I have a 95' 4.3 Ltr FI engine that needs rebuilt,..what kind of power can U get from these engine's with factory ECU,..and spider FI system..?? Thanks

I'd think asking that question on a truck forum that the motor came from you'd get more answers. Can the ecu be chipped or reprogrammed ¿

Are you willing to change the pistons rods or heads?

$500 rebuild budget or 3 times that amount¿

it depends on what version you have.

you will need to look here to figure out what engine you have https://en.wikipedia.org/wiki/General_Motor...C2%B0_V6_engine

then with less accessories and less restrictive exhaust you might add 10-15% in hp

also note how low these engines make their power, these are designed for torque to be used in trucks.

My boat has the marine 4.3 it makes 205hp.

Just build it to GMC Syclone/Typhoon specs with a turbo for best power.

And then a really strong trans to handle the torque and hp - that'd be a monster in the right chassis!

Go to the S10 Forums. Lots of high performance goodies are available for that engine (check Summit and JEGS). You can easily get 260 HP. I had one in an S10 Blazer. The turbo'd aluminum block GNX version would be insane in a teener.

Gnx has the Buick 3.8


Not the same engine

Well dang. I thought the were based off the same block. My bad.

Yeah, totally different engine. The 3.8 is a V-6 that dates back to the 60's as a 90degree V-6. A very stout motor...... The 4.3 is derived from the 350 V-8 minus two cylinders. Low rev, high torque. IMO, the 3.8 used in the GNX is a much better motor, even NA. In its later years was roller rocker and lifters, very smooth great Fuel Economy and an easy 200K. One benefit of the 4.3 was the plug and play of Pistons, Connecting Rods, Lifters, Rockers, Bearings, Timing chain, valves from the 350.....

I'd love to get my hands on one of the old Buick or Olds all aluminum V-8's. I had one in an Opel GT project years ago........ Back then they were all over the place. Now, impossible to find.... Ah the good old days.

I would go with a 5.7L V8 and reap the benefit of cheaper parts and more power.

Here ya go.

Click to view attachment

Yea I know about the v8's,...but I have the 6 if I could build close to 300HP,..i would be happy with that, but I do want FI,....Otherwise its the subie EZ30R ...not sure what kinda pwr that can reach stk is 240 or so,..

Look again. That is a 6. 4.3 Chevy. Confident that it will be over 450HP

Click to view attachment

But how much did you spend on it?

Way too much but it sure is fun! I had the engine and thought it would be fun in a 1750lb. car

Might be fun and all but a V8 will make more power for less money.

So it all depends on your budget...

I think 300-350 HP is about right for a 914,..being I have the engine a supposed vortec at 200hp should'nt take much to get 250 275,..,..the subie engines are around 1500.00 plus all the ECU expense,..at near 2500.00 from outfront,..hell 4 k already,..and I
have all that already for 250.00 bucks

I do have another one that I broke the crank in. I have a set of the little Brody aluminum heads and it has a kickin little .600 cam. If you are interested, I would sell you some of the parts. It made 300 with just the heads and the cam.

Mike,..your car is 325 HP are u happy with that,..and with the handeling,..of course your set up is more than stk,..I know..

True, but it only weighs 300lbs dressed.

if I could only find a chevy 302..I could live with that

if I could only find a chevy 302..I could live with that,..Do a FI system,..But why cant I up the crank size,do some hd wk and B done,..Oh thanks for the link MESSIX,...

Find a 283 and put a 327 crank in it and you have a 302.

no

find a early 327 [small journal crank] and put a 283 crank in it, and then fin really small combustion chamber heads to get the compression up then you will have a cheap 302.

a real z28 dz302 is a large journal block and crank.


and the buick v6 was never offered in a production car with a aluminum block

that would be a 307..... really small bore/long stroke

I think if your going to do a custom built V-8 in a 914, a 383 SBC stroker is the way to go. 400 crank in a 350, and you have an easy 6000 rpm redline. A great motor overall. Of course you can build more into it, but this is a very easy build, and the only build I would do on a small block.

this motor would be so outside the nature of what a 914 would need.

a 914 doesn't need stump pulling torque that a stoked out 350 would have.

better builds would be a 283, 327 sbc

or a 4.8 5.3 ls gm v8 and there are hybrid builds to do from these engines also
you could take the crank and rods out of a 4.8 and use the pistons nad block from a ls1 [5.7] or a 6.0L block and have the short stoke and large bore to allow better breathing heads.

the mid '90s lt1 v8's could build a hybrid from the "mini" lt1 that was a 4.3 v8 using the crank and rods and transferring them to 350 one piece main seal block and pistons for a 302.

..........or go BIG

Click to view attachment

383 is a 400 crank in a 350 block. Heck a 283 with some small aluminum heads would be perfect.

Yea,...No...not going that big,..just want 300 ponies at the wheels and the ability to cruise,..8 hr hiway or a 3 hr blast thru the mountains,...V8 seems to be the cheapest easiest way to go,..my V6 can only punch out to about 250 HP I need 325 for 300 at the wheels,..I belive,...Or agin I go Subie,...,..the wife want to keep it stk,...but that's due to to much HP in such a car,..and I said,..Baby that's were the fun is,...!!!! Thanks For all the info,...Guys...

Yea, flip it. What he said

I had a 283 with iron heads. It was heavy and made a reliable 250hp. good heads and a bigger cam could make an easy 300hp.

the very small bore of the 283 presents valve shrouding challenges, finding a set of aftermarket "vortec" heads with small chambers to keep up the compression or milling the heads would solve this.

Ah, to each his own. A 383 stroker loves to rev, makes power a bit higher in the rev range without sacrificing the benefits of low end torque. At least the ones I built. Is a much more tractable motor, with solid progressive power. That was my thinking.

So I will now switch gears completely,...and ask about a 4.6 ford V8 in a 914 any experience with that motor,.?? anyone

FYI: Even being optimistic...you'll need 340-345 crank hp to achieve 300 at the wheels. Also, getting a small displacement engine that has good streetability (and more important - reliability) isn't a trivial pursuit. The Subies blow up often on the track...in Subies. It just isn't stupid easy, be careful and do your homework.

Tony

well now Iam thinking small blk ford 4.6 v8 will they fit in a 914

NO

I dont have the measurements off hand, but the Ford 4.6 is a very wide and tall motor, VERY unlikely it will fit.

Has anyone ever done the Fox Body 302 Ford in a 914? I'm not a Ford man, but this is a widely available and easily built motor

A few pictures online showing the difference between the old 5.0 and the mod motors...yep it is wide.

"Fit" is a relative term, with enough fabrication anything can fit, if you have to ask if can fit, well the answer is no.

right now it looks like the gm ls v8 engine is the most compact, lightest engine per hp and very affordable with nearly unlimited parts and support.

Damn that figures,..I was just cking the 4.6 gt mustang eng.all Alm. and 300 ponies,..

Yes,..the LS1 is popular,..fords have front facing intake,systems and some nice dress up engine covers,that kinda hide the whole engine...

a gm 4.8 or 5.3 is cheap to find at wrecking yards and with very easy and not so difficult or expensive mods will make your target power with ease.

http://oppositelock.kinja.com/speed-on-a-b...-und-1125469009

For fun

Engine Measurements

SBC Chevrolet 262-400
Dimensions: 26 inches wide, 28 inches long, and 27 inches tall
Weight: 575 pounds
Sump Location: Rear
Starter Location: Right

BBC Chevrolet 396-454
Dimensions: 28 inches wide, 30.5 inches long, and 29 inches tall
Weight: 685 pounds
Sump Location: Rear
Starter Location: Right

GM LS1/LS6
Width: 26 inches wide
Length: 28 inches
Height: 25 inches
Weight: 425 pounds

Ford 221-351W
Dimensions: 24 inches wide, 29 inches long, and 27.5 inches tall
Weight: 460 pounds
Sump Location: Front
Starter Location: Left
NOTES: 351W height to carburetor pad in 23-3/4 inches. 289-302 height to top of pad is 20-3/4 inches. Length for all 221-351W Ford is with short serpentine water pump.

Ford 351C
Dimensions: 24.5 inches wide, 29 inches long, and 28.5 tall
Weight: 550 pounds
Sump Location: Front
Starter Location: Right


Ford 4.6L SOHC
Dimensions: 28-5/8 inches wide, 28 inches long, and 26 inches tall
Weight: 600 pounds
Sump Location: Front
Starter Location: Right
NOTE: Width is valve cover to valve cover. Height is to top of valve covers.

Ford 4.6L DOHC
Dimensions: 30 inches wide, 28 inches long, and 29-7/8 inches tall
Weight: 576 pounds
Sump Location: Front
Starter Location: Right
NOTE: Width is valve cover to valve cover. Height is to top of valve covers.

Chrysler 273-360
Dimensions: 24 inches wide, 29 inches long, and 27 inches tall
Weight: 550 pounds
Sump Location: Front
Starter Location: Left

Chrysler 361-440
Dimensions: 29-1/2 inches wide, 30 inches long, and 29 inches tall
Weight: 670 pounds
Sump Location: Front
Starter Location: Left

Chrysler 426 HEMI
Dimensions: 29 inches wide, 32 inches long, and 32 inches tall
Weight: 690 pounds
Sump Location: Middle
Starter Location: Left

I'd bet you could do a dirt cheap rebuild on the 4.3, add an ebay'd turbo for a few hundred and get over 300hp

Thanks Messix,...I will ck those out also,..I need to pick something and get started,..no sports car is no Fun,..!!!

The advantage to the 4.3 V6 or 305/307/350 SBC is that people often sell the adapters and other parts for the swaps pretty darn cheap when they decide to part the car out or install a much more expensive to do LS1 conversion.

At this rate, maybe a strategy using "ine meenie (300hp!) miney mo" would work best.

T