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| Mac Winter 76XB351GS |
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Gday.
Ive got a 351clevo with extractors into 2.5 twins, pretty much standard heads and cam and a Edelbrock proformer intake manifold. Ive got a Holley 600 vac sec and a Holley 750 double pumper sitting here, both freshly rebuilt, just wondering what I should run. Thanks.
_________________ 76XBGS, 383c, custom crow cam, 4V p&p heads, Isky SS Valve+springs, extractors, 2.5"twins, MSD Ignition, Edelbrock intake, Forged bottom end, Barry Grant 750DP, thermo, discs, toploader, Holley fuel pump, SUPERCHARGED! |
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| Interceptor |
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IMO if you arent gonna race it, the 600 should be ok
_________________ Banned |
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| Mac Winter 76XB351GS |
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So put the 600 on for now until I get the heads and cam done, then the 750 will be best?
_________________ 76XBGS, 383c, custom crow cam, 4V p&p heads, Isky SS Valve+springs, extractors, 2.5"twins, MSD Ignition, Edelbrock intake, Forged bottom end, Barry Grant 750DP, thermo, discs, toploader, Holley fuel pump, SUPERCHARGED! |
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| Interceptor |
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pretty much, yea
a 650 vac sec is IMO pretty much ideal for a tame 351, but you need to bump it up 100cfm+ when you start doing stuff to the internals
_________________ Banned |
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| Mac Winter 76XB351GS |
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Ok then, would there be any difference in leaving the 750 on the manifold (Its currently mounted on the manifold which I will be putting on the motor on wednesday) and swapping over the jets from the 600 (600 is currently on the stock manifold on the motor)? Would this perform the same as the 600 or would you reccomend saving the stuffing around and just putting the 600 on the performer manifold instead....hope that makes sence.
_________________ 76XBGS, 383c, custom crow cam, 4V p&p heads, Isky SS Valve+springs, extractors, 2.5"twins, MSD Ignition, Edelbrock intake, Forged bottom end, Barry Grant 750DP, thermo, discs, toploader, Holley fuel pump, SUPERCHARGED! |
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| Walker |
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A 750 is way too big unless you do some serious work, even if you do heads and cam you will find the 600 to be sufficient.
I have seen so many guys over carb engines it's not funny. I had a worked 351 C in my XD and had a 750 vac on it, to me it was too big for the work i had, a 650 would have been better... but square bore has always been the go with Holley, most spread bore (especially the 650 DP) were always known as trouble... going from personal experience here. I see Intersexual is still doing Street Machine LOL. |
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| Mac Winter 76XB351GS |
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Fair enough. Iv decided I'll put the 600 on and get it tuned again. Looks like I'll have an expensive paperweight for a while.
When I get the heads and cam I'll put the 750 on, get it jetted and tuned then go down for a few runs on the dyno and see how she goes compared to the 600.
_________________ 76XBGS, 383c, custom crow cam, 4V p&p heads, Isky SS Valve+springs, extractors, 2.5"twins, MSD Ignition, Edelbrock intake, Forged bottom end, Barry Grant 750DP, thermo, discs, toploader, Holley fuel pump, SUPERCHARGED! |
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| pinkbits8u |
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id stick with the 600 for sure , id stay with it until you are going for at least 375hp
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| orloxsis |
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I got an 850 Barry Grant Carby sittin in my garage... Fits a 351.
_________________ AU XR8 manual. |
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| pinkbits8u |
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what sort , condition etc
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| MikGan |
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Yup, another vote for the 600, Ive got a 770 and that suits my motor just fine, but for a stocker 600 will do.
_________________ I couldnt fix your brakes so I made your horn louder
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| Mac Winter 76XB351GS |
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I picked the performer intake and 750 today. It turns out its a vac sec not a double pumper, which is good because Id rather that. It looks so damn nice, all clean with its little fuel pressure gauge. Im thinking as it is already mounted on the intake, I'll put it on as is and then swap the jets over to suit the motor as it is now and then I can just swap the jets back when I do the heads and cam if it needs it.
Just a little question though. On the vacuum side of the carb there is an arm to open the secondarys, it looks as though there is supposed to be a spring going from the arm and attaching to a small swinging link fixed to the vacuum diaphram housing. Does this sound right, because there is no spring there now and the secondarys dont want to close unless you lock them open then give them a tap, when which, they snap shut. See pic. Also are there supposed to be plugs in the fuel ports on the side of the carb not being used, or are these sealed by the large screws in the centre of the carb at each end?
_________________ 76XBGS, 383c, custom crow cam, 4V p&p heads, Isky SS Valve+springs, extractors, 2.5"twins, MSD Ignition, Edelbrock intake, Forged bottom end, Barry Grant 750DP, thermo, discs, toploader, Holley fuel pump, SUPERCHARGED! |
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| Mac Winter 76XB351GS |
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Sorry dont worry about me, just hit a bit of a learning curve. Theres not supposed to be a spring, its a cable guide for a manual choke.
_________________ 76XBGS, 383c, custom crow cam, 4V p&p heads, Isky SS Valve+springs, extractors, 2.5"twins, MSD Ignition, Edelbrock intake, Forged bottom end, Barry Grant 750DP, thermo, discs, toploader, Holley fuel pump, SUPERCHARGED! |
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| Walker |
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If you don't plan on using the choke mate, put a rod or something between the clamp and lever to stop the choke closing.
Better still, do what i did to mine and cut the whole choke shroud off. |
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| Mac Winter 76XB351GS |
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I went around to my mechanic last nite and he said the same thing. I'll get it on there and see if it needs a choke. I dont mind either way, my other car has a manual choke, Im used to it now.
I think my mechanic is more pumped than I am about gettin this all on the engine and running right.
_________________ 76XBGS, 383c, custom crow cam, 4V p&p heads, Isky SS Valve+springs, extractors, 2.5"twins, MSD Ignition, Edelbrock intake, Forged bottom end, Barry Grant 750DP, thermo, discs, toploader, Holley fuel pump, SUPERCHARGED! |
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