Help is just a click away!
Click here to chat with a Speedway Team Member
Online - Chat with us!
Products to Compare (max of 3)
Compare These Parts
Talk to the Experts. Call 800.979.0122, 7am-10pm, everyday.
Since 1952
Talk to the Experts. Call 800.979.0122
Shop By
Street Race Truck More... The Toolbox

Chevy II Nova Gasser: 496 Big Block Engine Build


As we’ve been planning our Week to Wicked Nova build, we’ve been trying hard to create a period-correct car. As we’re choosing parts, we constantly defer to an imaginary 20-year-old kid in the late 60’s who’s trying to build a potent street/strip car. Something that he could be competitive with at the local drag strip, then cruise down main street on Saturday night.

Not only did our big block have to make big power, it had to look at home in a 60's engine bay.

So what engine would our hero have chosen? Well, after 1965, the new big block was the baddest thing to wear a bow-tie. So, we chose to follow the time-honored hot rod tradition of stuffing the biggest engine available into the compact car inherited from grandma, then hitting the streets, bound for glory.

Our starting point. It didn't take much imagination to see the potential in this 454.

In our case, we knew that there was a 454 sitting in a grungy heap at Speedway Motors Racing Engines. After a little pleading with shop boss Zach Woods, the engine was ours. The engine shop crew disassembled the engine and stored away just about everything that wasn’t the block and main caps. The block was align-bored with ARP studs, bored to 4.310", and then torque plate honed, all using state of the art Rottler CNC equipment.

The balanced rotating assembly consists of a SCAT cast steel crank with a 4.25” stroke, SCAT forged 4340 I-beam rods, and Icon forged pistons with a 38cc dome. With 136cc chambers, that works out to an 11:1 compression ratio. This all adds up to 496 cubic inches, and we love the subtle nod to a period-correct 396, but with a hundred extra cubes.

The assembled short block. You can see the dome in the piston peeking up above the deck.

Zach was a little conservative with the cam selection since we wanted to be able to drive this car on the street. He selected a Comp hydraulic roller with 242/248 degrees of duration at .050” and .540”/.560” of valve lift with 1.7:1 PRW rockers.

It was important to us that this engine was something that almost anyone could duplicate with a reasonable budget, so we used rectangle port FloTek heads straight off the Speedway Motors shelf, with no fancy port work or mods. Out of the box, these are stout heads, with 320 cc runners and 2.250"/1.880" stainless valves.

The FloTek heads look a little too new for our vintage-styled engine, but make up for it with economical pricing and impressive performance.

We could have been sensible and used a single-plane, single carb intake, but there’s nothing sensible about a gasser. With that in mind, we chose a Weiand tunnel ram and two 650 cfm Holley 4150’s. With these goodies bolted on and the engine still hanging on the stand, we almost needed a step stool to hook up the linkage. Cool.

This engine cuts an imposing profile bolted to the engine stand. We can't wait to see it between the fenders of our Nova.

What about those valve covers? Those are special. In case you didn’t know, there’s a huge and very impressive museum attached to Speedway Motors called the Museum of American Speed. It’s filled to the rafters with vintage engines, race cars, and automobilia. They have a few parts set aside to be used by their restoration crew, and we spotted these valve covers on the shelf next to about a thousand vintage carburetors. They are NOS, still in the box Cal-Custom die-cast pieces with a period perfect black wrinkle finish. After a little begging, we were allowed to take them out of the archives and bolt them to an engine for the first time in fifty years.

And now for the moment of truth. The engine looked the part, but what kind of power would it make? The first pull was conservative, and Zach lifted at 5,500 rpm. Even so, we were pleased to see 632 horsepower on the screen. After some tweaks to the timing curve and a change to 67 primary/70 secondary jets in both carbs, our final pull netted 646 horsepower at 5,800 rpm and 656 lb/ft of torque at 4,800. Should move our little Nova around pretty well.

Here it is, glowing like a jewel, ready to be installed in our Nova gasser.

Car Craft editor Johnny Hunkins and contributor Rocky Rotella were there for the build, so you can look for a full feature on Also, be sure to follow our Week to Wicked build the week of August 12th-16th. That’s when we’ll stuff our 496 into our little Nova and really make some noise.

Products Featured in this Article

Related Articles

Chevy II Nova Gasser: Week to Wicked Day Five Recap
by Speedway Tech Team - Posted in News
We're wrapping up things on our Chevy II Nova Gasser build, firing it up, and making some noise around town! Check out the final day of Week to Wicked.
Chevy II Nova Gasser: Week to Wicked Day Four Recap
Our Chevy II Nova Gasser is looking like a real car! Today we're jumping into more wiring, interior, steering column, and wheels and tires.
Chevy II Nova Gasser: Week to Wicked Day Three Recap
We have a full day ahead of us with the radiator core support, getting all the sheet metal back on, and wiring the engine. Check out day three of our Chevy II Nova Gasser build!
Chevy II Nova Gasser: Week to Wicked Day Two Recap
Today’s we’re doing all the plumbing of the brakes, the fuel system, the trans cooler, but we’re most excited about the 496 big block Chevy backed up by the Powerglide transmission!
Chevy II Nova Gasser: Week to Wicked Day One Recap
Our stock 1967 Chevy II Nova rolled into MotorTrend Group's Santa Ana Tech Center this morning and we won't sleep until it's 1960's drag strip ready!
Chevy II Nova Gasser: Week to Wicked Build Team
by Speedway Tech Team - Posted in Tech
In one week, Jeff, Joe, and Zach, along with Car Craft Magazine, will take an old 1967 Chevy II Nova back in time to the days when Gassers ruled the strip. No dress up here—it will actually be able to race. Meet the build team making it happen!
Slicks go on, Car Comes off the Lift, and the Finish Line Approaches
by Speedway Tech Team - Posted in News
Jason also lights a table on fire, but that’s not as exciting as seeing how the Chevy II Nova sits with all the cool stuff underneath. Not much looks as good as drag slicks.
Time Flies When You’re Wiring
by Speedway Tech Team - Posted in News
Day one and two were all about the big stuff. Day three was the opposite. Which isn’t to say we didn’t enjoy ourselves. Needless to say, we were glad to have Steve’s energy on the details day.
One Big Block, a Few Drag Strip Essentials, and One Visit from the Junkyard.
by Speedway Tech Team - Posted in News
Yesterday, the front came out. Today, a big block Chevy goes in. Jeff and Zach drop some knowledge, and everyone gets a surprise from the Junkyard.
Building our Chevy II Nova Gasser a Wicked Foundation
by Speedway Tech Team - Posted in News
Starting with a Speedway Motors Gasser Axle Suspension Kit and our 9-Inch Housing with 3.89 gears, the Speedway Motors Build Team and Car Craft Magazine build the Chevy II Nova Gasser a rock solid foundation.