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| Supervisor42's 1988 Pontiac Trans Am GTA | |||
| T-top delete bought in Georgia. Engine swap, TPI for homebuilt 350: Engine is blueprinted after the 350/350 L46 GM made in 1969 only. Rotating assembly balanced 6 grams from heaviest piston/rod to lightest. Block: 2 bolt main 350 block seasoned, standard bore from '80 pickup. piston deck height .020" Crank: Cast, mains .010 undersize. Rods: stock, selected from 16 proof tested Oil pump: Stock new replacement. Pistons: TRW LF2304 forged 11:1 with moly rings. Dome volume +.1cc (I paid $249.00 for these in 1984) Cam: Isky 280 HL. duration 280` at 0 lift. 224` duration at .050 lift. valve lift with 1.5 rockers: .465 intake & exhaust. lobe center: 108` (a little hotter than the '69 L46 but very close). Lifters: Isky 202-HY anti-pump-up. Cylinder heads: "462" heads from '68 327/300 (called "camel-hump") 1.92 intake 1.5 exhaust fully ported. (will outflow stock 2.02's) 63cc chambers. Cylinder head gaskets: GM steel shim type .016 compressed (very important) Valves: Stock. Valve springs: Isky 6005 double springs 1.430" OD. Retainers: Isky 507-STA (installed spring height .063 above stock). Rockers: Stock 1.5 with pressed in studs. Intake: Factory aluminum q-jet manifold. Carburetor: 750 Quadrajet Distributor: Stock HEI from 72-74 with adjustable vacuum advance and spring & weight kit from Jegs. (has been run to 6700) Spark plugs: Champion RJ12YC gap: .035 Starter: Delco double-shunt from 454 (I rebuilt) 168 tooth flex plate 2300 stall lockup converter Headers: Headman long tube. |
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