buick 300 heads vs rover stage 4

[kokkolanpoika]

Hi..

How mutch better are buick 300 64- alloy heads that rover stage 4 heads, if both heads are fully ported and same size valves 43/38..?
I´m thinkink to puy couple of buick 300 heads, but purchase is open still.
My engine is 4,6Efi maybe next or next.. summer 5,3Efi.
Can someone estimate power figures both heads for 4,6engine..
Cam is Kent H214. CR near 10-10,5:1.
i´m thinking to get about +320-330hp those stage 4heads..?

[v8man]

just get the new real steel heads for the rover a
lot nicer

[kokkolanpoika]

just get the new real steel heads for the rover a
lot nicer

Hmm Can you tell me more of those heads? Price, how big valves? Any flow data? + more..

[v8man]

just give them a call

price is around £1000.00 not bad lol

http://www.realsteel.co.uk/

[kokkolanpoika]

just give them a call

price is around £1000.00 not bad lol

http://www.realsteel.co.uk/

Thanks. I send them e-mail. I don´t speak very good English. I hope they will answer my e-mail?

Is it possible that you tell me more those heads?

[Robrover]

I haven't seen or experienced the new RS heads but I'd be interested to see the flow figures on them.

If you look at my posts on the old forum (do a search on Buick 300) you'll see what these heads are capable of (mine will potentially support 410bhp), which is sort of mid way between a good set of flowed b/v Rover heads and the mega buck Wildcat ones.

The heads themselves are realtively inexpensive if you can located a pair. The cost comes in getting them flowed and ported, etc (around AUD1800).

Be aware that these heads have bigger combustion chambers so you'll need to either fit higher comp pistons (Rover 4.0 litre for example) or weld the chambers up to reduce their volume and fit tin gaskets.

[Wotland]

Hi,

Some flow bench datas :

Valve Lift --Buick 300 In. valve 1.775--Buick 300 Exh. valve 1.500
0.100................... 66....................................... 47
0.150................... 99....................................... 82
0.200................. 129...................................... 104
0.250................. 155...................................... 119
0.300................. 174...................................... 130
0.350................. 187...................................... 139
0.400................. 191...................................... 146
0.450 .................194.............................. ........ 150
0.500................. 196...................................... 152
0.550................. 200...................................... 153

Valve lift--Rover genuine In valve 1.575--Rover genuine Exh. valve 1.350
0.200................. 92.2..................................... 72.2
0.300................ 132.6..................................... 85.7
0.400................ 143.3..................................... 89.5
0.450 ................145.7............................. ........ 90.5
0.500................ 147.7 .....................................91.3
0.550................ 148........................................ 91.6

Valve lift--Rover Stage4 In. valve 1.700--Rover Stage4 Exh. valve 1.500
0.200................ 101.4 .....................................80.1
0.300................ 143.9 ....................................106.6
0.400................ 177.1 ....................................127
0.450................ 180.6 ....................................134.3
0.500................ 181 .......................................139.7
0.550................ 181 .......................................142.8

[kokkolanpoika]

Hi,

Some flow bench datas :

Valve Lift --Buick 300 In. valve 1.775--Buick 300 Exh. valve 1.500
0.100................... 66....................................... 47
0.150................... 99....................................... 82
0.200................. 129...................................... 104
0.250................. 155...................................... 119
0.300................. 174...................................... 130
0.350................. 187...................................... 139
0.400................. 191...................................... 146
0.450 .................194.............................. ........ 150
0.500................. 196...................................... 152
0.550................. 200...................................... 153

Valve lift--Rover genuine In valve 1.575--Rover genuine Exh. valve 1.350
0.200................. 92.2..................................... 72.2
0.300................ 132.6..................................... 85.7
0.400................ 143.3..................................... 89.5
0.450 ................145.7............................. ........ 90.5
0.500................ 147.7 .....................................91.3
0.550................ 148........................................ 91.6

Valve lift--Rover Stage4 In. valve 1.700--Rover Stage4 Exh. valve 1.500
0.200................ 101.4 .....................................80.1
0.300................ 143.9 ....................................106.6
0.400................ 177.1 ....................................127
0.450................ 180.6 ....................................134.3
0.500................ 181 .......................................139.7
0.550................ 181 .......................................142.8

Hi..
Are those buick 300 heads ported or std? I think ported?
If i remember right, my cam has got 11,9-12,3mm lift. And 13,97mm is too mutch for me.
What about flow speed those heads, in my mind the flow figures dont tell everythink, also flow speed is important? And this flow bench test is theoritical power. In real life it´s not as simple as theory.? I´m i right?

[HairbearTE]

kokkolanpoika you are right. Flowbench figures on their own only tell part of the story. The design of the inlet tract as a whole must be taken into consideration when building for power. Too much port cross section area and you will lose velocity. Losing velocity of the inlet charge reduces the engines ability to fill the cylinder. A basic flowbench can tell you the ultimate potential to flow air of any head but it wont tell you that the head is too much for your engine! Interestinly you can now get various attachments to use with a flowbench that measure air speed and also even measure swirl! How effective these items are i dont know and i dont know how many UK bench tester are using them. I also read recently about a cylinder head manufacturer in the states using a "wet flow" bench where a mixture similar in nature to an air fuel mixture is used to better simulate the conditions in the engine and therefore give data that will be more accurate and enable the company to produce better heads. Again, i doubt this is available in the UK yet, and if it is i very much doubt a rover head has ever been let anywhere near it! I have started to build my own basic flowbench in my workshop using amongst other bits: 2x henry vacuum cleaner motors, some gas pipe, a piece of kitchen worktop and other assorted bits of wood, and a cylinder liner for a 3.9! Another hairbear abomination is in the offing! wish me luck

[kokkolanpoika]

Good luck HairbearTe You are engineer

My theory.
When the heads are in the engine, and engine run/piston move up and down. There is a vacuum and also back pressure in inlet and exchaust port, this disturb flowing. I think every heads in flow bench are tested "std over" pressure, not back pressure at all.. Too dificult explain, but i know theory..

My friend has got Ford Escort 75- 2.0 8valve programmable Efi/ignition. He made over 10 heads for racing, and all heads are tested in flow bench, they usually flow about+200-230hp (i dont remember correckt figures) with huge ports, but one head flow about 177hp and ports are almoust same size as std ports, very small. Engine make 236Hp @9600rpm with this small port head.
When he put those huge port head what flow about +200hp then engine make 210Hp all other settings are same, but injecktion/ignition system is programmed to suit this new head.
He say just that flow benc shows theoritical power, but it wont work when heads are in engine, because piston move all the time and disturb flowing..
I think my Friend Escort is Finnish moust poverful 8valve Escort? Not sure, but i think?

Easier explain in Finnish

[Wotland]

Here some experiences about buick 300 heads porting :
http://www.leylandp76.com/technical/tech-headflow.html
http://www.leylandp76.com/technical/tec ... heads.html

[Richard]

Speaking of flow benches, has anyone had experience with Performance Trends flowbench gear?