Mike C Posted November 24, 2002 Share Posted November 24, 2002 My recommendaion is the Performer RPM, non-airgap, and pony up the $ for a 67-69 Z/28 air cleaner base and a 3" K&N filter. This assembly is only about 1 1/2" above the carb air cleaner flange depending on your lid. I have the same cam in my 355 with 1.5 rockers and ported GM 492s with ProFlow valves. I run a Victor Jr., but you should be fine with the RPM. I think you will be quite pleased with that cam in your 383. I would guesstimate 450 hp and 500 lb ft at the flywheel. I "guesstimate" my hp to be about 430 and torque around 450. I don't recommend 1.6 rockers as I think they are a crutch, also valve spring longevity will be increased significantly which is important for street use. The valvetrain durability/reliability seems best with 1.5 IMO. If you need more lift, run a bigger cam. If you haven't bought the parts yet, I would spend the extra $ on forged pistons as I am not a hyeper fan. I have over 100k on the TRWs in my Jimmy's 331 and I don' notice any sort of slap on startup. Exhaust is going to be your big trouble as this combo likes 1 3/4" header. The single biggest improvement I made to the handling of my camaro was dumping the slush box for a row-your-own transmission. I am not a T56 fan per-se. Who needs 6 speeds with 500 lb ft? 3.54 gears with the Tremec 3.27 first and .68 OD is perfect combo for street/strip. (My car has a 2.62 first 4 gear and 4.11 rear, OD is the single thing keeping my car not really driveable for distance as it turns 3200 rpm at 60 mph with 26" tire.)You didn't specify carb other than CFM, but I like the Holley Classic all-mtal 750 double pumper and I would think about the electric choke conversion for drivability. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 25, 2002 Share Posted November 25, 2002 Carb is a square flange Polished Holley 750 cfm.--List no. R84011. I'm trying to get a double pumper from a friend at work. How much taller is the RPM intake compared to stock? Are there any other drawbacks to 1.6 rockers other than valve spring longevity? Thanks for the $.02 Mike Quote Link to comment Share on other sites More sharing options...
Mike C Posted November 25, 2002 Share Posted November 25, 2002 The RPM is at least 1 1/2" taller than stock. 1.6 ratio put more stress on the rocker and they tend to side load the valve more than the 1.5. They have a longer sweep across the valve stem as well which may or may not be an issue. The smaller the cam, the better solution they are. If you need 1.6 rockes, you need a bigger cam IMO. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 25, 2002 Share Posted November 25, 2002 Can anyone suggest an intake for my 240z project. Hood clearance is a concern. Small oval air cleaner is 3" tall from top of carb. Engine is a sbc 350 4bolt stroked to 383. High nodular crank, 5.7 forged rods, hypereutectic pistons, 750cfm carb, mechanical roller lifters, 1.6 rockers, cam will likely be CompCam 280AR Magnum making .587 lift, 236 dur@.050. Heads are aluminum Brodix 8RST. 10:1 CR. TH350 tranny. Car will be street driven with occasional strip and autocross. Any suggestions on cam, stall, or anything else are appreciated. Thanks Quote Link to comment Share on other sites More sharing options...
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