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Old 08-21-2010, 02:13 PM   #14
olblue81
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Join Date: Jul 2005
Location: Saskatchewan
Posts: 189
Re: cam ideas guys???

Agree on checking out the engine forum here.

But I'll throw my $0.02 in here. With stock heads definitely go on the conservative side. Stock heads typically don't flow much more from .500" lift and above so avoid a cam with more lift than that. Larger duration will make the cam sound better at idle, but you have to rev it higher for the cam to work. From my experience a larger cam will make more power than a smaller one, but it's gets boring waiting for the motor to "come up on the cam". For example, the 350/327 cam I have doesn't really start to pull till 27-2800 rpm. With the stock heads it is wound out by 5200- that's a pretty small window really. I'd prefer something that started pulling about 500 lower and I have a 2wd so no 35s to try and spin.

Newer cam designs are much better than what I have, but it does reference my point. Comp Cams do make a neat FREE engine simulator that will help you select your cam.
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Stu-

1981 GMC Sierra Classic LWB
355- original 2 bolt block, 10.2:1, vortec heads, Comp XE268 cam, built by self in 1992
700R4-2000 stall with lockup, shift kit, Corvette servo
3.07 open diff- I need a 3.73 posi!

2nd owner since 1986 - 388,000 km and counting. 100k by the first owner and the rest by me.
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