350 Pontiac

Getting the cobwebs out of a 350 engine in a 69 Lemans. Old gas and bad timing along with years of sitting limited the performance. Complete engine and TH350 transmission are for sale. See www.minnesota-muscle.com for details.

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The tired Pontiac 350
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How to set your ignition timing
Setting the timing on your engine is one of the most misunderstood adjustments, but the information on this video will help you understand and answer all of your questions about ignition timing.





Changing the rear main seal. Final
Here we show you how to get the upper and lower rear seal out now that the bearing is off.





Pontiac 350/421 Heads 1-3/4" Hedman Headers Flowmaster 2.50" Crossflow:
First fire-up video of my 1975 Firebird Formula with Pontiac 350 using '092' 421, small chamber/small valve heads. Camshaft is a custom ground UD with .466"/.467" lift - 220°/226° @ .050" on a 111.5° LSA. Cranking compression is 185-190 psi. Headers are 1-3/4" primary, 4-tube Heddmans #28150 with mandrel-bent, full-length 2.50" Exhaust system. Muffler is a Flowmaster #42585 Transverse-mounted crossflow with mandrel-bent 2.50" tailpipes and factory-style, 2.50" stainless steel hockey-stick tips. Carb is n 800cfm Q-Jet with .070" main/idle air bleeds, .074" main jets, .045" primary metering rods, 8 in/Hg power piston spring, .037" idle tube restrictions, .046" idle channel restrictions, 'G' secondary metering rod hanger with .029" (CC) metering rods. Transmission is a M-20 Muncie with a 8.5" disc brake 10-bolt with 3.23:1 gears. Car went on to produce 311 RWHP and 325 lbs/ft RWTQ on pump gas through the mufflers. Ignition is HEI with zero ohm carbon button, .080" AC R46SZ plugs .080" gap and 20° BTDC at idle, 8° of manifold vacuum advance (28° total @ idle) 16° centrifigal, 44° total timing.




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