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They don’t provide them because they don’t have a flow bench. I do know people/customers who have had them flowed by a 3rd party...

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I wouldn’t agree with that if you’re after a high end ported head neither would be considered to fit that category but the ppf while bare seems a better option than the BH touring.

The...

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roughly hp potential = 1.65 x cfm (for a 6 cyl based on 2.2hp per cfm for a v8)

so stock head taps out at 275bhp (220-230whp) and ported 355bhp (293 to 302whp) assuming 15-17.5% drivertrain....

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The as delivered AMC head flows like dogshit so that is a good improvement over that. However compared to a stock bmw cast 885 it is a very modest improvement on the inlet side given +1mm valves and seems...

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This is the head that TK did for mine but with a better valve shape than what they were when TK flowed it. i never really liked the valves i got from VAC that i supplied to Tony so i changed them out...

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DId a booster and m/c swap along with 300mm/de BBK.


-Year and model of your E30: 89 325is RHD vehicle

-Intake manifold used in swap: m20 RHD ITB setup with own custom...

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TK (Tony Knight) Knight Engines is in South Australia so even for me like 1,000km. Rama (RHD) has a digitised port that is very good (need to ship a good checked core) and Grooty also does porting and...

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I found some old images

Rob 2.8 348 whp




A 2.8 with 306whp (tk head)




Rama 2.9L 294whp


Rama 2.7L 731...

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I would do +2mm 44mm Inlet stock 36 exhaust. There is no need for +1 exhaust valve

do you have a build thread.? Most ported heads are no better than stock. I bought one from a well known...

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I’m going by dyno dynamics (most common around these parts) 250rwhp vs 300bhp which is 17%

haven’t directly seen a 300bhp dyno but I will dig out records and by extension its very doable....

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Yeah it’s pointless using bigger valves without machining the throat to suit and also blending to the bowl and reprofiling the short side etc

you don’t need a roller rocker setup as the...

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It adds unknowns when comparing against roller dyno that provide whp readings and roller dyno that measure whp and do a coastdown correction to bhp like done in most of Europe. You would think that they...

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Hub dynos just add another unkown variable and are a waste of time on a NA m20 as there are no traction issues on the roller therefore the extra labour cost is a mostly a waste IMO

Theory...

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300bhp is probably 350rwhp depending on dyno in question.

Are you referring to a streetable m20 engine or m20 in general? For radical valve train I’m referring to cam duration. The roller...

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300bhp is easily doable it’s just the head work is expensive but can be done streetable. Can be done with not so radical valve train to.

300whp which is the unit of measure most rely on...

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Yes, one at a time following the sequence. Back it off so that you break the static friction then tighten in a continuous motion under dynamic friction...

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You have to periodically retorque arps with composite gasket. To do this properly you need to back it off some not just turn until it clicks statically...

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IMO easiest way is the push down the end of rocker, you just need a bit of mechanical advantage to push and a bar bolted to the valve cover rail using the studs to react against. it works easily have...

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i setup a lever to push down on the end part of the rocker and see how much it moves before the valve hits the piston. if needed you can bolt something on the pivot on using the valve cover studs

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there is a difference between factory squish clearance vs optimum. it probably matters more for a NA engine as you need all the help you can get