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TPI 2.8L/3.4L to Carburator

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TPI 2.8L/3.4L to Carburator

Old 10-15-2018, 05:29 PM
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TPI 2.8L/3.4L to Carburator

1987 Firebird 2.8L V6

Several years ago and about 17,000 miles, I replaced the 2.8L (173cid) short block with a stroked 3.4L (207 cid) from A.R.I in Kansas City (direct swap for 2.8L). At that time, I had the heads rebuilt, installed a Crane Street Performer cam, roller rockers, double roller cam chain, reduction pulleys, B&M transmission kit. Ran great until the fuel injection problems hit.

This summer I converted my 3.4L TPI to a Carburetor. The car runs like never before. Stomp on the line, and burn 'em down. Stomp at 20MPH, and she starts spinning those Goodyears. Second and third gear shifts chirp. WOT lays you back in the seat nicely.

With all the changes I have made, I am guessing right at 190HP, but have not dynod yet. if anyone is interested, I have documented the changes I made here:

https://gmv6-tpi-to-carb.com

Last edited by tmeyer; 10-17-2018 at 06:57 PM.
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Old 10-16-2018, 10:36 AM
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Re: TPI 2.8L/3.4L to Carburator

have any videos?
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Old 10-16-2018, 10:41 AM
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Re: TPI 2.8L/3.4L to Carburator

I had a 3.4 built by ARI too , but I didn't see an option for a stroked engine. Did you get this custom ordered?
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Old 10-16-2018, 02:22 PM
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Re: TPI 2.8L/3.4L to Carburator

Maybe I'll get some done next spring.
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Old 10-16-2018, 02:26 PM
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Re: TPI 2.8L/3.4L to Carburator

If you look at their web site, http://www.engine-parts.com/GMV6/gm2834stkr.html
Pro-Builder GM 2.8L Stroker Engine
Available in 3.1L and 3.4L Displacements
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Old 10-16-2018, 10:39 PM
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Re: TPI 2.8L/3.4L to Carburator

Sweeeeeeeeeeet.
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Old 10-17-2018, 04:13 PM
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Re: TPI 2.8L/3.4L to Carburator

Originally Posted by tmeyer View Post
If you look at their web site, http://www.engine-parts.com/GMV6/gm2834stkr.html
Pro-Builder GM 2.8L Stroker Engine
Available in 3.1L and 3.4L Displacements
yes that's what i ordered. but their 2.8l stroker is a 2.8 bored and stroked to stock 3.4 cubic inches, which is 207, not 210. that's why I was asking.
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Old 10-17-2018, 04:17 PM
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Re: TPI 2.8L/3.4L to Carburator

a post on fullthrottle v6 says technically it is 204.8in. I'm not trying to be smart, just wondering if you had it over-bored or not.
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Old 10-17-2018, 06:58 PM
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Re: TPI 2.8L/3.4L to Carburator

My bad, 207
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Old 10-18-2018, 09:39 AM
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Re: TPI 2.8L/3.4L to Carburator

you 've don'e what I almost did a while back. I had megasquirt put on my car but the intake manifold for MPFI just doesn't flow well. I only dyno'd 110 whp and 160 ft lbs STD corrected on a dynocom dyno.
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Old 10-18-2018, 11:14 AM
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Re: TPI 2.8L/3.4L to Carburator

If you got 110, you lost power. All I can say is my engine now has way more power and is more responsive than before. It's not even close. If you read the write up, I not only put a carb on, I changed intake, ignition, cam, roller rockers, reduction pulleys, cat back and used a carb matched to the size of the engine.
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Old 10-18-2018, 11:17 AM
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Re: TPI 2.8L/3.4L to Carburator

Nothing special, just their advertised 3.4L short block, which according to their spec sheet is 207cid.
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Old 10-18-2018, 11:20 AM
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Re: TPI 2.8L/3.4L to Carburator

My memory was off, I should have said 207 CID, I did the swap many years ago.. I just looked up on my paper work from ARI, and it is listed at 207CID.
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Old 10-19-2018, 10:56 AM
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Re: TPI 2.8L/3.4L to Carburator

Yes I had a comp 260h cam, 1.6 roller tip rockers , and pacesetter headers with no cat. idk how I dynod 110.
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Old 10-19-2018, 11:38 AM
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Re: TPI 2.8L/3.4L to Carburator

Originally Posted by WhiskeySierra6 View Post
Yes I had a comp 260h cam, 1.6 roller tip rockers , and pacesetter headers with no cat. idk how I dynod 110.
How did that happen. Stock is 140hp ?
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Old 10-24-2018, 07:06 AM
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Re: TPI 2.8L/3.4L to Carburator

Originally Posted by maroe624 View Post
How did that happen. Stock is 140hp ?
If you consider a loss through the worn drivetrain, plus only guessing what the engine was making at the flywheel, it's entirely possible that 110 is correct. Especially if there was no tune, or an improper tune. People almost always over estimate what their dyno numbers are, and then are disappointed or cant understand why they only dynoed XXXhp.
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Old 10-24-2018, 08:59 AM
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Re: TPI 2.8L/3.4L to Carburator

Yes dr. dave. however, my car was dynotuned with megasquirt ii. I believe I might have had a misfire going on, and my old muffler was probably clogged. But it did make a good torque number.
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Old 11-11-2018, 02:27 PM
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Re: TPI 2.8L/3.4L to Carburator

Originally Posted by tmeyer View Post
1987 Firebird 2.8L V6

Several years ago and about 17,000 miles, I replaced the 2.8L (173cid) short block with a stroked 3.4L (207 cid) from A.R.I in Kansas City (direct swap for 2.8L). At that time, I had the heads rebuilt, installed a Crane Street Performer cam, roller rockers, double roller cam chain, reduction pulleys, B&M transmission kit. Ran great until the fuel injection problems hit.

This summer I converted my 3.4L TPI to a Carburetor. The car runs like never before. Stomp on the line, and burn 'em down. Stomp at 20MPH, and she starts spinning those Goodyears. Second and third gear shifts chirp. WOT lays you back in the seat nicely.

With all the changes I have made, I am guessing right at 190HP, but have not dynod yet. if anyone is interested, I have documented the changes I made here:

https://gmv6-tpi-to-carb.com
hi so i see you installed a edelbrock intake manifold i got one too and the ports on one side where smaller than the other
did you have any problems with that ?
is there a stroker crankshaft for the 3.4 available?
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Old 11-13-2018, 03:08 PM
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Re: TPI 2.8L/3.4L to Carburator

Originally Posted by luca View Post
hi so i see you installed a edelbrock intake manifold i got one too and the ports on one side where smaller than the other
did you have any problems with that ?
is there a stroker crankshaft for the 3.4 available?
camshafts work regardless of the crankshaft. no real such thing as a stroker camshaft. and there are plenty of cams available for these engines.
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Old 11-14-2018, 10:14 AM
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Re: TPI 2.8L/3.4L to Carburator

Originally Posted by luca View Post
hi so i see you installed a edelbrock intake manifold i got one too and the ports on one side where smaller than the other
did you have any problems with that ?
is there a stroker crankshaft for the 3.4 available?
Ports were the same. Sure you got the correct base and top?
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