B&M (Weiand) 174 Supercharger Engine Build - Ford Muscle Forums : Ford Muscle Cars Tech Forum

xafalcon · 09-26-2008, 04:32 PM

I am about to build a budget engine for use under a B&M 174 supercharger. I would welcome some comments on the engine specs I'm thinking about. Please, let's not open the debate on Roots v's Centrifugal Superchargers. I bought the B&M because in my opinion they look great. Here are the engine build details

- 1990 5.0 HO with TRW forged pistons & HO Roller Cam
- Refresh engine (has no bore wear at all) with rings, bearings, oil pump, timing chain etc
- 1980 351W heads (69cc chambers, should give about 8.2:1 compression)
- 1.7 ratio pedistal mount roller rockers
- Crane spring and retainer kit for the roller cam with .030 shims to increase seat pressure to counteract boost on backside of the valve.
- DSS Main support system
- MSD6BTM

I'm thinking this should be a strong motor capable of handling all the power the B&M can produce. The cam has a nice wide lobe separation angle, and the increased lift from the roller rockers will help breathing.

Thanks in advance

plovett · 09-26-2008, 05:55 PM

I think the heads are going to kill the power. Especially on a blower motor.

A blower motor needs better heads than a naturally aspirated motor that is otherwise similar. The old thinking was that a blower will force air/fuel through the heads so it doesn't matter if the ports are too small. Now we know that is incorrect. The opposite is true. A blower motor needs even better heads and larger ports to handle the greater volume of air/fuel.

I'd get some aftermarket heads, even if this is a budget type build. Even some cheapo used Edelbrock Performer heads are going to be light years better than the factory 351W heads. Heads! Heads! Heads!

JMO,

paulie

iwantmore · 09-26-2008, 06:14 PM

With the idea of keeping cost down I think it looks good. I would suggest using ARP rod bolts, resize the rods and a good balance. Then drill and tap the 7/16 block to match the 1/2" 351 head bolts. That allows you to use the higher 351 head torque and gives a lot of extra clamping cheap. I turboed an 1800 Ford Courier in the 80's and a little boost will make even a pathetic little engine suddenly have power. I met a guy with one of those in a 66 Falcon with close to a stock 5.0 Mustang motor and he told me when he was not running slicks he had big traction problems. So I need one too!