25' sleek- 4400 rpm,45mph--problem?

[Squirtin Thunder]

the pistons are a dish type,the grind # on the cam is (ff 312ah-10)
jet boat with a/b impeller,rough idle, 108 lobe seperation,try p/n 311-4,msd has a selectable rev limit set @6400
How big of a dish ??? Which version of th SCJ head did you get ??? There are there combustion chamber sizes.
I did a search on Comp just using the 311-4 and it came up with these two choices.
Camshaft Specification Table
Part Number 20-311-4
Engine 1964-2000 Chrysler
273ci-360ci
8cyl.
Grind Number CRS 270AH-10
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.47 0.48
Duration At 0.006 Tappet Lift 270 280
Valve Timing At 0.006
Open Close
Intake 29 61
Exhaust 74 26
These Specs Are For The Cam Installed At 106 Intake CL
Intake Exhaust
Duration At 0.05 224 230
Lobe Lift 0.313 0.32
Lobe Separation 110
Recommended Valve Springs 901-16
Camshaft Specification Table
Part Number 11-311-4
Engine 1965-1996 Chevrolet
396ci-454ci
8cyl.
Grind Number CB 270AH-10
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.532 0.521
Duration At 0.006 Tappet Lift 270 280
Valve Timing At 0.006
Open Close
Intake 29 61
Exhaust 74 26
These Specs Are For The Cam Installed At 106 Intake CL
Intake Exhaust
Duration At 0.05 224 230
Lobe Lift 0.313 0.3063
Lobe Separation 110
Recommended Valve Springs 911-16
Also did a search using the grind of ff312AH-10 and this is what I came up with.
Camshaft Specification Table
Part Number 11-340-4
Engine 1965-1996 Chevrolet
396ci-454ci
8cyl.
Grind Number CB 312AH-10
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.6 0.6
Duration At 0.006 Tappet Lift 312 320
Valve Timing At 0.006
Open Close
Intake 46 86
Exhaust 90 50
These Specs Are For The Cam Installed At 110 Intake CL
Intake Exhaust
Duration At 0.05 260 268
Lobe Lift 0.353 0.353
Lobe Separation 110
Recommended Valve Springs 924-16
Camshaft Specification Table
Part Number 12-356-4
Engine 1955-1998 Chevrolet
262ci-400ci
8cyl.
Grind Number CS 312AH-10
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.54 0.54
Duration At 0.006 Tappet Lift 312 320
Valve Timing At 0.006
Open Close
Intake 46 86
Exhaust 90 50
These Specs Are For The Cam Installed At 110 Intake CL
Intake Exhaust
Duration At 0.05 260 268
Lobe Lift 0.36 0.36
Lobe Separation 110
Recommended Valve Springs 986-16
I don't see a Ford cam yet !!! :hammer2: :hammer2:

[gregr1971]

How big of a dish ??? Which version of th SCJ head did you get ??? There are there combustion chamber sizes.
I did a search on Comp just using the 311-4 and it came up with these two choices.
Camshaft Specification Table
Part Number 20-311-4
Engine 1964-2000 Chrysler
273ci-360ci
8cyl.
Grind Number CRS 270AH-10
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.47 0.48
Duration At 0.006 Tappet Lift 270 280
Valve Timing At 0.006
Open Close
Intake 29 61
Exhaust 74 26
These Specs Are For The Cam Installed At 106 Intake CL
Intake Exhaust
Duration At 0.05 224 230
Lobe Lift 0.313 0.32
Lobe Separation 110
Recommended Valve Springs 901-16
Camshaft Specification Table
Part Number 11-311-4
Engine 1965-1996 Chevrolet
396ci-454ci
8cyl.
Grind Number CB 270AH-10
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.532 0.521
Duration At 0.006 Tappet Lift 270 280
Valve Timing At 0.006
Open Close
Intake 29 61
Exhaust 74 26
These Specs Are For The Cam Installed At 106 Intake CL
Intake Exhaust
Duration At 0.05 224 230
Lobe Lift 0.313 0.3063
Lobe Separation 110
Recommended Valve Springs 911-16
Also did a search using the grind of ff312AH-10 and this is what I came up with.
Camshaft Specification Table
Part Number 11-340-4
Engine 1965-1996 Chevrolet
396ci-454ci
8cyl.
Grind Number CB 312AH-10
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.6 0.6
Duration At 0.006 Tappet Lift 312 320
Valve Timing At 0.006
Open Close
Intake 46 86
Exhaust 90 50
These Specs Are For The Cam Installed At 110 Intake CL
Intake Exhaust
Duration At 0.05 260 268
Lobe Lift 0.353 0.353
Lobe Separation 110
Recommended Valve Springs 924-16
Camshaft Specification Table
Part Number 12-356-4
Engine 1955-1998 Chevrolet
262ci-400ci
8cyl.
Grind Number CS 312AH-10
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.54 0.54
Duration At 0.006 Tappet Lift 312 320
Valve Timing At 0.006
Open Close
Intake 46 86
Exhaust 90 50
These Specs Are For The Cam Installed At 110 Intake CL
Intake Exhaust
Duration At 0.05 260 268
Lobe Lift 0.36 0.36
Lobe Separation 110
Recommended Valve Springs 986-16
I don't see a Ford cam yet !!! :hammer2: :hammer2:
The only # i can find for the heads is --M-6049-B429??????
The # on the pistons are-L2404F60.......... .180 Dish
The cam card i left on my desk at work,BUT on the box it shows--34-258-4
grind-FF312AH-8???---I am almost 100% positive that the card reads ---34-311-4/grind # FF312AH-10?? I know that i didnt put no stinkin chevy cam in there! maybe i can scan the card and post,or maybe i am just blind.......

[Squirtin Thunder]

The only # i can find for the heads is --M-6049-B429??????
The # on the pistons are-L2404F60.......... .180 Dish
The cam card i left on my desk at work,BUT on the box it shows--34-258-4
grind-FF312AH-8???---I am almost 100% positive that the card reads ---34-311-4/grind # FF312AH-10?? I know that i didnt put no stinkin chevy cam in there! maybe i can scan the card and post,or maybe i am just blind.......
Here is the cam card info for you:
Camshaft Specification Table
Part Number 34-258-4
Engine 1968-1994 Ford
429ci-460ci
8cyl.
Grind Number FF 312AH-10
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.61 0.61
Duration At 0.006 Tappet Lift 312 320
Valve Timing At 0.006
Open Close
Intake 48 84
Exhaust 88 52
These Specs Are For The Cam Installed At 108 Intake CL
Intake Exhaust
Duration At 0.05 260 268
Lobe Lift 0.352 0.352
Lobe Separation 108
Recommended Valve Springs

[hack job]

no need for the marine version!
its a waste of money and the mighty demon price is 499. all day at most speed shops and summit.
http://store.summitracing.com/partde...=KeywordSearch

[Squirtin Thunder]

http://www.cranecams.com/?show=techarticle&id=2
:clover: :clover:

[gregr1971]

squirtin thunder- i took apart the bg carb- here are the jet sizes---
primary # 85
secondary #93
primary power valve 6.5
secondary power valve plugged
2 squirters @ .31 ea.
label on box reads: race demon 975 cfm downleg boosters "drag race only"
oh yeah .... .. thanks for the help,will let you know how it turns out

[Squirtin Thunder]

no need for the marine version!
its a waste of money and the mighty demon price is 499. all day at most speed shops and summit.
http://store.summitracing.com/partde...=KeywordSearch

Sorry Tyson with a closed engine compartment the US Coast Guard requires a Marine Carb. Summit does not sell the Demon in Marine, Jeg's is your line on that.

[spectras only]

Gregr , the 850 holley marine carb has 88 primary 94 secondary jets , 6.5 PV . Your jets seem small for your carb . Boat the size of yours would be better with a "AA" impeller ,providing you have min 450 HP.

[Squirtin Thunder]

Take a look at this cam. what do you think, is it too big ???
260* at .050, Hmm what is that, about 310 to 320 ??? For a boat that size I would think that 230 to 245 would be about max. He tried a 750 it helped a little. I don't believe his main concern is the carb right now. I think it's picking the right cam for the application.
Just my thoughts.
Jim
Here is the cam card info for you:
Camshaft Specification Table
Part Number 34-258-4
Engine 1968-1994 Ford
429ci-460ci
8cyl.
Grind Number FF 312AH-10
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.61 0.61
Duration At 0.006 Tappet Lift 312 320
Valve Timing At 0.006
Open Close
Intake 48 84
Exhaust 88 52
These Specs Are For The Cam Installed At 108 Intake CL
Intake Exhaust
Duration At 0.05 260 268
Lobe Lift 0.352 0.352
Lobe Separation 108
Recommended Valve Springs

[spectras only]

I think the cam is too big . 230- 240 @ 0.050 , around 560 lift would be right for a heavy cruiser.