anyone run a 4 7 swap camshaft?

[flattie]

Did anyone run one of these cams? How do they like it? Does the engine sound any diffrent?

[Jetboatguru]

Did anyone run one of these cams? How do they like it? Does the engine sound any diffrent?
Engine sounds the same. They do make a little more power. If you are dragboat racing trying to squeeze everything out of your motor then put one in. If not, you probably wouldn't notice a difference between the two.

[flattie]

Well Im going to try to pick out a bigger cam for my engine within the next few week or so. Just wondering if it is something I should consider doing

[Jetboatguru]

It you are buying a new cam either way, get a 4/7 deal. Just dont forget to redo the plug wires. :D

[PGF500]

I have one in my pro gas engine. If you have an over sized cam 54mm I have a brand new spare comp cams. Don't know the exact numbers on but I can look on the box. Let me know if you are interested.
Cole

[flattie]

ordered one today custom grind I did the 4-7 swap along with a 3-5 swap. Should be a brain buster for the next guy

[the real k-boat king]

It you are buying a new cam either way, get a 4/7 deal. Just dont forget to redo the plug wires. :D
dam i didn't know you were a engine pro to.:D

[steelcomp]

A header change is usually a good idea to take advantage of the 4-7 swap. Honestly, most guys leave so much power on the table by overlooking other things they should be concentrating on, that they'll never really get the benefit out of a 4-7 swap. If you have everything absolutely dialed in with your combination, then -sometimes- a 4-7 will net you more power. Rarely, though. I woldn't bother.

[turbo wog]

i had a fuel problem & burned # 7 (3 times) & # 4 once with # 7 . . the 4-7 swap would have gave me a little insurance from what i understand. its in the degrees of which they fire .7 gets some exaust pushed into the cylinder from 5 i believe? (not sure wich cylinder 4 gets heated by) but causes temp in 7 to go up hotter than the other cylinders & put exaust in cylinder also. it doesn't matter if you have long tube headers but water logs it does. someone else might know the exact facts,but this is what ive been told.

[LandSpeedRacer]

Hey man . . . . . :confused: :confused: :confused: :confused:
After reading your post . . . . . :confused:
I think what you need is two more turbos!

[Jetboatguru]

dam i didn't know you were a engine pro to.:D
Gorgy,
I am not an engine pro. But I did stay at a Holiday Inn Express last night.

[steve d]

ordered one today custom grind I did the 4-7 swap along with a 3-5 swap. Should be a brain buster for the next guy
Familiar with a 4-7, 3-2 swap. What is their claim with the 3-5?

[cstraub]

The 4/7 swap for a professional race team can be some added HP but to a avid power boater it is "Marketing BS". If this mill is a comptetion only piece or has a large stroke in the engine ( the 4/7 swap will help with crank harmonics) then a 4/7 swap has merit. If this mill if for pleasure and under a 4.500" stroke then the 4/7 is marketing.

[flattie]

4-7 3-2 swap my typo in the last post

[PGF500]

4.500 stoke what is this 1978?

[RICHARD TILL]

I run a 7-4 swap cam made by bullet. Its a big assed cam for racing only. .757 lift, 311/315, @.050 is 280/284 and 110 lobe separation. Its in a texas tunnel with a 496 chevy, brodix BB 2 plus heads with a barry grant 1150 holley carb. I was shooting for the 10 sec. class when i put this combination together and luckily i hit right on the number. The only time this motor runs smooth is at 6500 w.o.t. I`ve never run another cam in this motor so i do`nt know if another would be better or not. All i do know is that i`m satisfied with this one.

[steelcomp]

I run a 7-4 swap cam made by bullet. Its a big assed cam for racing only. .757 lift, 311/315, @.050 is 280/284 and 110 lobe separation. Its in a texas tunnel with a 496 chevy, brodix BB 2 plus heads with a barry grant 1150 holley carb. I was shooting for the 10 sec. class when i put this combination together and luckily i hit right on the number. The only time this motor runs smooth is at 6500 w.o.t. I`ve never run another cam in this motor so i do`nt know if another would be better or not. All i do know is that i`m satisfied with this one.
With smaller heads and a smaller cam, you could run low 9's.