Speedmaster/Procomp Heads - New combo kit???

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mshred said:
Anybody else try a set of these heads? Is there a shop that is selling them complete, checked out and with decent valvesprings, retainers, locks, etc. for an semi to aggressive flat tappet cam???

Cant find anything on ebay
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They pop up every now and again on ebay. Keep checking every couple of days. I'm going to get a set of these with my next tax return.
 
Thanatos340 said:


What you describe is exactly what I will be putting these heads on (.030 over 340). As for Bolt and Go, I have not yet seen any reason why you could not but I am still skeptical and will double check everything first. Especially the valve springs as I will be running a fair stout cam (Lunati - [FONT=Arial, Helvetica, sans-serif]Duration 276/284, Lift .513/.533). Also like others have said, Gotta check the piston height and use the right thickness head gasket.

As for how these compare to stock X Heads?? I strongly believe they will flow MUCH better and deliver a lot more horse power. I do plan on buying some Dyno time once everything is all together. I do happen to have a fresh set of X Heads, A set of J heads with 2.02`s and a set of older econo W2`s all sitting on the shelf. I wish I had the time and money to do a side by side on all 4 set[/FONT][FONT=Arial, Helvetica, sans-serif]s but that is pretty unlikely.
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Anything new on those heads??
 
j par said:
And it shows he was on the Forum Wednesday so those Speedmaster heads should have some serious miles on them now...?
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I still pop in here from time to time. Sorry I never really followed up in this thread from 5 years ago.

Was really shocked to see that horrible video I did 5 years ago now has over 34,000 views on Youtube. (Need to tell Speedmaster they owe me a discount next time I order from them. LOL)

The heads worked out great. Made great power on the 408 short block I put them on. My Machine shop didn't find any issues with them. Everything checked out and they went on just like they came out of the box.

I was more than happy with the HP it was making but never did get it on a dyno like I had planned. Only problem I had with that build was I could never get the power to the ground with the stock suspension. It would get loose every time you got in it.

After I finished the build ended up selling that Duster (Like an Idiot, I will always regret selling that one) as I found an all original 340 TX9 Cuda that I had to have. Later sold that car and now have a 440 Duster.

As to how they hold up over the years, I can't say as the car has been sold a couple times since it left me and I don't know who has it now.

If I could find that same deal again, I would take it in a heartbeat. I got a set of CNC Ported Aluminum Heads complete, Air Gap Clone Intake, 950 Billet Carb and Cheap China Rocker arms all for under $1,300. Sold the Carb for $400 and the Rockers for $150. That put me at $750 for a set of CNC Ported Aluminum Heads and Air Gap Intake. I then sold the J Heads and Intake that came off the Motor for $500 so the whole upgrade actually cost me $250 out of pocket. Talk about Bang for the Buck!

Hell yes it was worth it. Would buy them again (And have bought another set last year for a 340 I have sitting on a motor stand right now when Speedmaster offered a 30% sale at the end of the year. I think I was about $790 to my doorstep on those thanks to the sale).

I am rebuilding the 440 out of my current Duster now and will be giving the 440 Source Aluminum heads a try on that one.
 
abdywgn said:
are the rocker shaft bolt holes heli-coiled?
are the rocker shafts oiled the std. LA way? site says thru pushrod.
are these the same heads that are in EngineMasters magazine ported by Dr.J's Performance?
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Yes they are, but i did have some trouble with the helicoils some of them had a bad installation from factory and its LA style.
//Rob
 
Thanatos340 said:
There are no Flow numbers on the website. I hope to find a local shop that can check them out for me once they come in. I will pay to get them put on a flow bench and also have them checked over completely before they get put on (Still hoping someone can point me towards a good local machine shop that does performance head work). I will post all the results.

I believe that these are the exact same Procomp heads that are discussed here: Latest 408 from MRL Performance

I am expecting to have to put some more money in these heads before they get bolted on but I am thinking that selling off some of the parts from this kit that I dont want like the carb (950cfm is a little much for my motor) will go a long way towards paying that off.
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Hi there,here you have some Flow info of my heads and picture.... https://New in here need some advice SB 360 Cam selectionwww.forabodiesonly.com/mopar/threads/new-in-here-need-some-advice-sb-360-cam-selection.384223/page-3

Observe that these one Flow better then a pair of stock Rpm heads becouse a good 5 angle valve job.. Done in Sweden

best regards.
Rob
 
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