Slant 6 turbo motor advice...

bill dedman · 01-30-2010, 01:09 AM

This probably doesn't belong in this forum, but I can't think of anyone else to ask that would have more reliable information, so here are my questions:

Building a bracket motor for an early A Body MoPar to be used running in a car that will hopefully weigh about 2400 piounds PLUS driver

A '63 Valiant can be built at this weight, I think; gutted interior, 'glass hood, front bumper, and lots of weight-saving measures, elsewhere.

The engine will be an early model 225 c.i.d.slant 6 with most of the money being spent on a forged, stock-stroke crank, some really good rods (need info here), high-quality, forged pistons, with a reverse-deflector design @ 8:1 compression ratio, and a ported head with "big" (LOL!) valves (what a laugh!!!).

One area of this build that I have NO experience with, is the size of turbo to select

It will be a blow-through 750 Holley setup, with an air-to-air intercooler, and will run on alcohol.

I'd like to take advantage of the nearly-indestructable slant-6 block and reciprocating asssembly, and turn this thing about 7,000 rpm and utilize 20+ pounds of boost.

A sort of an inline Buick GN.

Reliability is a key issue, of course, but these engines (particularly, the early ones) are reputed to withstand a LOT of "abuse" (boost and RPM), even with their 5 main bearings and 4.125" stroke.

A "worked" 904 will deliver the power to an 8.8" Ford rear end, likely.

What I need advice on is, whether to consider the later model head that did away with the sparkplug tubes, and how much these early engines can be bored.

Also, what size turbo would work with an engine with these parameters.

I'll be researching these questions elesewhere, but I respect the opinions of the posters on this forum more than anyone else's.

Thanks for any information. Lookin' for about 600 HP at the flywheel.... Is that unreasonable?

01-30-2010, 01:09 AM	#1
bill dedman VIP Member Join Date: Feb 2002 Location: Conway, AR Posts: 1,739 Likes: 0 Liked 6 Times in 4 Posts	Slant 6 turbo motor advice... This probably doesn't belong in this forum, but I can't think of anyone else to ask that would have more reliable information, so here are my questions: Building a bracket motor for an early A Body MoPar to be used running in a car that will hopefully weigh about 2400 piounds PLUS driver A '63 Valiant can be built at this weight, I think; gutted interior, 'glass hood, front bumper, and lots of weight-saving measures, elsewhere. The engine will be an early model 225 c.i.d.slant 6 with most of the money being spent on a forged, stock-stroke crank, some really good rods (need info here), high-quality, forged pistons, with a reverse-deflector design @ 8:1 compression ratio, and a ported head with "big" (LOL!) valves (what a laugh!!!). One area of this build that I have NO experience with, is the size of turbo to select It will be a blow-through 750 Holley setup, with an air-to-air intercooler, and will run on alcohol. I'd like to take advantage of the nearly-indestructable slant-6 block and reciprocating asssembly, and turn this thing about 7,000 rpm and utilize 20+ pounds of boost. A sort of an inline Buick GN. Reliability is a key issue, of course, but these engines (particularly, the early ones) are reputed to withstand a LOT of "abuse" (boost and RPM), even with their 5 main bearings and 4.125" stroke. A "worked" 904 will deliver the power to an 8.8" Ford rear end, likely. What I need advice on is, whether to consider the later model head that did away with the sparkplug tubes, and how much these early engines can be bored. Also, what size turbo would work with an engine with these parameters. I'll be researching these questions elesewhere, but I respect the opinions of the posters on this forum more than anyone else's. Thanks for any information. Lookin' for about 600 HP at the flywheel.... Is that unreasonable? __________________ Bill