Which Hemi head??

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Justin Smith

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I am in the process of building a 1968 Dart to SS/AH CHASSIS specs, I will not run this class but want to build the chassis close to the specs. I am building a 605 Hemi, Keith black aluminum block, 60mm raised camshaft. I am shooting to make upwards to 1000 to 1100 hp. I am trying to decide which Hemi head would work the best for my combo. I have seen the Indy legend IRA heads and the FHO (For Hemis Only) Stage V hemi heads. Indy's hemi IRA head is what was recommended to me for a heavier car, apparently it makes more torque than the IRA6 head they offer, they said the IRA6 head is more for a lighter car. FHO's Stage V big valve head is similar to Indy's IRA head, flows a little more CFM, then there is the Millenium 2000 head FHO offers, where I hear flows massive amounts of CFM. I don't want to over kill the engine with TOO big a head for what I want to do, but I also want a head that is going perform strong. I'd like to turn E.T.'s of 5.40's in the 1/8th, 8.50's in the quarter. any input or suggestions?

Thanks y'all!
 
Justin Smith said:
I am in the process of building a 1968 Dart to SS/AH CHASSIS specs, I will not run this class but want to build the chassis close to the specs. I am building a 605 Hemi, Keith black aluminum block, 60mm raised camshaft. I am shooting to make upwards to 1000 to 1100 hp. I am trying to decide which Hemi head would work the best for my combo. I have seen the Indy legend IRA heads and the FHO (For Hemis Only) Stage V hemi heads. Indy's hemi IRA head is what was recommended to me for a heavier car, apparently it makes more torque than the IRA6 head they offer, they said the IRA6 head is more for a lighter car. FHO's Stage V big valve head is similar to Indy's IRA head, flows a little more CFM, then there is the Millenium 2000 head FHO offers, where I hear flows massive amounts of CFM. I don't want to over kill the engine with TOO big a head for what I want to do, but I also want a head that is going perform strong. I'd like to turn E.T.'s of 5.40's in the 1/8th, 8.50's in the quarter. any input or suggestions?

Thanks y'all!
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Stage V heads...go Millennium.
 
I hear the Millenium head is a really good head. apparently you can dang near make as much power you want out of them based on camshaft and RPM's you run. I don't plan to run over 8000 RPMs. How do y'all feel about the Stage V rocker arms? I considered those or spending the big dollar for Jesel rockers.
 
I'd imagine the fully prepped stage V Millenium head from FHO is around 8k for just the heads.
 
ou812 said:
I'm a dealer...just sayin. Rockers depends on what you plan is for lift, spring pressure and rpm.
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Cam lift will prolly be upwards to .750 to .800, RPMs will prolly be shy of 8000. Maybe 7600 RPMs give or take
 
I got a set of these D5 heads which were the last of the expeimental stages back in the day. I think they are comparable to B2 heads today but hell, I don't really know a lot about the hemi yet. I was hoping to try and have someone cnc a new set for spares as these have been ported to the max. 2.39s in there. The exhaust have adapter plates on them. Dual plug holes. Like I said tho, I don't know a lot about them yet but they are old and supposed to have come off a dragster motor from Michigan. Im excited to figure it out.

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MerlinsMopar said:
I got a set of these D5 heads which were the last of the expeimental stages back in the day. I think they are comparable to B2 heads today but hell, I don't really know a lot about the hemi yet. I was hoping to try and have someone cnc a new set for spares as these have been ported to the max. 2.39s in there. The exhaust have adapter plates on them. Dual plug holes. Like I said tho, I don't know a lot about them yet but they are old and supposed to have come off a dragster motor from Michigan. Im excited to figure it out.

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Quit screwing w/ it and send it to me , I`ll straighten it out !
 
MerlinsMopar said:
I got a set of these D5 heads which were the last of the expeimental stages back in the day. I think they are comparable to B2 heads today but hell, I don't really know a lot about the hemi yet. I was hoping to try and have someone cnc a new set for spares as these have been ported to the max. 2.39s in there. The exhaust have adapter plates on them. Dual plug holes. Like I said tho, I don't know a lot about them yet but they are old and supposed to have come off a dragster motor from Michigan. Im excited to figure it out.

View attachment 1715631710

View attachment 1715631711
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Competition Series TQ's. NICE!!
 
You need to have oil feed holes in the bushings that will feed the lifters for pushrod oiling.
 
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