dennis r

iTrader: (1)

What heads are on these motors?And are the bolt patterns the same as a big block chevy?

Hydrolift

I think the heads are made for Mercury, and they have a different bolt pattern than the std. BB. Do a search here on OSO.

Whipple Charged

Edelbrock heads made for Mercury Racing. Standard bolt pattern for bolting on to block, and manifold, different exhaust flange bolt pattern.

Pwrbt33

iTrader: (2)

Ditto!

dennis r

iTrader: (1)

How far off are the holes can a set a lightings be altered to fit

Wahoo ATV

You need to weld up 4 of the bolt holes and redrill them. You will also most likely need to add about a 1/4" of material to the ends of the header flanges to make room for the outside bolts.

dennis r

iTrader: (1)

Any one have a pic of the gaskets that show the difference in the holes?

stevesxm

just buy a gasket and use it as a template

skaterboy

I have Qty 4 - 525EFI Heads for two engines For Sale, with 70 hours of running time. Heads are complete with valves & springs, no rockers.

Ray

NicT

How much?

/ Nic