Watching 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 Competition 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 Phil at Connaught Competition Engines for driving the dyno, and Gus Gingell who built the engine.
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- BIG97s on Cad intake
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- Stromberg BIG97s
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- BIG97 racing jet change
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- Stromberg BIG97 dyno curves
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- Stromberg BIG97 dyno figures
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- BIG97s at Connaught
Hi Clive,
Just read the report on the visit to us. My name is Phil. Driver of the Dyno, and proprietor of Connaught competition engines.
We did another recently, this needed bigger main jets. With a different cam and built in-house by Jamie came out at 337BHP
So happy with that.
Thanks Phil, All updated as requested. And thanks for the info on the new engine. Always pleased to hear about successes with BIG97s.