Twin Turbo Tall Deck

[Rustbucket350]

We've all seen twin turbo builds before and this is going to be a little different. This is a 366 flatbed turd. I got this motor for free and the only thing I could think of to do to make any reputable hp was to bolt two Chinese turbos to it and run it at as much boost as it'll take. For those that don't know, the 366 is the 427 tall decks ugly cousin with the same crank but smaller bore. You can't bore it to a real big block bore, but it does have about a 4 inch bore and a 3.76" stroke. It's like a 383 in a heavy, big block, canted valve platform.

This is a 91 tbi motor. I don't like tbi for tuning so I tracked down a really old 4 barrel factory manifold. The 4 barrel manifold actually has larger diameter runners that match the head ports perfectly, unlike the tbi intake that had tiny runners. I guess that'll raise the powerband about 500 to 1000 rpms which is fine since these supposedly peak around 4000 and provide more airflow.

I'm keeping the short block stock including the cam. It has dome pistons and 427 tall deck truck heads.

My best guess is if it works it'll make around 450 hp and 600 lb ft at 10 psi. I'm not doing this for numbers though. I see a lot of hate on these motors and I figured I'd put 500 bucks into it and see what it runs at the track. If I'm not happy, I'll add two Chinese intercoolers and swap the wastegate springs.

 

[Peck]

I support this endeavor.

 

[Rustbucket350]

I support this endeavor.

If I could figure out how to post a picture I would.

 

[Rustbucket350]

If I could figure out how to post a picture I would.

Got it.

 

[xten]

This should be interesting to say the least. Kid's 433 has a forged crank out of an old school bus 366, 7.5:1. Single 91mm, no innercooler home made blow thru. Made 1056 HP to the wheels. Went 8.60 @ 162.

 

[1980RS]

I wonder what my peanut port engine would do with a turbo?, it's only 7.8 comrpression.

 

[Rustbucket350]

It should be a fun build. I'm just waiting on the elbow adapters for the turbos, a timing chain, and some gaskets. I'm gonna keep this as cheap as possible which means take the hood off and put the exhaust up across the windshield. I don't think it'll make 1000 hp in my dreams but if I put slicks on the car it might put on a good show.

 

[RS1979]

What are you going to put it in?

 

[Rustbucket350]

If it runs well I'll put it in my 80 Camaro til I get one of my other builds done. The headers may need some modifying to clear the control arms though. The turbos are the cheap China .57 trim T3/T4. I figured I'd want it to spool fast since its a 366 and makes its peak power at like 4500 or 5000 rpms. Here's a good teaser.

 

[Rustbucket350]

I should correct that last post to say it makes its peak horsepower at 4500 or 5000 rpms based on the 4 barrel intake having larger ports and the carb not having a governer (the carbureted version came with a governed 450 cfm holley). It makes its peak torque way lower than that but its hard to find any accurate details on what these made. I believe the TBI version made 250 hp at 4,000 and 385 lb ft at 2,000 based on some internet hearsay.