HI what is the brand name of this big block fuel pump it has 3/8 hose fittings on it,what GPH rating are these pumps ?
I have been useing this pump on my zz454 535hp 5800rmp have checked airfuel ratio its fine full throttle in top gear ,does not lay down at all
Do i just stick with this stock looking mec pump with 3/8 line me carb is 750dp proform centre body
I thought these stock looking pumps would be junk and not flow enough for this powerplant any u guys ever used these pumps on 11 sec big block
thanks victtor


http://i25.photobucket.com/albums/c53/victtor/Picture2179.jpg
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It looks like the stock OEM type pump, similiar to this AC Delco unit.
http://static.summitracing.com/global/images/prod/large/acf-41216_w.jpg
http://store.summitracing.com/partdetail.asp?autofilter=1&part=ACF%2D41216&N=700+400721+115&autoview=sku
Not sure of the flow rating but I'd say it's much less than the hi-perf Holley mechanical pump free flow rating of 120GPH.

I wouldn't expect that pump to keep up with your engine, but if it does, that's good but suprises me.

Do you have a fuel pressure gauge that you can see as you drive? If pressure is dropping below 3-4psi, according to Holley, it's not keeping up.

Hi Image Links Should Work Now Cheers

You need about 1/2# per hp per hour, so about 50 gpm would 'keep up'. I'll guess that the stock pump is rated quite a bit higher.

50gph in theory is correct, however, a safety factor of x2 is considered normal advice to overcome flow resistance and g-forces etc.. A pump closer to 100gph would be preferred in my book.:)

I had the similar OE pump and then the Holley street/strip pump (120gph) on my big block too, and it used to drop below 3psi in the top end with a 1/2 line.