View Poll Results: wort bottle neck for making HP
penut port heads
37
33.33%
stock merc exhaust
8
7.21%
cam
7
6.31%
compresion
0
0%
all of the above
59
53.15%
Voters: 111. You may not vote on this poll
7.4L hop up
01-14-2004, 09:00 AM
#11
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Griff
Details, details. I didn't say the bottom end would have to stay together.
Could you cam it to get about 425hp at a conservative 4400 rpm, 5psi? Or would require very high cylinder pressures to generate that much torque?
Gary
Details, details. I didn't say the bottom end would have to stay together.
Could you cam it to get about 425hp at a conservative 4400 rpm, 5psi? Or would require very high cylinder pressures to generate that much torque?
Gary
01-14-2004, 11:16 PM
#12
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Originally posted by dyno
if you do a search "dynos's 330's on roids " you can see what I did....right at 500 hp now!!
if you do a search "dynos's 330's on roids " you can see what I did....right at 500 hp now!!
Some of you guys (TOM, Jafo, Crazy) know what I know and what I dont know. But it seams to me that the #1 most asked Q in here is about making more HP with the 7.4L motor. And with it being winter what beter time to sling bull and see what every one thinks. the reason I did not put Super Charging as that usually is a much large $$$ up grade then the above listed items.
Rag's
01-15-2004, 08:01 AM
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If I wanted to wake up a 330 without spending a lot of money I'd switch to a slightly larger cam, and maybe spend a little money on a Performer intake. It won't get you 450 horses but it'll make enough of a change to put a smile on your face.
01-15-2004, 08:06 AM
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I have a complete upgrade package that should work with your 7.4. HP500EFI plenum take off, cam and heads. look in the classified section under engine parts for details.
01-16-2004, 12:36 AM
#16
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Originally posted by Crazyhorse
I hope you don't drive that Chevy with that thing still on the seat,,,,,,,,,,,
I hope you don't drive that Chevy with that thing still on the seat,,,,,,,,,,,
Rag's
01-16-2004, 12:52 AM
#17
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Originally posted by john.sblendorio
I have a complete upgrade package that should work with your 7.4. HP500EFI plenum take off, cam and heads. look in the classified section under engine parts for details.
I have a complete upgrade package that should work with your 7.4. HP500EFI plenum take off, cam and heads. look in the classified section under engine parts for details.
I think I will use these. Rag's
Last edited by ragtop409; 01-16-2004 at 12:55 AM.
01-16-2004, 06:17 AM
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11-28-2004, 08:27 AM
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Re: 7.4L hop up
Rags, IMO, the real limitation with a 330 is the cast pistons. You can install a bigger cam, rect. port heads, etc, all of which will reqiure turning the motor to a higher rpm for optimum hp. In a boat, cast pistons will not live for long at these rpms. Unless you change out the pistons, expect to change out the motor when you break one. Seems to me changing pistons now would be cheaper than a new motor and lost time in the summer.
