Other than weight savings and the ability to inhibit detonation, do today's aluminum heads really flow substantially more than a good set of 990 heads?
Merlin's, is that because they are an older design or?Newer heads not only flow more, but have better port and bowl shapes, cross sectional areas, , combustion chamber design, and some are developed with wet flow. Note: Merlin's are kind of excluded from this list, although a little better than stock.
Most, not all, have raised exhaust ports and some raised intake ports.
Alot has been learned since the 60's/70's.
here's my flow specs from my 990's when i had them flowed.
My heads had minor port work and the intake valves are 2.25"
That's what I was looking for! Some flow numbers to compare to.
I've checked out your build pics. Nice Job!
Yeah, She kinda forced me into it with the oil pump taking a dump on me.Hey Jeff! Finally pulling the mill to refreshen her up
I would def step up in cam. You can achieve more with a better cam. Contact chris Straub on here and he can set you very straight with a nasty cam kit that will scare you!!!!! Talk with him about your top end kit I promise that you will be very happy
Any question about which "out of the box" oil pump to use?.............MPYeah, She kinda forced me into it with the oil pump taking a dump on me.
It's been a nice strong and reliable motor for years. Time to step up though....
Thanks for the info!
Any question about which "out of the box" oil pump to use?.............MP
Curious, are they 049's???..Just keep in mind engine size and intended RPM.
More flow is not always better. Beyond a point, it will hurt you.
Here is a VERY hard running set of factory irons:
2.19" intakes, 1.80" exhausts, on 11/32" stems
Lift ---- Int----Ex
.050 -- 31.8 -- 26.1
.100 -- 67.2 -- 56.8
.200 - 146.3 - 113.0
.300 - 221.9 - 147.0
.400 - 270.7 - 176.6
.450 - 277.0 - 189.8
.500 - 283.4 - 198.6
.550 - 291.8 - 201.9
.600 - 297.0 - 203.0
.650 - 297.0 . 204.1
That's better than 990's from the box, and mine are not rectangles, never were.
Those produced a VERY hard running 454 that otherwise is "handicapped" by 8:1 compression and a hydraulic cam (and 1 too-small carb on a dual-plane Perf. RPM Air Gap intake).
It makes 500HP at 5,400RPM, Aggressor B impeller in a Berk F, no inducer (but now blows the pump dry if I stomp it from idle (never did that before)).
Spun her to 5,900 with the big nitrous jets 2 weeks ago teaching a TX driver a thing ot 2. LOL
Just don't go TOO big looking at head flow unless you have a huge motor or intend to spin huge RPM.
Something that fits will work wonders, something that does not, will require duct tape and bailing wire.