mentor70
Well-Known Member
First off, ive had Indy SRs, and Edelbrock RPMs in the past, and didnt have issues with them out of the box, but i didnt know any better. (i was lucky)
if i were running ANY other aftermarket head in this build, id be doing the same thing, im not picking on 440 source heads, its just what i bought this time around.
Anyway, bought these heads bare last November, fulling knowing stuff like this was going to come up with the experiences ive gained over the years.
First off, 440 source would NOT tell me EXACTLY who they source their valves from, so i didnt want them, and if you upgrade valve springs and retainers, they want you to re-buy them even though you ALREADY bought them, and of course they charger you to swap out the right parts you bought (again) for the parts you bought the first time that dont match the cam you want to run.
next, Hughes engines had a sale on CNC porting last December, so i decided to send them out, Hughes stated recently that the heads were around 84 CCs out of the box, not the 80 CCs advertised.
when i got the heads back, i took them to my local machine shop for final assembly, and inspection.
at this time the combustion chambers were checked again, now at 90 CCs after the CNC port work!!!
they are so big now that running them like this would yield NO advantage performance wise, other than weight savings.
my cam requires 10.5 compression, so milling them to 78 CCs was mandatory.
now this is where it gets good, i know many have bought these heads, and Edelbrocks, Pro comps and the like...and just threw them on and went, but they really need to be blue printed before they are installed.
the pix show my heads as a VERY light cut was taken, and it revealed a .004 low spot on both heads, wow, but i was expecting this!...yep not surprised at all.
.050 had to be removed from both heads to correct the compression to make my engine 10.5 to 1.
if you just throw parts on out of the box, dont be surprised if your engine is less than peppy!
this has been public service announcement from Dirty Mormon Racing, thank you.
.
if i were running ANY other aftermarket head in this build, id be doing the same thing, im not picking on 440 source heads, its just what i bought this time around.
Anyway, bought these heads bare last November, fulling knowing stuff like this was going to come up with the experiences ive gained over the years.
First off, 440 source would NOT tell me EXACTLY who they source their valves from, so i didnt want them, and if you upgrade valve springs and retainers, they want you to re-buy them even though you ALREADY bought them, and of course they charger you to swap out the right parts you bought (again) for the parts you bought the first time that dont match the cam you want to run.
next, Hughes engines had a sale on CNC porting last December, so i decided to send them out, Hughes stated recently that the heads were around 84 CCs out of the box, not the 80 CCs advertised.
when i got the heads back, i took them to my local machine shop for final assembly, and inspection.
at this time the combustion chambers were checked again, now at 90 CCs after the CNC port work!!!
they are so big now that running them like this would yield NO advantage performance wise, other than weight savings.
my cam requires 10.5 compression, so milling them to 78 CCs was mandatory.
now this is where it gets good, i know many have bought these heads, and Edelbrocks, Pro comps and the like...and just threw them on and went, but they really need to be blue printed before they are installed.
the pix show my heads as a VERY light cut was taken, and it revealed a .004 low spot on both heads, wow, but i was expecting this!...yep not surprised at all.
.050 had to be removed from both heads to correct the compression to make my engine 10.5 to 1.
if you just throw parts on out of the box, dont be surprised if your engine is less than peppy!
this has been public service announcement from Dirty Mormon Racing, thank you.
.
For the budget builder these are a good deal. I can only imagine sending them out and then getting them back just find most of the aluminum had been worked away lmao so much so they are now not usable? sounds like a refund is in order?
