340 or 318 turbo
Tilleys vc valiant has been into the high 10s out here in oz a few years ago now so that means he can't run it anymore without a roll cage. It has been around a long time and was always built as a street car definitely not for drag racing with stock suspension and runs 2.92 or 3.23 gears in the rear. Runs smooth as with a great programmable EFi setup.
A friend of mine has a valiant , same model as the tilleys turbo slant out here with a turbo 318/390 setup in it and blow through carby from Brent miller in the USA. The car is so driveable and puts out around 600hp at the wheels with ease. That's from a motor that naturally aspirated would be putting about 350hp to the wheels. It has a single turbo with custom 4 into 1 pipes with a crossover from the drivers to passengers side. There are a few videos of it on YouTube if you type in turbo vc valiant.
They are an awesome idea, very driveable and tame until you put your foot down!
Tilley's fuel injected engine is definitely the one to beat, currently, that's for sure!
The turbocharged slant sixes seem to respond well to rear axle-ratios in the high twos... like 2.76 or 2.93, for some strange reason.
Both Ryan Peterson's '66 Valiant and Tom Wolfe's 120+ mph 3,300-pound car have proven to run faster and quicker through the quarter-mile with those tall ratios than they could with, say, a 3.90. Something about the turbo response to the engine's being "held back" that makes them produce more power.
That is weird, but it enhances their utility as a daily driver because it gives them the capability of highway cruising with no need for a complicated, expensive overdrive transmission, and does so without any kind of penalty.
Add to that, the smooth, low rpm idle that accompanies the mild cams that turbo motors seem to need, and the street driveability is almost like a stock motor.... until you punch it! :blob:
Slant sixes and turbos go together like ham and eggs... a marriage made in Heaven! I just wish I'd discovered that about 40 years ago...:banghead: