Cylinder Heads 101

915 ported 1.88 168 96 185 229 248 283 285
587 ported 2.02 170 94 177 223 251 287 287


BJR, these are the two that seem out of place. These are higher by a fairly significant numner than I've seen for CNC ported edelbrocks (By Indy, but tested elsewhere) with relocated pushrod holes. Those iron factory iron, and in the 915s case, is not even what I'd call a "late model" port. (meaning high velocity, high swirl)

MrMopar, I think you missed my point. I'm sure BJR can make power...the theory is fine, but there are little things I found to be misleading to a guy building. Nothing personnal, dont make it so. I certainly dont toot my own horn, and I'm a pessemist to start with (hence the screen name?), but I find skeptics keep the final results clearer.

I appreciate the posting others do..You never stop learning..I never stop questioning. My personnal opinion is that what is mentioned about large valves being shrouded and a bigger bore for bigger engine, is true, but not for applications where the engine has to do more than just produce max power. A race engine needs that, but has a tight window (rpm wise) to operate in. I find a lot of race theory has little business in a street engine. Not because it doesnt work, but because one can spend so much effort, expense, and time on the race stuff, that some of the major parts get overlooked. My point was, that the info posted would show a fully ported set of 915s will outflow a set of well done Indybrocks. That to me, misleads athe guy who is taking his 360, adding a 4" crank, and having his local shop "port" the heads. He will spend well beyond the price of stock edelbrocks cleaned up and checked. And, I'd wager that in 80% of the shops that say they can/would do it, the flow numbers will not be close to what BJR posted. Maybe 10% will come close to them, but that's a seriously OUTSTANDING job to get them to go 285cfm with a 1.88 valve. Some shops will flat out say no. That was my point. Not "you're a looser", "you're a poser", "I know more than you.." or anything like that. Just a few things I found could be misunderstood easily, or seem out of place.