a 1.94"-valved 170cc port, not a 200 cc 2.02"-valved port. These may actually be worse than GM's own "Fast-Burn" heads.
Joined: Dec 2005
Posts: 6,499
Likes: 31
From: Macon, GA
Car: 1992 Camaro RS
Engine: Vortec headed 355, xe262
Transmission: T56
Axle/Gears: 9-bolt 3.70
Re: what heads are best??
Those CGM heads are crap. The low-lift intake flow is far short of what it should be, and the exhaust flow is extremely poor in the mid and upper lifts. Plus the upper-lift intake flow is about right for a 1.94"-valved 170cc port, not a 200 cc 2.02"-valved port. These may actually be worse than GM's own "Fast-Burn" heads.
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From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
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Re: what heads are best??
Consider that Edelbrock's E-Tec 200 heads were developed because of the fast burn heads. Edelbrock found 10% more intake flow with 10cc smaller intake ports. Exhaust flow improved 17%.
Comparing fast burn versus truck Vortec, the high lift flow isn't any better, either. Let's look at mid-lift: The FB is 173 cfm, versus the truck's 190. Up at a realistic 0.475", the truck is 239 cfm, versus the fast burn at under 230.
Less flow from larger ports and valves is bull droppings.
And unless you're well over 400 cubes, you'd do better with 180cc heads anyway.
Comparing fast burn versus truck Vortec, the high lift flow isn't any better, either. Let's look at mid-lift: The FB is 173 cfm, versus the truck's 190. Up at a realistic 0.475", the truck is 239 cfm, versus the fast burn at under 230.
Less flow from larger ports and valves is bull droppings.
And unless you're well over 400 cubes, you'd do better with 180cc heads anyway.
Thread Starter
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Joined: Jun 2010
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Car: 87 iroc-z
Engine: B2L
Transmission: 700-R4
Axle/Gears: 3:27
Re: what heads are best??
soo your sayin the votec is the head to use?? cuz i know i gotta switch bases and herd from meny ppl that eldelbrocks the one who makes that base and it flows likE **** so yea lol i need to do something to this car quick and ina hurry i just got back from the track and ran a 15.10 best!!! 
im pissed!!! i dont have injectors or throttle body actuly on it yet but i do need to switch out injectors bad its got the originals from 87!!!! but besides wantin to put an LT4 hot cam in it i wanna know about the heads are the L98 vette alum. heads worth my time?? 
im pissed!!! i dont have injectors or throttle body actuly on it yet but i do need to switch out injectors bad its got the originals from 87!!!! but besides wantin to put an LT4 hot cam in it i wanna know about the heads are the L98 vette alum. heads worth my time?? Joined: Dec 2005
Posts: 6,499
Likes: 31
From: Macon, GA
Car: 1992 Camaro RS
Engine: Vortec headed 355, xe262
Transmission: T56
Axle/Gears: 9-bolt 3.70
Re: what heads are best??
If you've got the vette heads in it I'd just leave em alone. You'll make more power with Vortecs, but not a massive amount more. I almost want to trade my vortecs for some vette heads just so I can take 50 lbs off the car.
Regardless, you can get into the 12s with those heads if you put a big cam in it. Cam gearing, and stall should get you there I would bet.
Regardless, you can get into the 12s with those heads if you put a big cam in it. Cam gearing, and stall should get you there I would bet.
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From: Northern Utah
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Re: what heads are best??
It's easier to port the vette heads to big flow, but there's nothing wrong with the Edelbrock base. It does benefit from Extrude-Honing, but so would your current heads and intake base.
Joined: Jun 2002
Posts: 1,296
Likes: 6
From: Vancouver, WA
Car: 87 IROC-Z28
Engine: 305 TPI-New 355 on the engine stand
Transmission: T56
Axle/Gears: 3.73 Eaton posi-Soon a 9" Ford!
Re: what heads are best??
Would it be worth extrude honing the edelbrock base for a stock set of vortec heads?
Edit: At $435 for honing it's out of my price range anyway. I'd be better off selling my new manifold and going with a stealth ram instead. Unfortunately it won't clear my STB.
Edit: At $435 for honing it's out of my price range anyway. I'd be better off selling my new manifold and going with a stealth ram instead. Unfortunately it won't clear my STB.
Last edited by alloy; Jul 17, 2010 at 04:26 PM.
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Posts: 6,319
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From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
Engine: several
Transmission: none
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Re: what heads are best??
STBs are way overrated. It's just unnecessary weight, which is bad, up high, also bad, and relatively far forward in the car, also bad. Sell it to some ignoramus. I've seen full-competition-only third gens pull 1.2gs lateral without one. No stress cracks after a dozen seasons, either. That's more than enough evidence.
Joined: Jun 2002
Posts: 1,296
Likes: 6
From: Vancouver, WA
Car: 87 IROC-Z28
Engine: 305 TPI-New 355 on the engine stand
Transmission: T56
Axle/Gears: 3.73 Eaton posi-Soon a 9" Ford!
Re: what heads are best??
I understand what your saying. In my case I think the STB did make a difference. I definately could feel the difference with race tires on. Car seems more responsive and predictable in turns. My car is set up for autocrossing and track days.
Besides I now have holes in my strut towers and I'd rather leave the bar on to cover the holes.
Besides I now have holes in my strut towers and I'd rather leave the bar on to cover the holes.
Joined: Jun 2002
Posts: 1,296
Likes: 6
From: Vancouver, WA
Car: 87 IROC-Z28
Engine: 305 TPI-New 355 on the engine stand
Transmission: T56
Axle/Gears: 3.73 Eaton posi-Soon a 9" Ford!
Re: what heads are best??
Yes there is. Unfortunately it won't work with my vortec heads.
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From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
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Re: what heads are best??
Actually, it's easier to adapt it to Vortec heads than to L98 heads, but with the right reworking, it has even been adapted to those. If you want power for cheap, and keep the STB, it's your only option. Because the TPiS Mini-Ram is far overpriced.
Joined: Jun 2002
Posts: 1,296
Likes: 6
From: Vancouver, WA
Car: 87 IROC-Z28
Engine: 305 TPI-New 355 on the engine stand
Transmission: T56
Axle/Gears: 3.73 Eaton posi-Soon a 9" Ford!
Re: what heads are best??
I've checked into the TPIS mini ram and yes, out of my price range.
I'd not seen that the LT1 intake could be adapted for wortec use. I'll check into that.
Thanks
I'd not seen that the LT1 intake could be adapted for wortec use. I'll check into that.
Thanks
Thread Starter
Junior Member
Joined: Jun 2010
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Car: 87 iroc-z
Engine: B2L
Transmission: 700-R4
Axle/Gears: 3:27
Re: what heads are best??
i dont have the aluminum L98 vette heads i got the big 194;150 heavy cast heads i wanna know if getten a set of the vettes is worth my time and money keep in mind i wanna go 12s with hott stock **** not 16g in aftermarket **** soo yea
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