Lets finish the silly season ...454 question
 

Im looking to make 500min, to 525 max hp and not eat bravos for lunch.

What I have is a gen6 block, mag crank and rods and holly efi. CAn this be done on reg rectangle heads with cam alone (say 52~5500 rpm) or will I need heads? which heads??

yes

What do you have for exhaust?

Try a water/methanol injection while running 91 octane eth/meth blend, depending on the AFR.

Rob has this EFI by the way with a MEFI 3 computer

http://www.jegs.com/i/Holley/510/550...TmMxoCyvzw_wcB


your gonna need exhaust . . . . Gils at the very least . . . . she gonna hafta breathe :D

Exhaust is pretty much a given, but gills, emi's and sm's are in the swapshop all the time,

If Im going to go that far,why not set it up for say 20% model airplane fuel???

Got a set of cmi's I can cut you a deal on and deliver.

That exact system or like that system ?

That part# has a 2000cfm throttle body. 1000cfm -1200cfm will be much easier to program on a 454 with that hp goal. IMHO.

Anyway Phragle - yeh, your hp is doable. Upper 5k rpm. Will be fine on the drive unless you drive the boat like you did when you raced offroad.

What compression are you comfortable with ? What octane can you get all the time ?

My driving style..eh....... the efi was off of an innovation 600. Compression wise, Im on the conservative side, more like the "want to be safe if I end up with junk fuel somewhere side"....

The goal is a nice dependable motor that will push my little resin bucket mid 70's. with the 310 454 Im at 61 right now, Im thinking another 200 hp and 7/`800 rpm should do it...

actually an older variant of that, it is already marinized and is based on mefi 3 and I believe it was on a 454 or 502

Yes you can with the right head and cam as well as proper tune you can do it.

Get good exhaust that won't revert and run a cam similar to the crane 741 but with the 7/4 swap. Or, the cam that innovation put in the 600s would be good choice. You need good exhaust first and KEs (thunder and lightnings now) would be my first choice, particularly if a freshwater boat. Ironically they are also what innovation used on the 600s.

If it came off an Innovation 600, it was a 540 displacement.

If its based on the MEFI 3, I have the EFI tuning software if you guys need to change the tune a little.

Got a cam, hp500efi roller. and a gen 5 454 mag shortblock. Now to work on heads. I can get the standard mag rec. port heads but Im thinking a decent set of heads will probably make a huge difference with this combo.

u should be able to hit 70 with what ur running now, some rub on some speed wax on the bottom of that tank and drive it over niagra falls. ps barrels are for p*ssys!

for what it cost to do up a set of oem rect heads ur better off with some alum aftmkt heads which will tolerate more comp as they will cool much better, and they will out flow the oem heads too