I think the 292 is just fine to use....and besides, if you compare the costs of all the components needed to do the 4200, plus the cost of the engine alone, you would be twice the money going the 4200 route.
Ok I've been quiet up to now..
From the above post
Quote
Well... Doing it yourself or paying someone?
Start with intake and exhaust.
Offy intake manifold: $200
Holley 390 CFM carb: $350
Holley 500 CFM carb: $300 (I'd go 500)
Langdon split headers: $270
Exhaust: $500-750
Cam and springs, cam gear, gaskets: $500
Head work: $750
HEI: $100
Unquote
All this adds up to
$2170.I just bought a complete 2007 3700 ( the 5 cylinder version of the 4200 from a colorado )and a 4l60E from the local pick-n-pull yard today for
$580 tax included.
The only part I didn't take was the A/C compressor - everything else is there including the gas pedal and full harness.
What else is needed
oil pan - modify the stock one or buy rear sump pan for $635 + $80 for a oil pump pickup tube from GM.
Add $200 for an EFI fuel system less if you use boneyard parts.
ECM tune and harness strip $500 from Jeremy..
So this adds up to $1995 - cheaper than mod'ing a 292 and you end up with a 310 HP bone stock engine (I added 15 HP for a free flow exhaust).
Want 450HP turbo it for another $1200 including turbo, up pipe, tune and bigger injectors. Add $300 in parts to tweak the trans to hold the extra power..
One thing for sure the 4200 will get better fuel mileage than the 292.
One guy in Florida says he can get 4200's complete for $400.
