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

 

have any videos?

 

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?

 

Maybe I'll get some done next spring.

 

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

 

Sweeeeeeeeeeet.

 

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.

 

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.

 

My bad, 207

 

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.

 

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.

 

Nothing special, just their advertised 3.4L short block, which according to their spec sheet is 207cid.

 

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.

 

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 ?

 

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.

 

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.

 

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.

 

Ports were the same. Sure you got the correct base and top?