My friends got a 1996 GP with the 3.1 that im helping him with and we cant find headers for it, I read somewhere that you can mod some GA headers to fit?

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By wolfgtp at 2011-03-28
2000 Grand Prix GTP Bild

IIRC the downpipes are in different locations. I know the L67 swapped guys have used Speed Daddy's but with heavy cutting to the firewall and bending the headers. Your best bet is probably making some log manifolds.

...But what makes you think you need headers? Unless you're top-swapped, the intakes are the biggest bottlenecks on the 1G 3100's. I will be doing a 3400 swap and even then I will only be running either logs or PEM's.

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check out wot-tech.com they sell 1st gen w-body headers last i looked

-- Tue Aug 30, 2011 3:24 pm --

check out wot-tech.com they sell 1st gen w-body headers last i looked

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

the intakes are the biggest bottlenecks on the 1G 3100's. I will be doing a 3400 swap and even then I will only be running either logs or PEM's


isnt the 3500 intake a better flowing that the very similer 3100/3400 intakes? making a 3400 with a 3500 intake a decent combo?

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

Slap a cone on that bitch FTMFW

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All sho no go...

He's referring to the actual intake manifold. It is VERY restrictive from what I can remember. The early 3.4L were the same way (both were basically the same as the much earlier and smaller 2.8L IIRC). So a cone wouldn't help a bit.

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98 GTP (RIP 11-5-09); 73 Z28 Camaro (350, TKO 600);01 Monte Carlo SS (L36, L67/L32 hybrid in the future)
"Death smiles at us all; all a man can do is smile back"

Yep. Actually the 3500 heads may be a little better as well. I plan on doing a 3400 swap but may grab a 3500 top end to port out and install later.

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3500 heads stock flow more then ported 3400 heads.

stock the upper 3500 manifold flows less then the upper 3x00 manifold (the redesigned ones in 2000) but they can be ported more. the lower 3500 intake flows more then the 3400/3100

for stock this is the way to go 3x00 upper, 3500 lower, 3500 heads. when i had the 2.8L camaro i planned on making a RWD 3.4L hybrind witht he 3500 parts

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

i dont wanna sound like a noob but...how much hp do you think that'll net? like the 3x300 upper along with the 3500 lower and heads? i would guess around like 30-50 crank, and then with headers...thatd be a pretty solid gain.

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there are cars making over 300 wheel with a 3500 top end and a cam.

the 3500 heads raise compression a bit to around 10:1

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

wow that is alot better than i thought....im gonna look into this a bit more...

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I'm VERY tempted to grab an older GP just to try this out LOL

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98 GTP (RIP 11-5-09); 73 Z28 Camaro (350, TKO 600);01 Monte Carlo SS (L36, L67/L32 hybrid in the future)
"Death smiles at us all; all a man can do is smile back"

Stock 3500's make 200 at the crank. I don't see someone picking up over 100hp from just a cam.

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Block from a 3400 I think is what Tom meant. That's why he mentioned how it bumped the compression ratio up to 10:1

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98 GTP (RIP 11-5-09); 73 Z28 Camaro (350, TKO 600);01 Monte Carlo SS (L36, L67/L32 hybrid in the future)
"Death smiles at us all; all a man can do is smile back"

yup there is also a lot left on the table witht eh factory tuning

i also forgot to mention that is with it backed with a manual. an auto would be around 270-280 wheel power

i will try and find the thread of the 310whp cavi


also just for fun a 3.4L RWD block will gibe you 12:1 compretion with a 3500 top end and still be streetable with 93 pump gas do to how efficiant the head design is and if you have a cam that can evacuate the exhuast gasses quickly


here is the cam

114 lobe sep
113 intake centerline
225/212 durant @.050
.536/.52 valve lift

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

Tom that makes me want to pick up a 3.4L F-body and do exactly that. That could be VERY fun. Which injectors and fuel rail would you use? Or does it matter? I need to stop finding ideals for projects LOL.

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98 GTP (RIP 11-5-09); 73 Z28 Camaro (350, TKO 600);01 Monte Carlo SS (L36, L67/L32 hybrid in the future)
"Death smiles at us all; all a man can do is smile back"

fuel rail form a 3x00 a 3500 uses a returnless fuel system

and 39 or 42.5 injectors would be good for head room

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

Hmmm interesting. Once I have the money for another project I may pick up a 93-95 fbody to try this on...

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98 GTP (RIP 11-5-09); 73 Z28 Camaro (350, TKO 600);01 Monte Carlo SS (L36, L67/L32 hybrid in the future)
"Death smiles at us all; all a man can do is smile back"

or you could use the 3.4 RWD bock with 3400 pistons and then add a turbo

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

You'd have to replace the intake manifold to pull that off because it flows so terribly. The heads aren't as bad but to use the 3400 intake you need the 3400 heads which brings the compression up to ridiculous levels (if you don't change pistons) like it does with the 3500 top end. I don't think a turbo would be as effective with only changing the pistons.

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98 GTP (RIP 11-5-09); 73 Z28 Camaro (350, TKO 600);01 Monte Carlo SS (L36, L67/L32 hybrid in the future)
"Death smiles at us all; all a man can do is smile back"

i was talking about a 10:1 compretion set up with a 3500 top end and a turbo with 7psi the engine would scream

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

Oh ok gotcha. Yeah that would work. You didn't mention the 3500 top end. The 3.4 RWD heads aren't all that terrible, but they won't work with any other viable intake manifold. The only really bad part of that motor was the intake manifold. If you modify a 3.4L RWD block you're better off using the stock cam to be honest. If I ever get my hands on a 3.4L F-body I'll probably top swap it pretty damn quick just to see what I can do. Probably would stay N/A to start with.

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98 GTP (RIP 11-5-09); 73 Z28 Camaro (350, TKO 600);01 Monte Carlo SS (L36, L67/L32 hybrid in the future)
"Death smiles at us all; all a man can do is smile back"

yup the 3x00 is not a bad engine. technology wise they leave the 3800 in the dust the 3900 is a bored and stroked vertipon of the 3500 and that makes 250hp. it was the replacement to the L32 in the impalas

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

They do put out less torque and worse fuel mileage than the engines they replaced though (as well as less HP in the case of the 3900). High HP numbers are nice but I don't like to sacrifice a bunch of torque to get there. Seems like that's how most motors are headed these days though. Damn ricer craze....

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98 GTP (RIP 11-5-09); 73 Z28 Camaro (350, TKO 600);01 Monte Carlo SS (L36, L67/L32 hybrid in the future)
"Death smiles at us all; all a man can do is smile back"

the 3900 impalas are faster then the perviuse ones do to 50lbs less weight and diffrent transmission gearing

the tourqe is not that far off also remember they had the SS LS4 as well at the time for the fast car

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater