Big Block Clones

Big Block Clones We are a Tennessee, USA based small engine performance parts manufacturer specializing in big & small block clones.

Check out bigblockclones.com to upgrade your minibike or go-kart engine. We are a small engine performance parts manufacturer specializing in big block clones. We are here to support the karting, side by side, small boating, mini bike, and other performance industries and hobbyists. There is no replacement for displacement, and we are here to produce the largest displacement small engines possible.

Six weeks worth of titanium.
05/29/2026

Six weeks worth of titanium.

05/25/2026

Playing around with the BBC Level II kit on the Manco Dingo

05/22/2026

We are getting ready to start a new big block build next week. We had never flowed this Duromax 440 head so we decided to get some numbers. This one flowed a max of 111 CFM at .385” lift with a 35mm intake valve. Most 420/440 heads flow 110-115 stock.

America is turning 250 years old! Place an order of $25 or more to get your FREE limited edition Big Block Clones sticke...
05/21/2026

America is turning 250 years old! Place an order of $25 or more to get your FREE limited edition Big Block Clones sticker! Just 250 available. Bigblockclones.com

25 Amp Charging Kit for Big Block GX and Clones - GX390 - Predator 420 - Duromax 440 - Wildcat 460 ...
05/18/2026

25 Amp Charging Kit for Big Block GX and Clones - GX390 - Predator 420 - Duromax 440 - Wildcat 460 25 Amp charging kit for Big Block GX and Clone engines comes complete with 25amp stator, 12 volt digital voltage regulator, weatherproof fuse, and cast iron flywheel with high performance charging magnets. Designed specifically for GX390, 420, 440, 460, and our 500cc engines so that auxiliary equipment such as lights, stereos, fans, pumps, and any other electrical accessories can be run off of the engine.

Includes:

Stator
Voltage Regulator
Fuse
Flywheel
Associated wiring
Not recommended to exceed 3,600RPM.

04/27/2026
Our 25 Amp charging systems are back in stock!
04/23/2026

Our 25 Amp charging systems are back in stock!

Remember to be kind to your valve springs. And if you can’t be kind to your valve springs change them early and often.
04/22/2026

Remember to be kind to your valve springs. And if you can’t be kind to your valve springs change them early and often.

Start your big block build! Deck Height 173.4mm/6.827”Uses 7-Bolt GX390 style side co...
04/15/2026

Start your big block build! Deck Height 173.4mm/6.827”

Uses 7-Bolt GX390 style side cover.

Available in 90mm or 92mm bore size. Accepts all standard GX390 parts.

Address

Clarksville, TN

Opening Hours

Monday 11am - 7pm
Tuesday 11am - 7pm
Wednesday 11am - 7pm
Thursday 11am - 7pm
Friday 11am - 7pm

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