Possible clearance issues...
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Junior Member
Joined: Jul 2003
Posts: 6
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Possible clearance issues...
I posted this in the TPI forum, but maybe I will get more responses here...
I have an 1989 Iroc. As you all know it has the 350TPI/Automatic. I just purchased a Hydraulic Roller cam for it. The cam is the Crane Powermax and it has an advertised duration of 284/292 and a lift of .509"/.528". Will this be a problem with the stock pistons with valve clearance? I also understand that the PROM will have to be reflashed but will it run decently in the meantime until i can get it reflashed?
I have an 1989 Iroc. As you all know it has the 350TPI/Automatic. I just purchased a Hydraulic Roller cam for it. The cam is the Crane Powermax and it has an advertised duration of 284/292 and a lift of .509"/.528". Will this be a problem with the stock pistons with valve clearance? I also understand that the PROM will have to be reflashed but will it run decently in the meantime until i can get it reflashed?
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Probably won't be a problem with the pistons, but your retainer-to-guide clearance will be.
That's a lot of cam for a stock PROM.
That's a lot of cam for a stock PROM.
TGO Supporter
Joined: Aug 1999
Posts: 14,811
Likes: 1
From: Jackson County
machine the head, replace the springs and trash the factory rotator set up and use aftermarket retainers, while you're at it might was well machine the head and trash the pull out studs.
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