Im still having a terrible time with my 85 vette with a afr 195 heads, 383, miniram running so terrible i havent actually been able to drive it. I hooked a vacuum gauge to it and it pulls 5 inchs of vacuum at an idle. that seems way low. The car falls on its face if you try to drive it anything over an idle and backfires and pops out the exhaust and intake.

[This message has been edited by Wayquick4u (edited February 10, 2001).]

 

What is your camshaft specs? and try rechecking your valve-lash adjustment.
ODB




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*I do custom performance mods on Edlebrock Performer carburetors (dualplane intake mods in the works),
White 1986 Irocz, 305 with iron #416 heads,
383 with aluminum TFS heads,
Edlebrock Performer-RPM intake and Performer #1407 carburetor, +110hp shot of crack, 700R-4 tranny, Vigilante 2400 lockup converter, 3.25:1 Ford 9" rear, Mcreary Road-Stars, SLP-stainless 1.75" shortie headers & Y-pipe, single 3" Borla exhaust, Linginfelter-TPI camshaft part number 74216 pulls 17" vacuum solid. Cam specs 213/219 @.050 114-LSA, sometimes advertised at 216/219 @.050 112-LSA .462/.470 lift @1.5:1 ratio. Using Harland Sharp 1.65:1 roller rockers. MSD-6AL, billet distributor, multi-retard, blaster-3 coil, and RPM switch. SouthSide machine subframe connectors, SSM lift-bars, Moroso 4" underdrive crank pulley.

N/A runs 10.9 @124,
Crack-runs 10.3 @135
haven't run at track since Oct-99

 

I reran the valves to make sure that wasnt a problem. Im running a Hydralic flat tappet - 224/240 .507/.510 - 110 I really think this cam isnt that radical and should pull 12-15 inchs of vacuum? Do you think its a big vacuum leak?

 

Sounds like a fuel delivery problem...

Check fuel pressure, all injectors working, pulse width, etc. It could possibly also be something wrong with the TPS.

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"So many Mustangs, so little time..."
ICON Motorsports

 

Ssounds like you do have a leak or something. The blades on the T-body aren't opened up or nothing like that are they? Easy way to check for a vacuum leak is with a can of starter fluid. Just spray it in areas that you suspect a leak, around the runners, between the intake and heads, ect. Should make the engine stumble if you have a leak. You might be able to hear it with a piece of heater hose or something like that.Hope this helps you out.

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'87GTA w/ SLP Cold Air, MSD Coil, Airfoil, Gutted MAF, AFPR, TES Headers, HI-FLOW CAT, Flowmaster Catback, Energy Suspension Master Bushing Kit

 

What is your timing set at? What procedure did you use to set the valve lash? Do you have any vacuum leaks? Do you know what the computer is doing? -iac, timing, fuel delivery, proper sensor info, etc. Was the cam degreed? Have you done a leakdown or compression test? Do you have an auto or manual?

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82 z28 350cid, vortec heads, comp 262h cam, Holley 600cfm carb, 2in twice pipes, MSD ignition, turbo 350 trans, 3.73 posi, manly b&m megashifter