The V8 Owners Forum -

I thought I'd share some numbers for a set of TA Rover heads I had on a flow bench recently. The heads were first flowed in unported form and then ported by Bob Stiegemeier of Stiegemeier Porting Service (http://stiegemeier.com/) in St. Charles, Missouri USA. In addition to the heads, I dropped off ...

> If the rover v8 is Buick engine would a Buick v8 fit on to the rover gearbox ? The Buick 215 aluminum V8 uses a "dog ear" bellhousing pattern not shared by later 1964-up GM engines, including other Buick V8s. The 1962 and 1963 Buick V6 also used this bellhousing pattern but switched to t...

> The TA Trs heads were not ported just removed very slight casting flash and machining marks. > Also they were tested in a 94mm bore. Ah, that explains it. You had me worried the CNC ported version was only flowing 184 CFM peak @ 28". TA claims they flow approximately 225 CFM intake and 140 ex...

So that means the TRS CNC ported TA Rover heads flow around 184 CFM at 28" through a 1.94" intake valve. Is that an average flow or peak value?

Dan Jones

What pressure drop (e.g. 10", 25", 28") were these heads measured at?

Thanks,
Dan Jones

> Out of interest do you have details of the rocker gear? They are oilite bronze bushed Harland Sharp roller tip rockers on standard shafts from TSI: http://www.tsimportedautomotive.com/tr7_tr8.html They go for $425 USD per set. Since the rockers have a wider body than the OEM rockers, the shaft spr...

> this upgrade will involve 300 heads which I am acquiring, but which valves would you guys recommend to put in them? I used 6000 Series Ferrea Buick V6 Stage 1 valves in my ported Buick 300 heads. The intake valves used are part number F6238 (1.775" head diameter, 11/32" stem, 4.735"...

Vacuum secondary Holleys have an accelerator pump on the primary side only. Mechanical secondary Holleys have a second accelerator pump (double pumpers) to inject additional fuel into the secondaries during transient throttle openings. When you open the throttle plates, fuel lags behind the airflow ...

> hows the new 4.3? Rover project with the Mickey Thompson heads coming along? The Mickey Thompson heads have a really strong exhaust port compared to the intake port. It's really a matter of the intake valve needing to be larger. If I increased them to the 1.775" (like the Buick V6 valves in t...

A while back I ran the numbers for switching from an iron to aluminum flywheel for my Triumph TR8 with Rover V8. The effect was surprisingly large. There are a couple of approaches to doing the math. The more rigorous approach is to calculate the polar moment of inertia for the two different flywhee...

Thanks Mark. I was sent some info with dimensions that will probably be
enough for my purposes.

Thanks Again,
Dan Jones

I'd guess your heads are probably a bit better than the light port Buick 300 flow numbers, particularly on the exhaust side where you have a larger valve but not as good as the Stage 4 Rover 3.9L numbers.

Dan Jones

> Its a pity that the test depression is not stated as without it the figures > do not mean very much but hopefuly that will become apparent in due course, > however from the work done on the bench today it would look like the figures > are at 28" or above The flow numbers for the ported Buick ...

> Here you go from the Merlin head post - thanks to V8bloke Thanks for the Merlin pictures. Any chance I could get you to take some measurements? I've recently updated to the latest version of Dynomation and am building a Rover/Buick simulation database. I've gotten pretty good results with the prog...