Use the Small Block Chevy 4.910" long valves instead.
Would that not open up a can of geometry worms? Using 4.810 long on the intake and 4.910 on the exhaust?
Use the Small Block Chevy 4.910" long valves instead.
1.75" long studs. You will need the studs that do not have a shank under the hex that locates pushrod guide plates.
That assuming you are still using the 1976 head.
The Stevens HD exhaust manifold is really nice, but I had issues with the mating surface between the intake and exhaust manifold being slightly off:
https://fordsix.com/threads/stevens-hd-exhaust-manifold-port-alignment.73716/
Maybe they've fixed the issue or maybe it mates correctly with their intake manifold.
You can contact Jason at Promaxx Performance and see about a CNC ported head set up for the big valves, shipped without valves and springs since you have your own.
The Promaxx head has the chambers machined out to 73cc which is close to the carb head 76cc.
They are new casting with extra material around the combustion chambers.
They also come with hard valve seat inserts on both the intake and exhaust for the 1.94"/1.60" valves
All Big Six - ProMAXX CNC ported big valve heads are now available.
ProMAXX Performance Products now has CNC ported big valve heads available for the Ford big six. The heads are based on NEW thicker EFI style castings. The combustion chambers are unshrouded to 73 cc using CNC machining. Because of the thicker casting both the intake and exhaust have hard valve...fordsix.com
Your machinist will have to cut some off the stud towers and drill and tap for the studs.
You will need pushrods guides.
For Sale - Stud/Push Rod Guide Plates For 300 Heads
6 pair new (never run) test mounted a few only, Comp Cam sbc #4835 adjustable push rod guide plates welded in a gig for Ford 300 inline 6 heads, I am throwing in the $25 price of the gig welding, Picture 189 is to show how they are mounted, head & studs not included. They are for 7/16” screw in...fordsix.com
Other wise you are looking for another used carburetor head that will need all the work done to it.
Thoughts?
I'm assuming you will have no problem sending the Harland Sharp rockers and ARP studs back.
The camshaft for this project will have relatively low lift so the extra valve lift form the Scorpions rockers will help make power.
Using the scorpions will save you money on machining the towers and buying pushrod guide plates.
I don't know of anything presently from Crane that will work.
Have you ordered a cam yet?
This one in the Crower catalog has the most similar specs to the cam card you posted back at the start of the threadThe only reason the stud mount was preferred is because there are no 1.6 ratio pedestal mount roller rockers
I didn't know that Crower now has a catalog turbo cam.
No.This one in the Crower catalog has the most similar specs to the cam card you posted back at the start of the thread
Ford Hydraulic Flat Tappet Camshaft
Ford - 240 & 300Performance level 3 - High Performance Compu-Pro - Hot street profile. Strong upper bottom and top end power.INT/EXH - Dur @ .050” Lift: 202°/210° RR: 1.6/1.6 Gross Lift: .443”/.448” LSA: 112° RPM: 1800 to 4500 Redline: 5000www.crower.com
YesLooks like I was reading the specs wrong. That cam card, was that a custom grind from Crower? Nothing on their website has those specs.
Yes
That is a custom grind.
You have to call it in and give them the information.
Nice!In other news, my Promaxx head is ordered!