L98 TPI Rebuild + tune up
Thread Starter
Banned
Joined: Jan 2008
Posts: 547
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From: Europe->Poland->Warsaw
Car: 1988 Pontiac Firebird
Engine: 305 LT1 intake&heads
Transmission: TH700r4
Axle/Gears: 3.73 10bolt GM
L98 TPI Rebuild + tune up
Hello
I'm rebuilding my nearly dead 350 TPI (Firebird Formula '88 350 TPI - 220HP 330 Torque) . I want to use only new parts so that my engine will live for another couple of years. My target is to make 300-350 HP street car.
What I already ordered are:
stroker kit to 383:
http://cgi.ebay.com/ebaymotors/Eagle...em120046839941
heads (+parts):
http://store.summitracing.com/partde...part=EDL-60859
http://store.summitracing.com/partde...t=ARP-134-3701
http://store.summitracing.com/partde...?part=EDL-7204
http://store.summitracing.com/partde...t=NAL-10159409
http://store.summitracing.com/partde...?part=EDL-7310
http://store.summitracing.com/partde...?part=EDL-9629
http://store.summitracing.com/partde...t=FEL-VS50088R
oil pump:
http://store.summitracing.com/partde...5&autoview=sku
fuel pressuere regulator:
http://store.summitracing.com/partde...5&autoview=sku
I was wondering if this cam will fit:
http://cgi.ebay.com/ebaymotors/NEW-S...QQcmdZViewItem
and which rocker arms, lifters, pushrods, timing chain (and gear set), ballancer, cam bearings should i buy?? (summit or ebay links are
)
Is there any part will i need and forgot to order ??
Please help because I'm from Poland and it takes a while to get parts from US to Europe.
Best regards
WASyL
I'm rebuilding my nearly dead 350 TPI (Firebird Formula '88 350 TPI - 220HP 330 Torque) . I want to use only new parts so that my engine will live for another couple of years. My target is to make 300-350 HP street car.
What I already ordered are:
stroker kit to 383:
http://cgi.ebay.com/ebaymotors/Eagle...em120046839941
heads (+parts):
http://store.summitracing.com/partde...part=EDL-60859
http://store.summitracing.com/partde...t=ARP-134-3701
http://store.summitracing.com/partde...?part=EDL-7204
http://store.summitracing.com/partde...t=NAL-10159409
http://store.summitracing.com/partde...?part=EDL-7310
http://store.summitracing.com/partde...?part=EDL-9629
http://store.summitracing.com/partde...t=FEL-VS50088R
oil pump:
http://store.summitracing.com/partde...5&autoview=sku
fuel pressuere regulator:
http://store.summitracing.com/partde...5&autoview=sku
I was wondering if this cam will fit:
http://cgi.ebay.com/ebaymotors/NEW-S...QQcmdZViewItem
and which rocker arms, lifters, pushrods, timing chain (and gear set), ballancer, cam bearings should i buy?? (summit or ebay links are
)Is there any part will i need and forgot to order ??
Please help because I'm from Poland and it takes a while to get parts from US to Europe.
Best regards
WASyL
Last edited by WASyL; Jan 21, 2008 at 05:59 AM.
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From: St. Louis, Missouri
Car: 1989 Firebird Formula
Engine: 383 Stealth Ram
Transmission: 700R4
Axle/Gears: 3.73 9 bolt Posi
Re: L98 TPI Rebuild + tune up
The ZZ4 cam will fit and is a great cam for a 350 TPI. But, since you are building a 383, I would go with something bigger.
Supreme Member
Joined: Jun 2005
Posts: 1,440
Likes: 2
From: huntsville, al
Car: 89 IROC
Engine: 6.8 HSR N2O
Transmission: TKO 600
Axle/Gears: 9" Moser 3.50 True trac
Re: L98 TPI Rebuild + tune up
First of all let me say that your 383 decision is a good one. I went through my L98 a couple years back and spent more having my stock crank and rods reconditioned with new pistions. I just freshened up the bottom end a few months ago and couldn't see replacing all that. It's sort of a catch 22.
Now I'm going to be the devil's advocate and bring up a touchy subject. I noticed you didn't have a intake change on your list. My experiance with the 350 is the LTR TPI is a restriction. On a 383 it's gonna be worse. I think you'll have a tire smokin setup that'll run out of air at 4500+. I would definatly recommend a HSR or other simular intake. Of coures, you could add it later if you wish and I think you'll want it.
You were asking about the cam and what you do in the future is a factor. If you cam it for the LTR then it may not be best for the HSR. I'm running 212/218 and it was perfect for the 350 with the TPI. It's really too small for the 350/HSR and would be waaay to small for a 383/HSR. Sorry to open up this subject but it's one worth considering. I would never go back to the LTR, even aftermarket ones.
Hope this helps -my .02.
Now I'm going to be the devil's advocate and bring up a touchy subject. I noticed you didn't have a intake change on your list. My experiance with the 350 is the LTR TPI is a restriction. On a 383 it's gonna be worse. I think you'll have a tire smokin setup that'll run out of air at 4500+. I would definatly recommend a HSR or other simular intake. Of coures, you could add it later if you wish and I think you'll want it.
You were asking about the cam and what you do in the future is a factor. If you cam it for the LTR then it may not be best for the HSR. I'm running 212/218 and it was perfect for the 350 with the TPI. It's really too small for the 350/HSR and would be waaay to small for a 383/HSR. Sorry to open up this subject but it's one worth considering. I would never go back to the LTR, even aftermarket ones.
Hope this helps -my .02.
Thread Starter
Banned
Joined: Jan 2008
Posts: 547
Likes: 0
From: Europe->Poland->Warsaw
Car: 1988 Pontiac Firebird
Engine: 305 LT1 intake&heads
Transmission: TH700r4
Axle/Gears: 3.73 10bolt GM
Re: L98 TPI Rebuild + tune up
as for intake there are two option's:
- http://store.summitracing.com/partde...?part=EDL-3890 + http://store.summitracing.com/partde...rt=HLY-112-503
or
- HSR but I'm not sure if HSR will fit to my '88 engine and hood (i want to keep my oryginal formula look)
so as we know what kind of air delivery there will be can some one tell me which cam should i order ??
Best regards
WASyL
- http://store.summitracing.com/partde...?part=EDL-3890 + http://store.summitracing.com/partde...rt=HLY-112-503
or
- HSR but I'm not sure if HSR will fit to my '88 engine and hood (i want to keep my oryginal formula look)

so as we know what kind of air delivery there will be can some one tell me which cam should i order ??
Best regards
WASyL
Last edited by WASyL; Jan 22, 2008 at 08:53 AM.
Thread Starter
Banned
Joined: Jan 2008
Posts: 547
Likes: 0
From: Europe->Poland->Warsaw
Car: 1988 Pontiac Firebird
Engine: 305 LT1 intake&heads
Transmission: TH700r4
Axle/Gears: 3.73 10bolt GM
Re: L98 TPI Rebuild + tune up
so if zz4 is Lift: 208/221 Lift: .474"/.510" and is good only for 350 then maybe this one is ok for 383 http://store.summitracing.com/partde...CCA-SK08-422-8 ??
come on people you deal with V8 every day and here in poland it's hard to get some good info on those engines
Best regards
WASyL
come on people you deal with V8 every day and here in poland it's hard to get some good info on those engines
Best regards
WASyL
Supreme Member
Joined: Jun 2005
Posts: 1,440
Likes: 2
From: huntsville, al
Car: 89 IROC
Engine: 6.8 HSR N2O
Transmission: TKO 600
Axle/Gears: 9" Moser 3.50 True trac
Re: L98 TPI Rebuild + tune up
True, you have to be carefull with the Firebird's hood profile. Other's have said it will work but I have a Camaro and had to trim the underside bracing a bit. I still have the insulation under my hood and it has "witness" lines on it from the manifold. I'll defer to others with Firebirds on this one.
The last cam is a bit closer in my opinion. 220/230 + or -. 112 LCA. May end up wanting a mild stall for auto's and 3.20 + gearing.
The last cam is a bit closer in my opinion. 220/230 + or -. 112 LCA. May end up wanting a mild stall for auto's and 3.20 + gearing.
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Thread Starter
Banned
Joined: Jan 2008
Posts: 547
Likes: 0
From: Europe->Poland->Warsaw
Car: 1988 Pontiac Firebird
Engine: 305 LT1 intake&heads
Transmission: TH700r4
Axle/Gears: 3.73 10bolt GM
Re: L98 TPI Rebuild + tune up
this is why i prefferr to take edelbrock intake manifold with runners and holley throttles.
"The last cam is a bit closer in my opinion. 220/230" - you mean int/exh or just between 220-230 of int ??
best regards
WASyL
"The last cam is a bit closer in my opinion. 220/230" - you mean int/exh or just between 220-230 of int ??
best regards
WASyL
Supreme Member
Joined: Jun 2005
Posts: 1,440
Likes: 2
From: huntsville, al
Car: 89 IROC
Engine: 6.8 HSR N2O
Transmission: TKO 600
Axle/Gears: 9" Moser 3.50 True trac
Re: L98 TPI Rebuild + tune up
Around 220 intake and 230 exhaust with 112 LCA. And yes the Edelbrock is better than stock TPI in my opinion. No personal experiance though. You may want to look at;
www.stealthram.com
There's a lot of info regarding runner length, ID, flow potential etc. Maybe someone with LTR experiance will chime in here.
www.stealthram.com
There's a lot of info regarding runner length, ID, flow potential etc. Maybe someone with LTR experiance will chime in here.
Member
Joined: Jun 2005
Posts: 217
Likes: 0
From: Tucson, AZ
Car: 89 GTA
Engine: L98 350
Transmission: Swapped to a T-5
Axle/Gears: 3.27
Re: L98 TPI Rebuild + tune up
The ZZ4 cam the same cam I have in my car and got it from the same guys. However I would not get the cam from RPD because they sold me a defective cam and didn't take responsibility for it. So if you still want to get that cam don't get it from them.
Does Poland have strict emission laws?
Does Poland have strict emission laws?
Thread Starter
Banned
Joined: Jan 2008
Posts: 547
Likes: 0
From: Europe->Poland->Warsaw
Car: 1988 Pontiac Firebird
Engine: 305 LT1 intake&heads
Transmission: TH700r4
Axle/Gears: 3.73 10bolt GM
Re: L98 TPI Rebuild + tune up
Around 220 intake and 230 exhaust with 112 LCA. And yes the Edelbrock is better than stock TPI in my opinion. No personal experiance though. You may want to look at;
www.stealthram.com
There's a lot of info regarding runner length, ID, flow potential etc. Maybe someone with LTR experiance will chime in here.
www.stealthram.com
There's a lot of info regarding runner length, ID, flow potential etc. Maybe someone with LTR experiance will chime in here.
pzdr
----------
Does Poland have strict emission laws?
Last edited by WASyL; Jan 22, 2008 at 12:48 PM. Reason: Automerged Doublepost
Supreme Member
Joined: Jun 2005
Posts: 1,440
Likes: 2
From: huntsville, al
Car: 89 IROC
Engine: 6.8 HSR N2O
Transmission: TKO 600
Axle/Gears: 9" Moser 3.50 True trac
Re: L98 TPI Rebuild + tune up
LTR stands for "Long tube runner". The factory TPI, Edelbrock, SLP and TPIS Big Mouth are all Long tube runner, or LTR designs.
Hey and it's cool to hear a third gen refered to as an "exotic" car.
Hey and it's cool to hear a third gen refered to as an "exotic" car.
Thread Starter
Banned
Joined: Jan 2008
Posts: 547
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From: Europe->Poland->Warsaw
Car: 1988 Pontiac Firebird
Engine: 305 LT1 intake&heads
Transmission: TH700r4
Axle/Gears: 3.73 10bolt GM
Re: L98 TPI Rebuild + tune up
Supreme Member
Joined: Jun 2005
Posts: 1,440
Likes: 2
From: huntsville, al
Car: 89 IROC
Engine: 6.8 HSR N2O
Transmission: TKO 600
Axle/Gears: 9" Moser 3.50 True trac
Thread Starter
Banned
Joined: Jan 2008
Posts: 547
Likes: 0
From: Europe->Poland->Warsaw
Car: 1988 Pontiac Firebird
Engine: 305 LT1 intake&heads
Transmission: TH700r4
Axle/Gears: 3.73 10bolt GM
Thread Starter
Banned
Joined: Jan 2008
Posts: 547
Likes: 0
From: Europe->Poland->Warsaw
Car: 1988 Pontiac Firebird
Engine: 305 LT1 intake&heads
Transmission: TH700r4
Axle/Gears: 3.73 10bolt GM
Re: L98 TPI Rebuild + tune up
Ok what do you think about this set:
http://store.summitracing.com/partde...CCA-CL08-503-8
http://store.summitracing.com/partde...?part=CCA-2136
http://store.summitracing.com/partde...rt=CCA-1417-16
oh and one more thing, which balancer should i take??
best regards
WASyL
http://store.summitracing.com/partde...CCA-CL08-503-8
http://store.summitracing.com/partde...?part=CCA-2136
http://store.summitracing.com/partde...rt=CCA-1417-16
oh and one more thing, which balancer should i take??
best regards
WASyL
Supreme Member
Joined: Jun 2005
Posts: 1,440
Likes: 2
From: huntsville, al
Car: 89 IROC
Engine: 6.8 HSR N2O
Transmission: TKO 600
Axle/Gears: 9" Moser 3.50 True trac
Re: L98 TPI Rebuild + tune up
The Comp Cams XE 276/282 is the exact cam I would choose for 383/HSR for street/strip use. I'd also recommend a 3.27+ rear gear ratio. The other components look fine too.
As far as a balancer is concerned I'm using the stock one but would recommend and aftermarket one but I will defer to others who have experiance with them.
Good luck it looks like you're on the right track.
As far as a balancer is concerned I'm using the stock one but would recommend and aftermarket one but I will defer to others who have experiance with them.
Good luck it looks like you're on the right track.
Thread Starter
Banned
Joined: Jan 2008
Posts: 547
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From: Europe->Poland->Warsaw
Car: 1988 Pontiac Firebird
Engine: 305 LT1 intake&heads
Transmission: TH700r4
Axle/Gears: 3.73 10bolt GM
Re: L98 TPI Rebuild + tune up




, now i know that books i've read are not only letters that i put togeder 
I'd also recommend a 3.27+ rear gear ratio.
Best regards
WASyL
Supreme Member
Joined: Jun 2005
Posts: 1,440
Likes: 2
From: huntsville, al
Car: 89 IROC
Engine: 6.8 HSR N2O
Transmission: TKO 600
Axle/Gears: 9" Moser 3.50 True trac
Re: L98 TPI Rebuild + tune up
I am refering to the rear axel ratio. When I've made modifications to increase an engines horse power there's always a trade off. More horse power comes at the upper RPM ranges and therefore reduce low RPM power. So other things like transmission torque converter stall, rear end gear ratio and the like have to be considered. It's all part of a total package or combination.
Thread Starter
Banned
Joined: Jan 2008
Posts: 547
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From: Europe->Poland->Warsaw
Car: 1988 Pontiac Firebird
Engine: 305 LT1 intake&heads
Transmission: TH700r4
Axle/Gears: 3.73 10bolt GM
Re: L98 TPI Rebuild + tune up
ok, now i get it
i'm just focused on engine, after rebuilding whole engine i'll change stall, driveshaft and use new rear axle then i'll decide about rear gear ratio. as for gear box i have 700r4 fully rebuilded (only 1k miles done) with B&M transpak
Best regards
WASyL
i'm just focused on engine, after rebuilding whole engine i'll change stall, driveshaft and use new rear axle then i'll decide about rear gear ratio. as for gear box i have 700r4 fully rebuilded (only 1k miles done) with B&M transpakBest regards
WASyL
Supreme Member
Joined: Jul 1999
Posts: 2,149
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From: Mims, Florida
Car: '87 IROCZ
Engine: 395 ZZ4
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt 3.70s
Re: L98 TPI Rebuild + tune up
I think that the heads are way too small, only 160cc runners and the 60cc chambers on a 383 will send you fairly high for CR. I would get a set of heads with at least 195cc runners. Look at the Trick Flow, Patriot Performance or AFR.
And as stated above by others the cam is too small. I have a 395 with a 224/230 duration cam and that cam is too small for me. I would run at least my size cam in your 383.
And as stated above by others the cam is too small. I have a 395 with a 224/230 duration cam and that cam is too small for me. I would run at least my size cam in your 383.
Thread Starter
Banned
Joined: Jan 2008
Posts: 547
Likes: 0
From: Europe->Poland->Warsaw
Car: 1988 Pontiac Firebird
Engine: 305 LT1 intake&heads
Transmission: TH700r4
Axle/Gears: 3.73 10bolt GM
Re: L98 TPI Rebuild + tune up
And as stated above by others the cam is too small. I have a 395 with a 224/230 duration cam and that cam is too small for me. I would run at least my size cam in your 383.
so something more like this one ??
http://store.summitracing.com/partde...8&autoview=sku
best regards
WASyL
Re: L98 TPI Rebuild + tune up
You can't use the stock balancer on a 383 unless it has been internally balanced. You are using a different crank, so it will have a different balance. A 400 balancer is what is typically used.
immo
The ebay ad said it comes with one.
immo
The ebay ad said it comes with one.
Thread Starter
Banned
Joined: Jan 2008
Posts: 547
Likes: 0
From: Europe->Poland->Warsaw
Car: 1988 Pontiac Firebird
Engine: 305 LT1 intake&heads
Transmission: TH700r4
Axle/Gears: 3.73 10bolt GM
Re: L98 TPI Rebuild + tune up

best reagrads
WASyL
Thread Starter
Banned
Joined: Jan 2008
Posts: 547
Likes: 0
From: Europe->Poland->Warsaw
Car: 1988 Pontiac Firebird
Engine: 305 LT1 intake&heads
Transmission: TH700r4
Axle/Gears: 3.73 10bolt GM
Re: L98 TPI Rebuild + tune up
One another question is Weiand Stealth Ram equal to Holley Stealth Ram ??
best regards
WASyL
best regards
WASyL
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so
ant tell me wich cam rockers, lifters and timning chain with gears
