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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: 454c10 on February 02, 2015, 11:32:16 pm

Title: I have a 454 question?
Post by: 454c10 on February 02, 2015, 11:32:16 pm

I have a 454 out of a 1984 rv and i was wondering if there is a diffrence in stock or rv cam power wise or anything  what generation  it is and would it be hard to get 500hp outa it easy

Title: Re: I have a 454 question?
Post by: fxrsrider on February 03, 2015, 12:25:49 pm

Cam is only one small, albeit important, element in producing max HP.  Intake, carb cfm, heads, valves, pistons, stroke, crank, bearings, rods, compression, converter.....basically the whole drive train is involved in getting your pony to 500hp.  Then there's 500hp at the flywheel?...or 500hp at the rear wheels?

check out the following links to see original specs and what others have experienced vis a vis performance.

http://www.chuckschevytruckpages.com/enginespecs.html

http://www.corvetteforum.com/forums/c3-tech-performance/2612919-454-out-of-a-truck-motorhome.html

How easy is is?  I could refer you to a machine shop here in Los Angeles that can rebuild that motor to whatever specs you want.....for them it's easy.  It all depends on how easy it is for you to write a check.

Title: Re: I have a 454 question?
Post by: Captkaos on February 03, 2015, 01:24:06 pm

Depending on the year one in an RV would be the same as what is in a truck.  To get more power you would need to design the engine as package as indicated above.  Cam change requires certain design changes as it all needs to work together.  If it is a peanut port head you are limited to about 5500 rpms tops so that limits you cam choice.  Same goes for the pistons and compression ratio...

Title: Re: I have a 454 question?
Post by: Engineer on February 03, 2015, 08:18:47 pm

First thing you should do is ditch the heads.

Look for a set of "049", or "781" castings. These were early to mid 70s issue and are easy to draw 500hp out of.

I have a 1973 454 with 049 heads, Sealed Power H426P pistons, Holley Strip Dominator intake, a mild Crane street solid lifter, flat tappet cam, and Holley 4160 750cfm carb. I'm in the 500hp range and it will turn 7,000rpm all day long.

My 049s have had 2.19/1.88 valves with pocket porting, and gasket match.

The 049/781 oval port heads flow well enough to give good HP numbers and still maintain the low end torque we need to get these heavy pick up trucks moving.