Rockin-Iroc
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Dec 19, 2006
- Join DateJan 2002
- LocationMorrison, Colorado
- Posts:266
- iTrader Positive Feedback0
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- Car1986 IROC-Z
- Engine355 ci TPI, 10:1 cr, Isky cam, ported heads, dual exhaust
- Transmission700R4, ratchetting shifter, 3.23 rear
- Likes:0
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Let's see if I can remember without having to look it up at home...
It's about a 274 degree advertised, hydraulic flat-tappet cam.
It is 221 degrees @ 0.050" intake/exhaust (symmetrical grind).
It has 0.465" lift, int/exh.
I don't want to guess at the LSA, I'll have to look that up.
It passes emissions fine. I was at only 1/4th the allowable limits in my smog test, done on a dyno at various rpm's the way they do it in Denver now. The engine is a 10:1 compression 355 with about 14,000 miles on the rebuild I did 3 years ago.
The heads are mildly ported, with a 3-angle valve job to aid breathing. But the valves are only 1.94/1.50". On a low rpm motor like a tuned port, I figured I'd maximize torque rather than try and get it to rev another 1000 rpm for a bunch of money.
This kind of cam requires a good-flowing exhaust to perform well. If the exhaust is unmodified, then I think an assymmetric grind with more duration on the exhaust would help. In fact, that could always help.
It's about a 274 degree advertised, hydraulic flat-tappet cam.
It is 221 degrees @ 0.050" intake/exhaust (symmetrical grind).
It has 0.465" lift, int/exh.
I don't want to guess at the LSA, I'll have to look that up.
It passes emissions fine. I was at only 1/4th the allowable limits in my smog test, done on a dyno at various rpm's the way they do it in Denver now. The engine is a 10:1 compression 355 with about 14,000 miles on the rebuild I did 3 years ago.
The heads are mildly ported, with a 3-angle valve job to aid breathing. But the valves are only 1.94/1.50". On a low rpm motor like a tuned port, I figured I'd maximize torque rather than try and get it to rev another 1000 rpm for a bunch of money.
This kind of cam requires a good-flowing exhaust to perform well. If the exhaust is unmodified, then I think an assymmetric grind with more duration on the exhaust would help. In fact, that could always help.