boring my 318
I bought my "...302" heads from aerohead racing, a division of Indy cylinder head.
http://www.aeroheadracing.com/id6.html
I ordered them with the 1.88/1.60 valves ( as advertised ) a back-cut on the intake, and hardened seats. With shipping, they were $600 even.
The "...302" casting heads are the same configuration as earlier heads, as far as intake, exhaust and valvetrain are concerned. The major difference is the size and shape of the "swirl port" combustion chambers.
If you want to use Magnum heads, I believe Hughes or Mancini sells a kit to change to oil through AMC style pushrods, and you have couple options for rocker arms, as the geometry is different ( closer to 1.6 than the 1.5 of earlier heads/rockers ). The exhaust will be close enough to bolt on the Magnum heads, but the intake bolts are different, so you will need to buy a Magnum specific manifold, or have your heads or manifold redrilled.
The only bad thing about the "...302"s are that they have smog ports, so that you need to drill ( slightly ) and tap with a 1/4 20 and screw in some allen set-screws to plug them up. But "...302"s are $$, while Magnums are $$$$, especially after spending more for a different or modified intake and valvetrain.
Check out this link on swapping to flat top KB pistons:
http://www.carcraft.com/howto/116_0401_318/index.html
They use the Magnum heads in this article, but mention the valves of the "302" being too small. Good luck on the $600 a pair Magnum heads, but you can buy a set of "...302"s from Aerohead with bigger valves for that price. There is newer article that was posted on BigBlockDart.com where someone had built a 400+ hp engine with swirl port heads and the stock hydraulic valvetrain ( also with th KB 167s ).
I bought my "...302" heads from aerohead racing, a division of Indy cylinder head.
http://www.aeroheadracing.com/id6.html
I ordered them with the 1.88/1.60 valves ( as advertised ) a back-cut on the intake, and hardened seats. With shipping, they were $600 even.
The "...302" casting heads are the same configuration as earlier heads, as far as intake, exhaust and valvetrain are concerned. The major difference is the size and shape of the "swirl port" combustion chambers.
If you want to use Magnum heads, I believe Hughes or Mancini sells a kit to change to oil through AMC style pushrods, and you have couple options for rocker arms, as the geometry is different ( closer to 1.6 than the 1.5 of earlier heads/rockers ). The exhaust will be close enough to bolt on the Magnum heads, but the intake bolts are different, so you will need to buy a Magnum specific manifold, or have your heads or manifold redrilled.
The only bad thing about the "...302"s are that they have smog ports, so that you need to drill ( slightly ) and tap with a 1/4 20 and screw in some allen set-screws to plug them up. But "...302"s are $$, while Magnums are $$$$, especially after spending more for a different or modified intake and valvetrain.
Check out this link on swapping to flat top KB pistons:
http://www.carcraft.com/howto/116_0401_318/index.html
They use the Magnum heads in this article, but mention the valves of the "302" being too small. Good luck on the $600 a pair Magnum heads, but you can buy a set of "...302"s from Aerohead with bigger valves for that price. There is newer article that was posted on BigBlockDart.com where someone had built a 400+ hp engine with swirl port heads and the stock hydraulic valvetrain ( also with th KB 167s ).