J (915) vs. Magnum heads
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Unless he is using stock mag springs, which in that case he would need new springs if putting a real cam in anyways, he could swap them over.
So your point is ?
[/QUOTE]Head bolts, what I think its only a couple that are shorter?[/QUOTE]
Try buying just those 2 bolts alone. Good luck.
[/QUOTE]According to everyone on this site, minus you, the valve covers interchange.[/QUOTE]
I've got a Magnum head and an LA Mickey Thompson cover right here in front of me. They bolt on but, the gasket flange on the ends doesn't align. You can see right up into the head through the upper corner of the cover. They they might work with a wide and thick enough gasket, but questionable at best.
[/QUOTE].020 would even them up, thats about $65-90 for the pair.[/QUOTE]
To even up the chamber volume 72ish cc for the J, 64ish for the Magnum one would need to mill .048 at 1cc per .006" milled. Another expense to gain nothing.
[/QUOTE]Other than rocker gear in which the j's shaft mount is better, and chamber...they arent much diff. [/QUOTE]
The OEM LA rockers suck. They are weak and ratio inaccurate. The shaft mounting is a real plus though, but unless turning some high RPM with lots of spring pressure the advantage is insignificant. The chamber in the Magnum light years ahead of the LA.
[/QUOTE]If you do your homework you will find that the mag has a few more cfm in stock form in the .200-.300 lift range, otherwise the j heads flow more and are better suited for a higher lift camshaft.[/QUOTE]
I've yet to see a stock J head that flowed better than a Magnum. The difference isn't drastic though.
[/QUOTE]In the performance world where every part is pretty much messed with to make more power, I dont see enough return investment in messing with Magnum heads.
I do think that if the op is cruising a stock/next to stock mill that the magnum head is fine.[/QUOTE]
This is my point exactly. Why spend a bunch of money and time to gain nothing or likely go backwards. To swap to the LA heads would wind up costing him over a thousand $ by the time the things I stated were addressed.
[/QUOTE]Unless they are ported, its almost apples to apples but with one of the apples having crack indusive worms.[/QUOTE]
Take it from the guy that does the Magnufluxing, both heads have an equal tendency to crack.
