Cam and Heads choice for 355 - Chevy Nova Forum
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Old 6th-July-2007, 02:52 PM   #1

Title: Nova Newbie
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Cam and Heads choice for 355

I have a 355 in my nova currently, and looking through the receipts for the engine build from the previous owner, found:

Flat top pistons.

The engine currently has the stock camel hump heads and a VERY mild edelbrock tappet cam (210 duration I/E I believe). It also has a Edelbrock performer RPM intake.

I'm looking for some more power and looking into the Comp XE274H cam/lifters and some AFR 190cc heads.

Couple questions, should I get the heads assembled or bare? I know COMP sells their cams in a kit with the springs and retainers if I chose that route, or will the springs in the AFR heads be fine?

Also, i'd like to stick with 1.5 rocker arms, will my stock ones work well, or should I get some rollers?
1969 Nova SS: 383 Stroker, 3.73's, TH350
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Old 7th-July-2007, 01:10 PM   #2
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Nova(s): 1971 V-8 A/C car
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welcome to the site!! It's a pleasure meeting new people on this site. WELCOME!!!

Now onto business

Here is the specs of the cam you are looking at. (Which BTW, I have and its great!)

Camshaft Part # 12-246-3 Designation XE274H-10
Duration @ 0.006" 274 / 286 Duration @ 0.050" 230 / 236
Max Lift w/ 1.5RR 487 / .490 Lobe Separation 110
Lobe ID#'s 5445 / 5208 Intake Centerline 106
Engine Type Chevrolet 350 Small Block
Bore 4.040" Stroke 3.480"
Displacement 356 Compression 9.25:1
Heads Dart S/R Intake Edelbrock Performer
Carburetor Holley #3310 Vac. Sec. Exhaust 1 5/8" Headers
Max Torque 410 ft*lbs @ 3900 RPM Max Power 369 HP @ 5900 RPM
Manifold Vacuum 11" Hg @ 800 RPM & 14" Hg @ 1000 RPM w/ no load

And as for the heads, AFR can handle .600 lift and come in 2 sizes, 65 or 75 CC. Plus they come in different flavors also,
180cc SBC Street Head
195cc SBC Street Head
210cc SBC Racing Head
227cc SBC Racing Head
215cc Raised Runner

If you are on a budjet and want to upgrade your stock ones, opt for the roller tiped ones. They will be fine on a mild engine. And if you want to go further, you could go with the complete roller rocker and save some valve friction. The choice is up to you. Hope this helps

1971 2-dr Nova A/C car 355 200-4R
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