Marine or stock roller cam

[80' 427]

Well the time has come to replace the 454 in my blue truck. I few too many times above 1400egt when it had the turbo must of hurt it because it runs hot and has pretty low oil pressure so I have decided to pull it and send it to irrigation duty and use the 100k gen VI vortec I have.

The old motor was a stock peanut port motor 7.8 to 1 compression with a street warrior intake, 204/214 cam and headers on lpg (since impco 425)

The new motor is again a stock vortec short block with 781 heads,7.8 to 1, a stock low rise intake and the same headers and again on lpg.

So now the big choice. So when I bought this 454 as a core I was still using a turbo so I bought a mercuiser Mag cam for $35. Knowing the engine will be cfm limited to about 4000-4500 would you use the stock vortec cam or the mercriser?

Stock l29 cam has
204/209 duration 480/483 lift 118 lsa

Mercriser cam has
224/224 duration 483/483 lift and 115 lsa

I am guessing with the 460 cfm carb I will be limited to 4000ish rpm for power (the old 454 peaked at 3950 with a qjet and lpg). Mostly looking for low end grunt but I would guess it is always 2000 rpm or higher. I guess since I have it I may just try it. Suggestions?

 

[80' 427]

p.s. we wouldn't even be having this talk if my buddy and local chassis dyno operator wasn't pushing me to use the bigger cam.

 

[80' 427]

So no one?

 

[Chevy305]

Any boosted engine benefits from a cam with more overlap. The more overlap, the more scavenging that takes place, and results in lower EGTs and cooler pistons/combustion chamber. I say you should go even bigger than that merc cam.

Do you have an intercooler?

 

[80' 427]

Any boosted engine benefits from a cam with more overlap. The more overlap, the more scavenging that takes place, and results in lower EGTs and cooler pistons/combustion chamber. I say you should go even bigger than that merc cam.

Do you have an intercooler?

Not boosted anymore. That is just how I hurt it.

 

[Chevy305]

Oh in that case def go with the merc cam. You might sacrifice some off idle torque but overall power will be much improved.