|
Camshaft P/N Small Block /
Big Block
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Intake duration @ .050" tappet lift
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Power Range
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General engine/chassis requirements
|
|
Small Block
|
Big Block
|
|
|
237
|
1800
to
5600
|
1600
to
5600
|
Street performance. High rise dual plane intake, headers, minimum 3.55:1 rear gears. 3000rpm stall. HP ported Stage I cylinder heads. 160psi suggested cylinder pressure. Replace small street roller.
|
|
|
242
|
2000
to
6000
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2000
to
5800
|
Street/strip. High rise dual plane or small single plane intake, headers, minimum 3.70:1 rear gears. 3400rpm stall. HP ported Stage I cylinder heads. 170psi suggested cylinder pressure.
|
|
|
248
|
2100
to
6100
|
2100
to
5900
|
Street/strip. High rise dual plane or small single plane intake, headers, minimum 4.10:1 rear gears. 3400rpm stall. HP ported Stage I cylinder heads. 170psi suggested cylinder pressure.
|
|
|
252
|
2400
to
6200
|
2200
to
6200
|
Hot street/bracket racing. Large dual plane or small single plane intake manifold. 1 7/8" Big Block and 1 " Small Block primary tube headers. 3.91:1 minimum rear gear ratio. 3600+rpm stall speed. HP ported Stage I or II cylinder heads. 180psi suggested cylinder pressure.
|
|
|
256
|
2600
to
6400
|
2400
to
6300
|
Hot street/bracket racing. Single plane intake manifold. 1 7/8" Big Block and 1 " Small Block primary tube headers. 4.10:1 rear gear ratio. 4000rpm stall speed. HP ported Stage II cylinder heads. 190psi suggested cylinder pressure.
|
|
|
260
|
2900
to
6700
|
2700
to
6600
|
Drag strip. Single plane or 3x2bbl intake manifold. Maximum vehicle weight 3700lbs. (Big Blocks), 3400lbs. (Small Blocks) automatics with 4200rpm stall or 4000lbs 4 speed cars. HP ported Stage II or III cylinder heads. 200psi suggested cylinder pressure. 2" Big Block and 1 " Small Block primary tube headers.
|
|
|
264
|
3000
to
6800
|
2800
to
6600
|
Drag strip. Maximum vehicle weight 3100lbs. (Big Blocks), 2900lbs. (Small Blocks) automatics with 4400rpm stall or 4000lbs, 4 speed cars. High rise single plane intake. HP ported Stage II or III cylinder heads. 4.10:1 minimum gear. 215+psi suggested cylinder pressure. 2" Big Block and 1 " Small Block primary tube headers.
|
|
|
268
|
3200
to
7000
|
3000
to
6800
|
Drag strip. Maximum vehicle weight 2800lbs. (Big Blocks), 2500lbs. (Small Blocks) automatics with 5000+rpm stall. High rise single plane intake. HP ported Stage III cylinder heads. 225+psi suggested cylinder pressure. 2 1/8" Big Block and 1 7/8" Small Block primary tube headers.
|
|
|
272
|
3400
to
7200
|
3200
to
7200
|
Drag strip. Very light cars or dragsters. 5000rpm minimum stall. HP ported Stage III cylinder heads or ported aluminum racing heads. 2 1/8" Big Block and 1 7/8" Small Block primary tube headers. 240+psi suggested cylinder pressure.
|
|
|
276
|
3600
to
7400
|
3300
to
7300
|
Drag strip. Very light cars or dragsters or large displacement engines. 5000rpm minimum stall. HP ported Stage III cylinder heads or ported aluminum racing heads. 2 1/8" Big Block and 1 7/8" Small Block primary tube headers. 240+psi suggested cylinder pressure.
|
|
|
280
|
3700
to
7500
|
3400
to
7400
|
Drag strip. Very light cars or dragsters or large displacement engines. 5000rpm minimum stall. HP ported Stage III cylinder heads or ported aluminum racing heads. 2 1/8" Big Block and 1 7/8" Small Block primary tube headers. 240+psi suggested cylinder pressure.
|
|
|
282
|
3800
to
7500
|
3600
to
7400
|
Very light vehicles, very high stall speed, very low gears, very wide tires and hold on!
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