New 428 turbo build w/ stock manifolds
 

Getting ready to FINALLY put that 4 bolt 428 together that I've been pondering for years. I am very fortunate that a good friend has donated a pair of used Brog Warner S200SX turbos to me for this build.


Since the turbos are not overly massive, I thought I would save some money on turbo headers and just use a pair of Pontiac D port manifolds (I have 2-3 pairs) to drive the turbos. The coin saved on custom turbo headers can then be redirected towards a quality wastegate and intercooler. I will most likely use my Jack Ferris ported 6X-8 heads but I may use the 87cc Edelbrocks depending on how the numbers work out. For the carb I will use the Quick Fuel 750DP blow thru carb I recently traded for.


Does anybody have pictures of a twin turbo setup using manifolds I can use for a reference?

Fabricated Manifolds but would give you some good info:
http://forums.maxperformanceinc.com/...&highlight=pic

Some Pics Attached.

455Turbo was a Artist when he did his Twin Turbo System. The only di8fference would be the pipes from the Exhaust Manifolds to the specific turbo He shows you where to put the Turbos and still have Power Steering and the Alternator.

Tom V.

I've always thought the '55 - ' 56 style manifolds might work for a twin turbo set-up.

https://www.ebay.com/itm/55-PONTIAC-...seJ:rk:33:pf:0

That is a very nice flowing passenger side design, no need for RA runners on a Boosted street engine.
Does the drivers side also point towards the rear (when installed normally).

Tom V.

Thank you Gentlemen for the input. Currently the bare block is on a engine cradle so I'll mock up a little of what I have and take a look at the manifolds I do have on hand.

I run factory manifolds but not towards the front like everyone else. My drivers side is a center dump style and goes under the oil pan and meets up with the pass rear dump style. Merge into one 3 1/2 pipe with my turbo mounted to the frame. I always thought if I ran twins I could use center dumps on both sides and either hard u-turn up and mount somewhere or run each center dump under the pan to opposite sides and frame mount. Driver side might be trickier with the steering shaft. I also have more engine room than most. It's actually pretty absurd how much room these GPs have

You could very easily hide a Centrifugal Supercharger fairly low on a 69 Grand Prix and many would never know it was there.
Problem is getting the belt tension right with a centrifugal S/C for most people.

Tom V