*PICS* Lt1 Hsr Design
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The 2nd would be for mild H/C packages,heads that flow under 275cfm. Minor port work and machining would make it some what more expensive.
The 3rd will be for the bigger displacement and F/I.This will be where we hog this intake out for maximum flow. That will be the more expensive option.
Now with each version there will be more options. For example, someone may have LT4 heads, we add material and match them. Someone may want the coolant crossover/thermostat hole removed, pcv provisions, and there will be a few others.
One thing we will definitely need are what heads you have and the flow #s. We want to give the heads all the air they can handle.There's nothing worse than having heads that flow 300cfm and getting an intake manifold that gives them 275.
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Have you finalized the operating range, and the power gains yet? Does it fall below anywhere the stock LT1 intake that would really make any difference?
Would you be able to keep the processes written down or whatever for each stage of intake so they can be followed to a T if so would we be able to "upgrade" later down the road for a fee?
Would you be able to keep the processes written down or whatever for each stage of intake so they can be followed to a T if so would we be able to "upgrade" later down the road for a fee?
have you really flowed this thing out the box? i've been curious about the claims that it flows 275cfm. I have no idea where that figure came from. Its on stealthram.com and thats the only place i've ever seen that has numbers on the HSR. Just want to be sure its really 275cfm. i dont think thats right since the cross section out the box isnt even a 1205 port. i ported mine out to fit AFR's port which is about 1205 sized
FWIW, my hsr and 230 degrees on the intake side of the cam has peaked at 6300 rpms on my 383. your power band will STILL be high. maybe not quite the 6700 rpm screamer on some setups but you dont need to go that high. HSR will support up to 6500 rpms easily on bigger inch setups like 383-396.
FWIW, my hsr and 230 degrees on the intake side of the cam has peaked at 6300 rpms on my 383. your power band will STILL be high. maybe not quite the 6700 rpm screamer on some setups but you dont need to go that high. HSR will support up to 6500 rpms easily on bigger inch setups like 383-396.
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The stock/bolt-on version Im thinking $7XX. The other 2 its hard to tell because of the different amount of port work for each one. We could take $40-$60 off if we could get a group purchase from Holley. I dont think that will be a problem though.
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Have you finalized the operating range, and the power gains yet? Does it fall below anywhere the stock LT1 intake that would really make any difference?
Would you be able to keep the processes written down or whatever for each stage of intake so they can be followed to a T if so would we be able to "upgrade" later down the road for a fee?
Would you be able to keep the processes written down or whatever for each stage of intake so they can be followed to a T if so would we be able to "upgrade" later down the road for a fee?
We've been data logging just about everything. Makes it easier on us, it gets rid of the guess work. We are starting with the 'stock/bolt-on' version cause thats the one we are unsure about. We know the HSR will benefit those that require more air flow due to larger heads, cam, or F/I. Stock doesn't require that much more air so we are depending on the longer runners and design of the runners to increase torque and power in the rpm range.
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have you really flowed this thing out the box? i've been curious about the claims that it flows 275cfm. I have no idea where that figure came from. Its on stealthram.com and thats the only place i've ever seen that has numbers on the HSR. Just want to be sure its really 275cfm. i dont think thats right since the cross section out the box isnt even a 1205 port. i ported mine out to fit AFR's port which is about 1205 sized
FWIW, my hsr and 230 degrees on the intake side of the cam has peaked at 6300 rpms on my 383. your power band will STILL be high. maybe not quite the 6700 rpm screamer on some setups but you dont need to go that high. HSR will support up to 6500 rpms easily on bigger inch setups like 383-396.
FWIW, my hsr and 230 degrees on the intake side of the cam has peaked at 6300 rpms on my 383. your power band will STILL be high. maybe not quite the 6700 rpm screamer on some setups but you dont need to go that high. HSR will support up to 6500 rpms easily on bigger inch setups like 383-396.
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Dont know. We are wondering ourselves. We know it will gain lots of torque. HPs the question. When we get the intake done, we have somebody to test it for us and I guess we'll just go from there.
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Would be cool to find a test mule for all 3 stages. At the moment I am interested in the stage 1 intake I cant wait to see numbers! Getting it printed out on those comparable dyno graphs would be awesome to see the difference from stock lt1 and the hsr. Could mail it to Edlebrock after with a tissue enclosed.
