mast heads, arent they similar to another head
02-01-2022, 10:23 AM
#1
mast heads, arent they similar to another head if i recall seeing on here before, mast is sorta like american racing headers, some kooks headers employees decided to go out on their own and form american racing. i thought i saw mast and all pro castings were similar.....can anyone confirm or deny this?
02-01-2022, 11:33 AM
#2
On The Tree
ETP (Cary) sold to MAST which was rebranded. MAST heads are their own thing. All of the employees just did their own thing that the NDA allowed them to do.
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G Atsma (02-01-2022)
02-01-2022, 03:50 PM
#4
TECH Senior Member
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JRFed (02-01-2022)
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Corona (02-01-2022)
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02-01-2022, 05:42 PM
#9
Architecture and geometry probably are the same... port Cnc differs 12 degrees stays the same. There's only a few Foundries that cast heads ...ProFiler produces CID heads....From uncle Chad who got them straight from ProFiler.
02-02-2022, 09:38 PM
#10
The Promaxx small bore heads are very similar, if not the same casting, as the MAST heads.
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Corona (02-02-2022)
02-02-2022, 10:56 PM
#11
02-07-2022, 02:59 PM
#13
Last edited by Corona; 02-07-2022 at 03:07 PM.
02-07-2022, 03:08 PM
#15
02-07-2022, 03:11 PM
#16
Reason a person buys a Promaxx head is to save money with a good porter on stand by. Perfectly Sized heads for less than TFS or the big names.
buy as cast 👍 or send out the cnc version for a little work
buy as cast 👍 or send out the cnc version for a little work
Last edited by Corona; 02-07-2022 at 03:21 PM.
02-07-2022, 06:05 PM
#18
Has NOTHING to do with porting.
Not a good idea to waste money having promax heads ported. If you are going to buy them and port them set aside money for new valves, valve seats and guides, and time-sert all the rocker bolt holes... or just buy a proper set of heads.
Out of the box they "looked" ok and made decent power on the dyno. However, and a big HOWEVER that power didn't last since the leakdown went to **** because the valve seats fell apart in a matter of weeks. Then to top it off since the casting material is junk the rocker threads also ripped out. Guys on other forums have had same issue, so doesnt seem like a one off case. For comparison one of my engines has had DART heads on it for 15 years and not had a single issue with them, works out to be about the same price or maybe even cheaper once you sort out all the issues on the promax.
Out of the box they "looked" ok and made decent power on the dyno. However, and a big HOWEVER that power didn't last since the leakdown went to **** because the valve seats fell apart in a matter of weeks. Then to top it off since the casting material is junk the rocker threads also ripped out. Guys on other forums have had same issue, so doesnt seem like a one off case. For comparison one of my engines has had DART heads on it for 15 years and not had a single issue with them, works out to be about the same price or maybe even cheaper once you sort out all the issues on the promax.
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02-07-2022, 07:23 PM
#20
Has NOTHING to do with porting.
Not a good idea to waste money having promax heads ported. If you are going to buy them and port them set aside money for new valves, valve seats and guides, and time-sert all the rocker bolt holes... or just buy a proper set of heads.
Out of the box they "looked" ok and made decent power on the dyno. However, and a big HOWEVER that power didn't last since the leakdown went to **** because the valve seats fell apart in a matter of weeks. Then to top it off since the casting material is junk the rocker threads also ripped out. Guys on other forums have had same issue, so doesnt seem like a one off case. For comparison one of my engines has had DART heads on it for 15 years and not had a single issue with them, works out to be about the same price or maybe even cheaper once you sort out all the issues on the promax.
Not a good idea to waste money having promax heads ported. If you are going to buy them and port them set aside money for new valves, valve seats and guides, and time-sert all the rocker bolt holes... or just buy a proper set of heads.
Out of the box they "looked" ok and made decent power on the dyno. However, and a big HOWEVER that power didn't last since the leakdown went to **** because the valve seats fell apart in a matter of weeks. Then to top it off since the casting material is junk the rocker threads also ripped out. Guys on other forums have had same issue, so doesnt seem like a one off case. For comparison one of my engines has had DART heads on it for 15 years and not had a single issue with them, works out to be about the same price or maybe even cheaper once you sort out all the issues on the promax.
Generally tend to go bigger or better on P's OS... nothings otb.