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Old 01-06-2008, 08:48 PM
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283 cam choice

Im bolting together a 283 and Ive got quick camshaft question.

The motor will see action in a '79 Buick Regal. No street, no strip, just backwoods, unsanctioned dirt track racing. Safe? Not really. Fun? You bet!

My question is this.. will I pull the studs out of the heads running a short lift, loooooong duration cam? The cam Ive got in mind is an Isky grind, part #201LR4. .420 lift / 296 adv. duration / 248 duration @ .050.

There really isn't a good reason at all to run such a large cam. Performance doesnt matter much because of the 'bald tire' rule. Good tires arent allowed, mostly to keep the ragged out cars from achieving a highly dangerous speed. Id like to run such a cam because Im not old enough to have experienced the glory days of small cube sbc's wound to the moon and Id just plain like to operate one myself. Heck Ive never even heard a small block spin past 6500r's.

Will the press fit studs stay in the heads? Will I be able to break that cam in without flattening it? Will the valve springs keep the valves away from the pistons? Any advice is appreciated.

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Old 01-06-2008, 10:18 PM
richard stewart 3rd's Avatar
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Hi John,
Sounds like fun,
283 + .060=292
Vortec heads w/1.94/1.500 valves from GM Performance
pn. 12559060
Speed Pro domed forged pistons#L2275F
for about 101/2.1 CR
Edelbrock Super Victor intake for the Vortec's pn. 2913
Should spin well past 8,000

Also you can have the block sonic tested to see if you
can bore it .125 over making it a 4" bore =302ci
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Old 01-07-2008, 07:44 AM
How fast is fast enough?
 
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I would use screw in studs at that high of an RPM range. Along with super stiff spings, and good pushrods. The super victor is way overkill for that engine, hell a Performer RPM would run fine at 7,000 RPM in a 283. Also IGNITION becomes a limiting factor at those engine speeds. Hitting 8,000 RPM in a small block is not as easy as it sounds.
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Old 01-07-2008, 03:50 PM
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Yup Richard Steward that combo would be nice, but Im not planning on dumping a pile of money into this motor. Ill be using the stock bottom end, freshened up with rings and bearings, and the stock 60cc cylinder heads.

In short, is my thinking correct that a short lift, long duration cam will be somewhat easier on valvetrain parts? Or will it come apart immediately?
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Old 01-08-2008, 07:30 AM
How fast is fast enough?
 
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as long as you don't rev it above 6500 you'll be fine... but if you really want to rev to the moon then you need to pay for the space shuttle.
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