Magnum heads on LA block H.p increase

jammied said

Hmmmm I thought X and J heads had 175cc intake runner?

Don't get me wrong. It's been awhile since I had one in front of me but is there a coolant passage between the valves?.

So unported la heads will flow 200cfm just by installing larger valves? Other than big valve X And J heads that do flow 200cfm but through alot larger port.

I did have alot of la 360 heads that were cracked and running coolant into the cylinder.
Guess I would have to see dyno and track numbers cracked vs non cracked. Of course this is if they are cracked between the seats. I have seen Utah awesome on there website dynoed a truck with cracked heads. Still never seen a magnum head leak coolant from the Crack between the seats

Click to expand...

I wish they were 175cc.
Cracks grow up into the bowl where there is water, beyond the seat there is plenty of water in a mopar head. Trust me.lol
The 2.02 versions go over 210 cfm and some as a high as 228cfm
The tulip 2.02 actually eats up more bowl volume than the 1.88 and is about the same bowl size aside for the minor throat plunge front the factory.

Back to the topic..
The mag'em heads will outperform the 302 318 heads no problem and wont lower the compression or gain any either 'as cast'.
It's a worthwhile upgrade if you can $wing all the gear to make it work. In this case just some push rods, the heads & rockers... if or just buy sheistmasters chi'luminum for a few bones if I were trying to save money and don't mind modifying the alt brackets some. Same everything n bolts right up.
A good set of mag based performance heads 'ready to rock' will set you back into the 950-1200 range depending on how you dress them.