Imco Thumper power?
 

Imco Thumper power? are they any good Ive never heard of them, what are they worth? I found a set never used new in box, was thinking about them for my 502

thanks

Couldn`t hurt maybe a little more sound and less money in y:lolhit:our pocket

IMCO's "Thumper" series exhaust manifolds are very similar to their upgrade "Power Flows". The "Thumpers" are primarily meant for replacement of stock cast iron manifolds at a more affordable price point. If you're 502 is basically stock, the "Thumper" series would be the way to good and you will see some modest performance/power improvement over stock cast iron manifolds.

thanks guys, however they only come with standard risers, and on the web site they don't offer a alt, not sure if i can buy a set for the powerflow if they bolt right up, I would think they do. but unsure.

Correct about them being a replacements piece with a a bit more flow.

IF your old iron manifolds are leaking or bad, youll pick up some ponies and lose some weight bolting these on.

The power flows are a notch up- and have larger inner diameter runners and move more volume, power flows are a great high perf manifold for all but the wildest configurations.


UD

I have them, don't expect any more HP but they are lighter and cheaper than cast iron. I really noticed a difference in how my boat comes on plane and rides with less weight on the rear.

Can Powerflows be a direct replacement for merc-gils

is your power steering pump up by the valve cover on your motor????

reason i ask is i put Imco power flows on mine last year and the 90 degree hard line that comes out of the back of the pump hit the manifold.... after doing some research i see that they make a bracket to relocate the PS pump and alternator to fix this issue ($150ish)...... would have been nice to know before every thing was installed that this might be needed....

anyway by the time i bought that relocate bracket, and then bought the brackets to mount my thunderbolt module and shift plate assembly on the other side i ended up with about and extra $200 in parts i wasnt expecting.

hmm not sure until the boat gets home