Hi there,

i know its a question that all of you hered but but i am going to ask it again!

Which are the best headers out there for 502mpi v-belt ??

just saw these : http://www.cpperformance.com/product...t-headers.htmc

The better question is...how much do you want to spend? and is it worth it to put on an MPI. You are looking at pricey stuff for a low performance motor.

i know, but thats what i have ..........wish had a 1650 :-)

so what you recomend as headers that are high perfomance ?

I would use a good aluminum exhaust, Dana marine, Stainless Marine.. Even the new exhaust that merc uses on the the 496 and 502 base engines flow pretty good..

yes i saw it there is a kit with exhaust Dana,MSD distributer and K&N liked it ..............anyone did this mod ?

My father went with the Gil headers, plus the K&N mod. He had bought the Dana exhaust which I liked but had to return the Dana headers because the bolt pattern was not accurately machined/drilled. Left and right motors below (the blocks are now Dart 540 cu.in.). You might gain a few mph then you will need to sort out prop(s) (add cup or go larger) and have your ECU reprogrammed. The motors kept the Mercury 502/415 cylinder heads, mild cam, 87 octane motors, 520 hp on Innovation Marine dyno, 90-92 mph, no reversion.

Don't waste $$ on MSD. There are plenty of engines up to 800 hp running GM HEI ignition.

JRider is correct; your best bet is to look for a better ready-to-go engine and sell yours as an unmolested take-out...

so if i do the Dana headers and K&N maybe i go 5000rpm because rite now i am doing 4200rpm and speed of 60mph with my Scarab 26 (prop 25)

I do not think your optimistic performance gain is realistic, maybe 200-300 rpms, maybe....someone on this board has made a similar mod to what you want to do, and will be able to give a more accurate answer. My reply is only a guestimate....

i see that you put a mild cam on in it ..........can you tell what cam it is ?