JDMZ28

iTrader: (1)

I want to put one in my car this spring but nobody will give me info on it. I know all the specs, I just want to know how well it will work in my car. Is it too big for my heads to flow? Would I be better off with the 268? Here's my stuff. PLEASE HELP!! The car only weighs 3300lbs.

BLOCK: 89' vette 350 block
COMPRESSION: 9.3:1
CARB: Holley 650 DP
INTAKE: Weiand action plus intake(0-6000rpm) HEADS: cast iron center bolt heads
EXHAUST: 1 5/8" headers, no cat, 2 1/2"
Flowmaster catback
TRANS/GEARS: T5 with 3.35 1st gear, 3.73posi

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1986 CAMARO Z28 -> 151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframes connectors, polyurethane swaybar bushings/endlinks, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.22@ 106.4MPH Next mods-> Homemade ram air, B&M shifter, Extreme Energy 230/236 cam.

Vader

JDM,

One of my cars weights 4,400 lbs. and has an XTREME RPM 276HR-14 and 1.6:1s (.544/.544-112° LSA), and it runs fine. I lost a little low end torque, but the planned converter swap should address that before the snow melts. It has 2.02/1.60 valves in heavily ported/welded heads, stock EFI, 10.5:1 compression, and enlarged stock exhaust. Best on street tires is 14.04/94.

The 274 looks like a mechanical roller in the Comp book. Are you going mechanical?


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Later,
Vader
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"No matter how hard you try you can't stop us now"
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JDMZ28

iTrader: (1)

no it's a hydralic flat tappet. Maybe it's a 272, i don't know. It has 230/236 duration and .487/.490 lift and 110 lobe sep. In CHP they used a 268 which has 224/230 duration with my exact same heads and it made lots of low end. Thanks.

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1986 CAMARO Z28 -> 151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframes connectors, polyurethane swaybar bushings/endlinks, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.22@ 106.4MPH Next mods-> Homemade ram air, B&M shifter, Extreme Energy 230/236 cam.

ws6transam

It's probably a good cam to use with a manual transmission and non-computer controlled induction system. You'll want to be sure that you have ported those heads though... Otherwise a considerable amount of the valve lift may be wasted.

I'm using the XE262H cam in my 305, and I'm knocking on 13 seconds / 101MPH... I'm sure you'll do better as long as you address the flow.

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Daniel Burk
http://www.isthq.com/~dan/fcar.html
'84 Trans Am WS6/L69
KB SFC, Moser axles, Torsen Diff. PST suspension, Braided stainless brake lines, Koni struts, 11-inch rear disks,Spohn Adj. torque arm,
Ported 305 heads w/1.94"intake valves, Comp Cams XE262H, Griffen alum. radiator,
Turbine Technologies 2500 stall converter, underdrive pulleys, Crane Hi-6 & more.
1.05g skidpad verified.
New best E/T! 14.039 at 100.82 MPH in 41 degree air at Stanton, Michigan.

Box of Rocks

JDM,

I've got a 274 XE hydraulic in a 3130 LB. car (with driver) that works very well on the street. It will pull hard to 6,000 RPM in your 350. My buddy with a 350 and the 268 XE wants more cam - his stops pulling hard at 5,700 RPM.

It's a good all-around choice. Good luck.

BOR