Stromberg BIG97 Cadillac 331 gains 40hp

BIG97 3x2Watching a BIG97 equipped Cadillac 331inch race engine (out of an Allard) on the dyno is not something you want to miss. So off we went to Connaught Racing Engines in Kent, UK, to watch and help with jetting and tuning. The way the driver wanted to go was with three BIG97 Primary carbs for this engine, on a direct linkage. The old Edelbrock intake was opened up to take the bigger throttle bores. And the final results? Not bad for an old Cad motor!!

405lb ft torque at 3500rpm and over 350hp at around 5500rpm where these old intakes max out. Best of all, the BIG97 added some 40hp over the regular 97s, even with that old style early intake manifold. We didn’t even have to change the Primary stock jetting (0.56inch main jets). And there were no issues with residual fuel pressure on shutdown, either.

Big thanks to Peter at Connaught Competition Engines for driving the dyno, and Gus Gingell who built the engine.

 

 

Stromberg 97 at GNRS 2016

GNRS

The Grand National Roadster Show is always a blast, and this year it was as good as ever. Seven halls of hot rod and custom excellence plus many visitors parked in between. You’ve probably seen endless pictures of the cars already so here’s a few shots of the Stromberg 97 carbs on show, both regular and BIG97s. Thanks to everyone who took the time to meet us at the H&H Flatheads booth this year. And of course, a big thank you to everyone who chose 97s for their GNRS entry. Hopefully, this might give folks a few more ideas about how to use 97s on your own projects.

 

Throttle ball connection

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We are often asked about throttle linkage ball connections for various Stromberg applications, usually from the pedal to the linkage for cable or solid rod throttle connections. We recently found one we didn’t know about from Dorman. It might be handy for some folks. Click the link to check it out..

 

Dorman Help! – Throttle Ball Joint. Part #: 41030. UPC: 37495410304. 3/16-32. Brand: Dorman Help!. 

BIG97 Tri-Power Installation video

Want to know more about BIG97 Tri-Power installation? Watch Bob ‘Bleed’ Merkt modify his Chevy intake manifold and install the carburetors, linkage and fuel line on his 1932 Ford Panel. The Stromberg BIG97 Tri-Power base castings may have the same external dimensions as a regular 97, but on the inside you’ll find bigger, offset throttle bores with flared exit cones to increase airflow capability and improve air pressure recovery. The intake manifold modifications recommended here (click this link for a print-out) enhance that effect, adding even more potential to your BIG97 Tri-power.  Another great video, awesomely directed and filmed by Piero DeLuca.