4.3 Supercharged Chevy

[Qingdao]

Cut down the M90 some more. It almost sits flush on that LIM. Cool cause now all I need is a good 1/2" thick aluminum adaptor plate.





If I'm able to get the carb low enough I'll slap on my buddies old Duel fuel carb hat. How cool would that be having a duel fuel Porsche!!





I also put my vehicle make emblem on it; fits perfect.

[Qingdao]

Damn waiting for pieces. I ordered a 3/4" plate for the adaptor and carb, but it won't be in till Monday. In the mean time I'm twiddling my thumbs.

I did cut out this portion of the firewall. Hoooooo boy what a smell when the grinder met the old sound deadening material. It might also be my grinder is 60 years old and ready to retire.





Do any of you guys know for sure if these are the P/S hoses? They are right behind the drivers seat. They snake under the A/C compressor.

[Qingdao]

I don't really want to flood this thread with needless updates so I've stayed away for the moment. But the engine is out and for sale if anybody wants a boat anchor or coffee table. LOL

Seriously I think it might be a "re-builder". The oil filter didn't seem like it had an excess of metal shavings... IDK Doesn't matter





The Harbor Freight engine hoist which normally is quite inadequate when it comes to length did VERY well here. Just used a long chain and whola the engine is free.









Still waiting for my buddy to finish (or even start) welding my M90 so I can fit it to my 4.3 and get to rebuilding that engine.

[Qingdao]

Well I hit a brick wall. Kennedy doesn't make an adaptor for a 4.3 with an aluminum oil pan for a 5 speed boxster. They wrote me and said something about the starter not having a place with the adaptor plate.

Ah poooo.

I messaged them back to see if I could use an 88-95 4.3 engine. I mean if its the aluminum oil pan that's in the way I can work around that. Shoot mild steel is easy to work with.

I don't see the difference between a 4.3 and a SBC and the difference between the LS and SBC is .400" of bellhousing spacing. So buy an LS adaptor and add .400" of spacing???


One question I do have for any high output boxsters out there; what clutch's are yall running? I'm not seeing too many aftermarket options out there. How much power can the stock clutch hold?

[itsnotanova]

They probably did you a favor. The five speed can barely handle the power from a 2.5/2.7. The five speed won't last that long behind the torque of a supercharged 4.3. You're much better off using a 986 or 987 6 speed.

[Qingdao]

Its cause they use a proprietary starter they make in house and where they put it the starter conflicts with the aluminum oil pan.

I have a friend who, if you get on him hard enough, welds aluminum. Worst case I buy an older 4.3 and use an older block. But more than likely the oil pan is going to be custom.



So 5 speeds can't take the torque?

I have decided to tone it down a bit on the engine. No aggressive cam, light boost, stock or dish toped pistons, and only a 25 shot of nitrous at best.

I'd say 300#s on a good day.

[itsnotanova]

Originally Posted by Qingdao

So 5 speeds can't take the torque?

I have decided to tone it down a bit on the engine. No aggressive cam, light boost, stock or dish toped pistons, and only a 25 shot of nitrous at best.

I'd say 300#s on a good day.

I'm guessing you're a chevy guy? The audi/porsche 5 speed is like a T5 and the 986/987 6 speed is like a T56 in terms of power it can take. What you're doing is like connecting a SBC 350 to a T5. Sure it might work, but it won't last if you try doing any kind of aggressive driving. You're kind of limited to power with the 4.3 cast crank but even in stock form I think it's too much for the boxster 5 speed

[maytag]

Originally Posted by Qingdao

I have decided to tone it down a bit on the engine. No aggressive cam, light boost, stock or dish toped pistons, and only a 25 shot of nitrous at best.



I'd say 300#s on a good day.

I'm all for creativity, and even mods just for the sake of modding.

But I gotta ask, gently; if the goal is 300.... that's a poop-ton of work for 300..... so,.... why?
I mean.... I've done my share of gm v-6 stuff... mostly 3.8's (wasn't the 4.3 the truck motor?) And I get the fascination with turbos on 'em.... but otherwise?

It just seems like SO MUCH WORK for a 10% hp increase over a Porsche 3.2 that bolts right in.
?
Respectfully, of course.

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