Offshoreonly.com - 454-330 build up help

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I just built mine up and am 150% disappointed with my results
I did 9.5:1 hypereutectic pistons
Swapped peanut heads with large ovals
installed edelbrock performer intake
Comp xe-268H12 11-242-3 224/230 515/521 110 LSA
With rochester I produced 331 HP
With 750 carter I produced 365
With 850 Holley I produced 387 HP all in and around 4500-4600 RPM's
This was tested with Gil Merc HP 500 exhaust
She fell flat on her face
with the up in compression from 8 to 1 to 9.5 to 1 I thought I was in and around the mid to upper 400's in HP
WRONG
this was a real POOR choice of cams, I do NOT recommend it what so ever.
peaks at 4400 which is fine, but choose a cam that is more going to peak towards the 5000 mark and just have enough carb to spin it that high.
more than 5000 r's on a cast crank is okay, should be fine, but for reliability purposes, I would not push it or your going to have issues at some point.
the large oval heads stock, not worth spit, either get rectangle heads or dont get heads at all
these large ovals are basically worthless over the stock peanut heads and arent worth a crap unless you can sit there and port the hell out of them and like someone else said, you might as well just buy the rectangle heads cause your going to go broke opening these up more.
I got this cam out of the list of Dennis Moores book and it says okay results on a stock 330 but on the dyno, more or less sucks monkey balls.
if you want to produce a major increase in power on a 330 you have to get aggressive with the parts.
dont buy intermediate stuff, go for the big stuff
you can always keep it for other boats and keep stock stuff to put back on to sell it.
Good luck
Jason

Quote:

Originally posted by 'bago Baja
bobby,
Please explain this cheap way out for exhaust. What are the tops? What do you weld up and where are the holes drilled? Is this a modification to the stock exhaust?
Thanks,
Tom

I USE C.P.OR SOMEOTHER STAILESS RISER AND WELD UP THE WATER HOLES AROUND THE EXHAUST THE REDRILL 2 ,,1/4 INCH HOLES AND ADD A DUMP TO THE SILENT CHOICE Y PIPE OR TO MAKE A SHOWER TO THE DRIVE TOP,,
TO KEEP AIR LOCKS OUT AND THIS REALLY WAKES THE BOAT UP
TO GET THE WATER OUT AND THE NEW ANGLE RISER
PM ME WITH YOUR NUMBER AND I'LL GO INTO MORE DETAIL IF NEEDED I CAN'T TYPE WORTH A ^^%^^$^
BOBBY

Quote:

Originally posted by blue thunder
Thanks Bobby... great input. I only have somewhere between 8:1 and 8.2:1 compression at the moment. What affect would this have?

I have thru hull exhaust and am shopping for used imco risers to mix water further away, but may still use stock 4" risers if nothing is found.

Thanks for the help,

BT :cool:

TRY TO GO 8.75 ITS WORTH A GOOD BIT OF TORQUE ,YOU NEED TO GET WATER OUT ,OUT OF THE EXHAUST FUTHER AWAY WILL NOT HELP I CAN HELP WITH SOME RISER IF NEEDED PM ME WITH NUMBER I'LL GIVE YOU MORE INFO

ANGLE CUT HEADS ,I DO IT SO THE STOCK UNCUT INTAKE WILL FIT 40.00 /ITS EASY
LATER BOBBY

'Foul,

Thanks for the offer. You've got mail!