Mailbag: Examining Causes for Sporadic Spark Plug Fouling
Q: I have a mild 383-cubic-inch small block with 9.5:1 compression, Edelbrock Performer RPM intake, and 750 cfm Holley double pumper carburetor. It also has a mild hydraulic roller cam and roller rockers. My question is in regards to gas fouling on some of the spark plugs. Specifically, I’ve noticed the fouling only occurs on a couple of plugs on the
Mailbag: Causes and Cures for Engine Oil Mist
Q: I have a 1955 Chevy with a 383 motor, a four-speed transmission, and a 3.73-geared 12-bolt rear axle. The engine is a four-bolt with nodular iron crank, 9.5:1 compression forged pistons, Airflow Research heads, and Edelbrock Performer RPM intake, a 750 cfm Holley double pumper carburetor, 1 5/8-inch Hooker headers, a hydraulic roller cam
Ask Away! with Jeff Smith: Should I Block Off My Oil Filter Bypass?
I’m confused. I’ve seen magazine stories that say you should plug off that oil filter bypass in a small block Chevy but I’ve also heard that you shouldn’t do that. But with the bypass, doesn’t a bunch of oil go around the oil filter? That can’t be good, right? S.F. Jeff Smith: Essentially you are
Mailbag: Building a 12-Second ’68 Camaro
Q: I’m in the process of building a street/strip Camaro. My goal is to run high 12s in the quarter, with a few restrictions. I am going to use a 454 engine with oval port heads and 9:1 compression pistons, a stock TH-400, and 3.73 rear axle gears. What carb/intake combo, camshaft (preferably solid), headers, and
Ask Away! with Jeff Smith: Rectangle vs. Cathedral Port Heads – Which is Right for Your LS?
Everything I read says that the big rectangle ports for LS engines flow better than the cathedral ports. But then I know some pretty quick street cars running cathedral port heads. So for a 6.0L LS street engine, what would you recommend? My engine will be backed by a T-56 six-speed and 3.42:1 gears in
Mailbag: Choosing Between Even and Split-Duration Camshafts
Q: I’m building a 440 for a Ramcharger. The engine will have to pull about 9,000 pounds GCW so I want a lot of low to midrange power. The engine is bored .040 inches over, will have 9.3:1 to 9.5:1 compression ratio, and has mildly ported open chamber heads with 2.08 inch intake/1.74 inch exhaust
Monday Mailbag: Finding Possible Causes (and Cures) for Engine Bog
Q: I have a 1973 Chevy El Camino with a 350 engine, a TH-350 transmission, and a 10-bolt rear axle with 2.73 gears. All of the parts inside the engine, transmission, and axle are stock. The car is a daily driver. I have made some modifications that I hope will not only increase horsepower but
Ask Away! with Jeff Smith: Blueprint for a Budget Small Block Chevy Build
I want to build a mild, 350ci small-block Chevy for a ’77 Chevy pickup I’ll use as a daily driver. The trans will be a TH-350 with a stock torque converter and whatever the stock gears are in the rear end. I will probably put headers on it, so except for a small Holley four-barrel
Mailbag: Tips for Choosing and Installing Header Fasteners
Q: I am installing a new set of headers, and I’m trying decide on which hardware to use. Would you typically recommend header bolts, or should I step up to a set of header studs? Are there advantages to using one type of fastener over the other? What other tips do you have for choosing header
Mailbag: Mating and Sealing Tips for Milled Cylinder Heads
Q: I have a Chevy 350 small block. The heads have been milled .020-inch; the block and Weiand Stealth intake were not cut. Will I need a thicker intake gasket to mate the Stealth to the heads properly? Will I need to mill the intake, and if so, by how much? The Stealth is like-new and




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