magnum or la stroker

[Chryco Psycho]

the heads are good for some power increase for sure but I am no fan of the Chev rockers , so I tend to use the 308 heads , they have the flow & the shafts

[matt63]

The Eddy's flow better than stock heads and, if I recall correctly, the Magnum version flowed slightly better than the LA version.  I had a little work done to my Eddy Magnums along with flow testing but I can't recall the numbers.  I wonder how much work is required to get stock iron heads to flow that well?  The Eddy Magnum heads have the smaller 58cc combustion chamber vs the 62/65cc LA and 340 head

[Chryco Psycho]

any alum head needs to have at least 8 cc smaller combustion chamber just to compensate for the heat loss to alum

[femtnmax]

Yes the Edy magnum heads have smaller combustion  chambers, but when you unshroud the valves the chamber CC's goes up about 5-6 cc's, so then you have to mill the heads to drop the cc's back down, and be sure to set the piston tops at zero deck (top of block).

[matt63]

Yes, zero decking should be the goal along with 10.5 compression w/aluminum heads.