Factory Stock L72 427 Build
 

One of the factory stock racers gave me a chance to build a L72 427 which I appreciate. Growing up around GM performance cars as kid in SoCal, then having a 68 Z28 with a L72 in high school left me very excited about this engine build. The build consisted of a 289 casting block with all the machine work, turning a tuftrided indexed 366 crank, custom JE pistons, modified oiling system, Bullet L72/LS6 cam, unported 840 heads, custom valves from Ferrea, factory GM rectangle port intake. Power in factory stock trim with a conservative tune was 535 HP @ 6300 RPM and 523 HP @ 6700 through the factory cast exhaust manifolds with the factory correct carb.

Re: Factory Stock L72 427 Build
 

Wow!!

How's it going Mark?

Re: Factory Stock L72 427 Build
 

I was fortunate to have owned a 66 Vette roadster with the 427-425HP when I was in my very early 20'S. 40 years later I still feel that car. History like that never dies.

Re: Factory Stock L72 427 Build
 

Ohh come on Mark, you could never make that kinda power thru manifolds... [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

Congrats

Re: Factory Stock L72 427 Build
 

OK , i'll answer that myself.... YES YOU CAN!!!!! Congrats

Re: Factory Stock L72 427 Build
 

What could that run in a chevelle?

Re: Factory Stock L72 427 Build
 

A certain, 2 door post L89 &quot;396&quot; went 12.12 at PSMCDR, haven't seen any L72 COPO Chevelles run yet, they would be the heavier 2 door hard top, so maybe a little faster? I would love to see this combo at PSMCDR.......

Ryan

Re: Factory Stock L72 427 Build
 

Thanks for taking the time to speak with me about the lifter situation I ran into.https://www.yenko.net/ubbthreads/pics...68-photo_4.jpg

Re: Factory Stock L72 427 Build
 

i saw this thing on the dyno and its killer.

Re: Factory Stock L72 427 Build
 

Translate that 427 to a 69 Corvette spec L88 with much better flowing exhaust manifolds and you will see why they are low 11 second cars. No wonder they break out even when they aren't trying.