WEBER carb?
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WEBER carb?
I have an oem WEBER carb on my 1992 502 and was wondering:
1) what is the CFM?
2) what is the maximum power I can expect out of a (this)Weber.
Currently it is on the 6269316 aluminum intake with spacer- stock.
Been running fine but looked a little crusty so I am planning a reseal. ONly engine mods (complete rebuild) w/ a valve job 551/530 crane cam & a decent exhaust ( cmi's unitops).
Thoughts-thanks
1) what is the CFM?
2) what is the maximum power I can expect out of a (this)Weber.
Currently it is on the 6269316 aluminum intake with spacer- stock.
Been running fine but looked a little crusty so I am planning a reseal. ONly engine mods (complete rebuild) w/ a valve job 551/530 crane cam & a decent exhaust ( cmi's unitops).
Thoughts-thanks
#3
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Re: WEBER carb?
It's 750cfm.
Merc put 800+cfm Holleys on their 420hp & 450hp 454s and their 500hp 502 motors. So one might suspect it's at it's limit with 410hp.
The holley and weber are both squarebores, so a holley will bolt up with a new fuel line.
Gary
Merc put 800+cfm Holleys on their 420hp & 450hp 454s and their 500hp 502 motors. So one might suspect it's at it's limit with 410hp.
The holley and weber are both squarebores, so a holley will bolt up with a new fuel line.
Gary
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Re: WEBER carb?
Originally Posted by rdoactive
It's 750cfm.
Merc put 800+cfm Holleys on their 420hp & 450hp 454s and their 500hp 502 motors. So one might suspect it's at it's limit with 410hp.
The holley and weber are both squarebores, so a holley will bolt up with a new fuel line.
Gary
Merc put 800+cfm Holleys on their 420hp & 450hp 454s and their 500hp 502 motors. So one might suspect it's at it's limit with 410hp.
The holley and weber are both squarebores, so a holley will bolt up with a new fuel line.
Gary
#5
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Re: WEBER carb?
Originally Posted by Reed Jensen
Why switch to a Holley?...
So what readily available marinized carb is over 750 cfm, cost effective, easily tunable, squarebore pattern?
Holley. Ta Da!
Gary
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Re: WEBER carb?
Thanks,
Very good points. Honestly I don't know the real h.p. but must assume it is over 415-450. I have not dyno'd after I have done below mods.
I used the mild Crane 132561; lift 530/551, duration 228/236 with 114 set at 0 with a built-in 5 deg advance. light porting (recontour short turn radius). with roller rockers with a full balance of rotating assy and 5 angle valve job hopefull will net in the mid 400's.
I have read that you don't want to overcarb so I wanted to stay on the conservative side (not really knowing the h.p) until I step up to the afr's and more agressive cam . or after I do some plug readings with the Weber.
In reality I have overblown my budget on above and not sure if this carb would work for the break in process or will it choke to not perform properly. I need more time to pass for the wife to forget about the expenses on this project
Thank again
Very good points. Honestly I don't know the real h.p. but must assume it is over 415-450. I have not dyno'd after I have done below mods.
I used the mild Crane 132561; lift 530/551, duration 228/236 with 114 set at 0 with a built-in 5 deg advance. light porting (recontour short turn radius). with roller rockers with a full balance of rotating assy and 5 angle valve job hopefull will net in the mid 400's.
I have read that you don't want to overcarb so I wanted to stay on the conservative side (not really knowing the h.p) until I step up to the afr's and more agressive cam . or after I do some plug readings with the Weber.
In reality I have overblown my budget on above and not sure if this carb would work for the break in process or will it choke to not perform properly. I need more time to pass for the wife to forget about the expenses on this project
Thank again
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Re: WEBER carb?
The Webers were 750cfm.
I would replace it with an 800 Holley. I just don't know enough about fine tuning a Weber. Also, you will be able make apples to apples comparisons with jetting and tuning it.
I would replace it with an 800 Holley. I just don't know enough about fine tuning a Weber. Also, you will be able make apples to apples comparisons with jetting and tuning it.
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Re: WEBER carb?
great info-
replicating what merc has used on their more-than-mild 454/502, they have used 800 Holleys.
Thank you all
BTW, cp just announced this below package on sale-thoughts?
Intake/Carburetor Kit
620-54000
HP 500 Style Intake/Carburetor Power Package
If you're looking to build an HP 500 style motor but are not sure of exactly which parts you may need, then this kit is for you. Nothing could be easier.
We have combined all the necessary items to produce an HP 500 style package in kit form. This kit includes:
(1) 620-53031 Hardin Marine Big Block Chevy Intake Manifold
(1) 710-9022 Holley Marine 800 CFM Carburetor
(1) 620-52001 Intake Allen Bolt Kit
(1) 620-53106 Carburetor Stud Kit
(1) 300-17342 Extreme Seal Intake Gasket Kit
(1) 620-04112 Water Outlet Gasket
Sale Price $804.95 $699.95
(Savings: $105.00)
replicating what merc has used on their more-than-mild 454/502, they have used 800 Holleys.
Thank you all
BTW, cp just announced this below package on sale-thoughts?
Intake/Carburetor Kit
620-54000
HP 500 Style Intake/Carburetor Power Package
If you're looking to build an HP 500 style motor but are not sure of exactly which parts you may need, then this kit is for you. Nothing could be easier.
We have combined all the necessary items to produce an HP 500 style package in kit form. This kit includes:
(1) 620-53031 Hardin Marine Big Block Chevy Intake Manifold
(1) 710-9022 Holley Marine 800 CFM Carburetor
(1) 620-52001 Intake Allen Bolt Kit
(1) 620-53106 Carburetor Stud Kit
(1) 300-17342 Extreme Seal Intake Gasket Kit
(1) 620-04112 Water Outlet Gasket
Sale Price $804.95 $699.95
(Savings: $105.00)