The Great Pumpkin - '71 Duster
When I bought the RHS heads back in 2013, I was against aluminum heads. It was similar to how people like to prove a point by building up a Slant 6 or 318 - sure it can be done but just doesn't make a whole lot of sense when looking at it from a cost/performance standpoint. In the end, you end up with something that's no better than an average build with a better foundation.
I have no reasonable explanation for why I held on to that idea and I've since come to believe that aluminum heads are superior. That choice did cost me time and money though since save for a few dyno runs in 2014, the heads just sat unused.
The IMM/RHS are awesome heads though. They flow just about 300cfm on the intake side and made 500hp/500lbft of torque in my 416" with a 251 @ .050" solid F.T. cam. Problem is they are HEAVY. Like, REALLY heavy. They will get used eventually so I'm going to hang onto them but that's a project for another day.
The W2s came off a long time ago, it’s been about ten years at this point. After I bought the RHS, I sold all my W2 stuff at Carlisle - heads (#810), valves, pushrods, two intakes, Harland Sharp rockers, shafts and hold downs… all of it. I made decent money but part of me regrets doing that since it would cost a small fortune to buy it all back now.
The W2s needed work though. They weren’t cracked or anything but they were old and worn. The bowls had been touched up a little but they were nowhere near their ultimate potential. I never flowed them but I have no doubt the RHS were much better. Sure, they could have been monsters had I chosen to get them worked on but at the time I just didn’t want to sink a bunch of money into them so down the road they went.
The aluminum heads I have now flow a LOT of air. The ports are works of art. Plus, they have to be 50lbs lighter than iron heads and allow for almost a point more compression. They also don't require offset rockers so I saved money transferring the rocker gear from the RHS heads. As they say, it was a win-win deal.
BPE.
The BPE's are replacing my IMM CNC ported RHS/Indy-X heads.
When I bought the RHS heads back in 2013, I was against aluminum heads. It was similar to how people like to prove a point by building up a Slant 6 or 318 - sure it can be done but just doesn't make a whole lot of sense when looking at it from a cost/performance standpoint. In the end, you end up with something that's no better than an average build with a better foundation.
I have no reasonable explanation for why I held on to that idea and I've since come to believe that aluminum heads are superior. That choice did cost me time and money though since save for a few dyno runs in 2014, the heads just sat unused.
The IMM/RHS are awesome heads though. They flow just about 300cfm on the intake side and made 500hp/500lbft of torque in my 416" with a 251 @ .050" solid F.T. cam. Problem is they are HEAVY. Like, REALLY heavy. They will get used eventually so I'm going to hang onto them but that's a project for another day.
The W2s came off a long time ago, it’s been about ten years at this point. After I bought the RHS, I sold all my W2 stuff at Carlisle - heads (#810), valves, pushrods, two intakes, Harland Sharp rockers, shafts and hold downs… all of it. I made decent money but part of me regrets doing that since it would cost a small fortune to buy it all back now.
The W2s needed work though. They weren’t cracked or anything but they were old and worn. The bowls had been touched up a little but they were nowhere near their ultimate potential. I never flowed them but I have no doubt the RHS were much better. Sure, they could have been monsters had I chosen to get them worked on but at the time I just didn’t want to sink a bunch of money into them so down the road they went.
The aluminum heads I have now flow a LOT of air. The ports are works of art. Plus, they have to be 50lbs lighter than iron heads and allow for almost a point more compression. They also don't require offset rockers so I saved money transferring the rocker gear from the RHS heads. As they say, it was a win-win deal.
