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5.7L Third-Gen Engine Build - Balance Of Power :Decision '07

Third Gen Pontiac Firebird Engine Build Short Block
This 350 crate short-block... 
   
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Third Gen Pontiac Firebird Engine Build Short Block
This 350 crate short-block could be the best option for the cash. At $1,150 shipped from Jim Pace, you could freshen up your heads, put in a decent cam and oil pump, and be off to the races with a new motor for about $2,000 total! This would be an awesome quick strike to replace a tired 305, and you could come back with better heads later. The components are good, and it's built by GM. All 5.0 or 5.7 components on your car will bolt up. GM Performance Parts has an interesting Web site feature (www.gmgoodwrench.com), allowing a prospective buyer to swap different parts onto a 350 crate short-block. GMPP then provides dyno charts for that combination.
Third Gen Pontiac Firebird Engine Build Rockers
These studs are painted red... 
   
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Third Gen Pontiac Firebird Engine Build Rockers
These studs are painted red to illustrate the 72-degree angle of the center (heat crossover) intake-bolt holes in the heads and corresponding intake-manifold bolt holes on many of the '87-'92 TPI engines. The port bolts (foreground) are at the normal 90-degree angle to the mating surface, but for reasons known only to GM, the center two bolts in each head were drilled at 72 degrees on these engines, preventing the interchange of these heads and intakes with the earlier 90-degree small-block Chevy pattern.
Third Gen Pontiac Firebird Engine Build Intake
The greasy small-block Chevy-pattern... 
   
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Third Gen Pontiac Firebird Engine Build Intake
The greasy small-block Chevy-pattern intake (top) is inverted against the Vortec-pattern lower intake, available from Edelbrock and Scoggin-Dickey. This illustrates the different bolt patterns and lack of heat crossover on the Vortec heads. The ports themselves are taller and become narrower towards the floor on the Vortec heads, a trend that became much more dramatic in the LS-series engines that followed.

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Pontiac G8 Research
Pontiac G8 A new car buyer's guide can help you narrow down your choices when deciding on your next new car. Take a look at the Pontiac G8 and view comprehensive car pricing, current rebates, incentives, safety data, & more. The 2009 G8 has a comparable standard engine, and has drivers side crash test ratings of 8 stars and passengers side crash test ratings of 8 stars. The Pontiac Solstice and the Pontiac Grand Prix are other vehicles that might interest you.

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