702 Dimensions

What if you could take an overhead valve V-8 engine and add 4 more cylinders to it making it a V12? How cool would that be?

Done! ThunderV12!

Unlike the old firetruck V-12's that are either flathead designs (Seagraves, Pierce-Arrow) with the exhaust coming out of the top of the engine or 30 degree engine designs (LaFrance, Auburn) that look like a wide straight 6 engine,  the ThunderV12 engine looks like a long modern overhead valve V8...but longer.

The width compared to a bigblock Chevy or Ford, is the same to slighlty narrower depending on valve covers and heads used on the bigblocks.

The height of the V12 is around 9" taller. Nearly all of this additional height is oilpan. The Y block design of the V12 causes only about 1" of crankshaft to show below the block. The V12 oilpan can be shortened substantially if required for clearance. The pan is 10 5/8" tall. We have built a drysump oil pan in-house that is only 2" tall.

Length. This is what puts the hot in hotrod! This engine is roughly 20" longer than the bigblock comparisons!

Engine mounts 

The original 702 V12 had a front center mount under the accessory case and two rear mounts on each side of the bellhousing. A ThunderV12 does not use the original industrial bellhousing. The rear adapter plate developed by ThunderV12 has incorporated mid-plate ears on both sides to allow for engine mounting. The front center mount is used as designed by GMC. 

Width = 21" outside valvecover to outside valve cover.

Height = 36" from bottom of oil pan to top of carb.

Length=53" from front of mandrel pulley to rear of transmission adapter.

Weight = 1,405 lbs with 3 gallons of oil. ( We had a guy with a straight 8 Packard respond "My straight 8 with transmission was 1,750 pounds."