These heads vs stock ported...

3225 Views 5 Replies 5 Participants Last post by YardigansV, Sep 22, 2021

YardigansV

Discussion Starter · Sep 17, 2021

I've been recommended these heads. Any pros or cons vs porting the stock heads?

M311 273cc LS3 Rectangle Cylinder Head-Complete Set | Frankenstein Engine Dynamics

High performance cylinder head and billet intake manifold manufacturer for LS, HEMI, Small and Big Block Chevy platforms. CNC cylinder head porting services. Billet aluminum intake manifold for LS1, LS3, and LS7.

frankensteined.net

Also, if I'm running a cam and ported or upgraded heads, would 90mm Tb do the job or go with the 103mm.

Thanks

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Blades1_99

· #2 · Sep 17, 2021

YardigansV said:
I've been recommended these heads. Any pros or cons vs porting the stock heads?

M311 273cc LS3 Rectangle Cylinder Head-Complete Set | Frankenstein Engine Dynamics

High performance cylinder head and billet intake manifold manufacturer for LS, HEMI, Small and Big Block Chevy platforms. CNC cylinder head porting services. Billet aluminum intake manifold for LS1, LS3, and LS7.

frankensteined.net

Also, if I'm running a cam and ported or upgraded heads, would 90mm Tb do the job or go with the 103mm.

Thanks

I ran my 90 TB quite well, into the Jokerz 1.9. I only went 103 because...well a decent deal.

"Pearl" is a 2011, V Coupe, A6, Recaros, Skyview.

Mods: Airaid - Red filter, Side Swipe, Mamo LS7 Ported TB, ZL1 lid, Fasterproms underhood tank, BMR Catch Can, .... 503whp - 522wtq @ 8 psi boost on 110 Octane
GP Tuning Stg 2 Cam kit with BTR pushrods, springs, timing chain, and trunion upgrade, GripTech 10 bolt 2.45 upper, FIC 1300, WeaponX Track Attack II Heat Exchanger, TSP 2" Ceramic coated w/Hiflow Cats, TR71x, Accel Ceramic wires, DSX 100mm relocated idler, stock IC pump ... 615whp -596wtq @ 10.2 psi boost on 110 Octane... 1/25/20 added DSX flex fuel sensor and CWA 100 IC pump 6/25/20 added ATI Balancer with 8.66 lower. 93 oct 627whp-613tq 40%E blend 652whp-642tq...Xtreme CFM heads Jokerz Supercharger....Feb 25 2021 710whp-645tq on 93, April 2021, DWS 300S, ALM hat, G-force axles on widened coupe wheels 11" running 325s. Sept 2021 swapped to NW 103 with DDP Cold Air Intake System.

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JAustin

· #3 · Sep 17, 2021

The M311 heads are about a million times better than the stock heads as far as performance. They are cast in China and then CNC'd here in the US. They still use the stock size intake valve, but the exhaust valve is a 1.6" I believe and you can upgrade the valves if you want to, but the stainless they come with are pretty good for most applications. The heads have a 3/4" deck, extra provisions for head bolts (useless if you don't have an aftermarket block), Exhaust manifold O-ring grooves (this is amazing BTW). Because they are a taller head, they will require PR length somewhere in the 8.1" range IIRC. The intake and exhaust runners are designed better than a factory head could ever be ported to and because of the additional material in the head, valvetrain stability is increased. All and all, a great cylinder head. By buddy Tom @CSARGUNNER has them. Car has a Magnuson supercharged 7.0L Dart Iron Block setup and his shit grips it and rips it.

Get the 103mm TB for sure.

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Lt1z

· #4 · Sep 17, 2021

Ported stock heads do just as good if done right but those are an option for guys looking to keep downtime to a minimum

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Cduran

· #5 · Sep 21, 2021

My parts guy recommended I get these . I believe porting was roughly 1400 plus shipping . These after marked heads at the time were 2400 if I recall correctly . He suggested I sell my stock heads which I did for around 700 so I ended up getting better heads for I think 300 dlls more over porting .

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YardigansV

Discussion Starter · #6 · Sep 22, 2021

Cduran said:
My parts guy recommended I get these . I believe porting was roughly 1400 plus shipping . These after marked heads at the time were 2400 if I recall correctly . He suggested I sell my stock heads which I did for around 700 so I ended up getting better heads for I think 300 dlls more over porting .

My tuner suggested the same... Thanks for your input man

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