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Old 02-07-2006, 12:26 PM
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350 chevy heads/cam buildup

Hey folks,

So my valve seals leak on about 3 of my cylinders, so I'm going ot replace my stockheads with something newer and lighter (expensive solution, i know). It's just a 70's SB 350, 2bolt main, bored .02 over from a full rebuild about 5 years ago. It's a solid block, and doesn't seem to have any problems when I pulled it to change the oil pan and pump (hi volume). My trans is a rebuilt, shift-kit TH400.

I'm wanting to know if its a good selection of parts for my current block, and good for a swap into 4bolt 383 stroker that I plan on building in about 3 years or so that might be blown or nitrous'ed. Haven't decided between the 2 heads yet... I'm thinking I'll use my current hydraulic flat tappets for now, and switch to roller-rockers on the 383. it's 95% street, daily driver. (yes, it's my only car... and the only one I really want..for now.)

The parts list I'm looking at is as follows:<pn & $ is from jegs)

B&M Holeshot 2000 torque converter -- 130-20416 -- $160
Comp Cams XE274 cam -- 249-K12-246-3 -- $320
Cam install kit -- 720-4400K -- $52
(2) Head gaskets -- 375-1003 -- $60
Intake gaskets -- 375-1204 -- $12
Headersó
Dynomax -- 289-85001 -- $110

Headsó
AFR- 033-911J -- $1463
Chevy Street Aluminum Cylinder Heads-180cc Intake Ports,74cc Combustion Chambers

Dart- 301-11311111 -- $1224
SB-Chevy Pro 1 Aluminum Cylinder Heads-200cc Intake Ports, 64cc Combustion Chambers

any input would be awesome.. AFR never got back to me re: their heads, but DART said 'flow numbers aren't everything, ours made 1.5 more hp vs. some AFR's, even though we flow less" of course, thats instantaeneous hp I think...

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Old 02-24-2006, 08:22 AM
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"Heads?
AFR- 033-911J -- $1463
Chevy Street Aluminum Cylinder Heads-180cc Intake Ports,74cc Combustion Chambers

Dart- 301-11311111 -- $1224
SB-Chevy Pro 1 Aluminum Cylinder Heads-200cc Intake Ports, 64cc Combustion Chambers"

The heads you looking at will post different compression ratios on your motor. The 64cc might be too much for todays gas and the 74cc will lower it resulting in poor performance and may not be good for your planned motor. It all depends on your current pistons and head volume.
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Old 02-24-2006, 02:28 PM
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If you are buying the heads assembled, you won't need the springs, retainers, locks, and seals included in the "K" cam kit. Either of those heads should have springs suitable for that cam. Just ket the "SK" kit, which comes with with cam, lifters, and timing chain.

Either head would work, both are availble in ~64 cc or ~74 cc chambers, and port sizes. The smaller ports will give you better low end, usually. What intake are you going to use? You will most likely need a 1205 intake gasket with the larger heads.
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