bore/stroke question.
10-25-2004, 05:08 AM
#5
Guest
Posts: n/a
RE: bore/stroke question.
Ok I just acquired a pretty nifty little tool here and I have more questions.
the stock GT is 9.4:1 CR. I know that.
~ how big are the intake and exhaust valves? In inches or CMs
~ what kind of manifolds do the GTs use? (single plane, dual plane, tunnel ram, individual runner, etc)
~ what kind of flow does the stock IM put down in CFMs? My guess is either 300 or 400 CFMs, but I dunno.
~ what kind of lifters do they use? hydro flat tappet, solid flat tappet or roller solid/hydro lifters?
~ what kind of lift and duration does the cam produce on the stock valves?
Tryin to calculate what kind of power I could be making with just an overbore and stroker kit on a 4.6
Any help is appreciated.
the stock GT is 9.4:1 CR. I know that.
~ how big are the intake and exhaust valves? In inches or CMs
~ what kind of manifolds do the GTs use? (single plane, dual plane, tunnel ram, individual runner, etc)
~ what kind of flow does the stock IM put down in CFMs? My guess is either 300 or 400 CFMs, but I dunno.
~ what kind of lifters do they use? hydro flat tappet, solid flat tappet or roller solid/hydro lifters?
~ what kind of lift and duration does the cam produce on the stock valves?
Tryin to calculate what kind of power I could be making with just an overbore and stroker kit on a 4.6
Any help is appreciated.
10-25-2004, 06:43 PM
#9
4th Gear Member
Join Date: Sep 2003
Location: United States
Posts: 1,404
RE: bore/stroke question.
I've heard that .020 is the highest a 4.6 block should be overbored reliably, but I guess .040 over is possible. Only time will tell how reliable it is. The GT blocks are all iron I believe, and the Cobra blocks, pre-'03, are aluminum.
Interesting about the intake, I always thought they were individual runners...
The largest displacement I've seen from a 4.6 is 302 cubes with a stroker crank and I believe a .020 overbore. If you wanted more cubes, you'd probably have to have a custom crank made which gets exremely expensive, or possibly have the crank throws offset-ground and get some custom rods and pistons for a longer stroke...if you want that many cubes, it would be a lot cheaper to use a stroked 302 or a 351, but everybody has their own reasons.
Interesting about the intake, I always thought they were individual runners...
The largest displacement I've seen from a 4.6 is 302 cubes with a stroker crank and I believe a .020 overbore. If you wanted more cubes, you'd probably have to have a custom crank made which gets exremely expensive, or possibly have the crank throws offset-ground and get some custom rods and pistons for a longer stroke...if you want that many cubes, it would be a lot cheaper to use a stroked 302 or a 351, but everybody has their own reasons.
10-25-2004, 06:45 PM
#10
I ♥ Acer
Join Date: Sep 2003
Location: United States
Posts: 8,826
RE: bore/stroke question.
ORIGINAL: USAMuscle
I've heard that .020 is the highest a 4.6 block should be overbored reliably, but I guess .040 over is possible. Only time will tell how reliable it is. The GT blocks are all iron I believe, and the Cobra blocks, pre-'03, are aluminum.
Interesting about the intake, I always thought they were individual runners...
The largest displacement I've seen from a 4.6 is 302 cubes with a stroker crank and I believe a .020 overbore. If you wanted more cubes, you'd probably have to have a custom crank made which gets exremely expensive, or possibly have the crank throws offset-ground and get some custom rods and pistons for a longer stroke...if you want that many cubes, it would be a lot cheaper to use a stroked 302 or a 351, but everybody has their own reasons.
I've heard that .020 is the highest a 4.6 block should be overbored reliably, but I guess .040 over is possible. Only time will tell how reliable it is. The GT blocks are all iron I believe, and the Cobra blocks, pre-'03, are aluminum.
Interesting about the intake, I always thought they were individual runners...
The largest displacement I've seen from a 4.6 is 302 cubes with a stroker crank and I believe a .020 overbore. If you wanted more cubes, you'd probably have to have a custom crank made which gets exremely expensive, or possibly have the crank throws offset-ground and get some custom rods and pistons for a longer stroke...if you want that many cubes, it would be a lot cheaper to use a stroked 302 or a 351, but everybody has their own reasons.
