From 454 to 540...
 

I´d like to hear opinions on heads, intake and cam choice for a 540 build-up. Short block is done in Merlin std height block with Eagle rotating kit apprx. 9.5:1 cr with 119cc heads. Afr`s, E-brocks or Merlin`s? Cam -731, -741 or ? It`s going in 24` Mach 1 that currently runs 67mph w/500hp 454.

s-24

Re: From 454 to 540...
 

Lots has been written on this subject and there are lots of opinions. I would contact rmbuilder. (a member here) He is extremely knowledgeable and can put a program together for you tailored to fit any specific situation. But in any case; Remember that you want advice from MARINE engine builders, NOT the street and track guys! --- Jer

Re: From 454 to 540...
 

I was thinking of going 454 to dart 540 block build up but then i found out that it would require alot of new rigging and new parts including better motor mounts, better fuel lines and that such parts to support the more hp.

Re: From 454 to 540...
 

Don't waste your time on the merlins or edelbrock marine heads,they barely flow over 300intake/200 exhaust which is real close to stock rectangle ports. The AFR heads in a 305 or preferably a 315 cnc have OUTSTANDING flow numbers (approx 380 in/310 exh at .600 lift). I would contact rmbuilder(AKA bob madera) at585-654-8583 as he is a distributer for afr heads and can probably give you the best deal on them anyways. He also does custom cam design and will sell you a custom ground hyd roller that will work as promised the first shot for just about same cost as you'd pay for a off the shelf grind at most places.He has spec'd out cam and head combos for numerous board members that are giving excellent results in the boat,not just on the dyno. A 540 is a nice size,big enough to make great tq,small enough to install with out using a tall deck block and running into exhaust hole issues,Smitty