I have center bolt TPI heads. My friend ports heads and he will do mine for free. To what extent should I have them ported?This is for the Z28 with the mods listed below(350, headers, intake). I'm going to install either comp cams 268XE or 274XE.

The questions are: Which cam should I use and how much port work should I have done? Cost is not an issue.

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1986 CAMARO Z28 ->
151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, B&M Ripper shifter, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframe connectors, all bushings are urethane, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.22@ 106.4MPH 3300lbs less driver and speakers Next mods-> Extreme Energy 268 cam, Holley street dom intake.

1987 TRANS AM ->
73,000 miles, 305TPI, auto, gutted air box.

 

if ya can get em ported to the hill then get them ported to the hill... if he flow tests them though, i wouldn't suggest any more than 200cc runner volume.. anything bigger than that and ya might have bog problems...

also, if ya get them ported to that hill, go witht the bigger cam, especially if your gonna put a better intake on and headers. if your leaving the induction alone, definately go with the smaller cam.. the tpi stock justWONT keep up. do runner, port the base and it should be better

Steve

 

No, no, no. The car already has headers and a holley street dominator intake. It is a carbed engine with a 650 DP. Besides a TPI engine couldn't handle that big cam.

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1986 CAMARO Z28 ->
151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, B&M Ripper shifter, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframe connectors, all bushings are urethane, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.22@ 106.4MPH 3300lbs less driver and speakers Next mods-> Extreme Energy 268 cam, Holley street dom intake.

1987 TRANS AM ->
73,000 miles, 305TPI, auto, gutted air box.