RAMM
Well-Known Member
Since there are quite a few threads concerning the venerable 4" stroked SBM currently on FABO, I thought why not one more?
I'm actually getting pretty excited about this one as I haven't done one of these at a higher comp ratio / ported LA heads and a solid roller cam with an Eddy SV intake in....well I've never done one quite like this.
Quick run down on the back story goes like this:
Customer (referred to as TM from here on out)has another machine shop handle the block machining and cylinder head work and has his neighbour "port" the heads and assemble the engine in his home garage. Nothing wrong with that. TM installs the engine in his Duster and proceeds to enjoy his new found TQ/HP in his 340/416 for awhile a very short while.
I cant remember how much the mileage worked out to be but it was very very little --the engine "locked" up solid while driving at low speed and that was that. TM was referred to me and he brought his disassembled engine in the back of his truck and a plan was formed.
Basically the cast crank was multi piece, bent rods, and a cracked 340 block was the result of many things ending in catastrophe. The build featured some nice parts but with the .484" PS cam, stock rockers, "ported" '894 heads, Air-gap, 3/8" stem valves, low compression, and stock width rod bearings, I'm pretty confident this was a 400hp-425 hp deal. Funny thing is TM told me it was really strong while it lasted. TM also told me it cranked real hard and didn't change when race gas was tried. Ok so I check the 340 block and it can't be sleeved as it cracked from the beating right down to almost the pan rail. So I try to console TM by telling him to find a 360 block and we can get underway. TM says he knows of at least 3-4 360's for like $50.00 I say great. A week later TM is told by those in his circle that the 408's don't run nearly as well as those 416's so he is on the hunt for a 340 block. I tell him to bring all of those 360 blocks in and I will sonic check them and we will do one @ 4.07" bore if possible there by getting him his 416 cubes and a stronger crank with more journal overlap to boot. Another week goes by and TM shows up with a very nice and very expensive 340 block. Oh well , he wants what he wants and I get that.
Anyways the plan is a high compression 416 (TM says close to 12-1 comp), solid roller, heavily worked X heads, Eddy SV intake, as much HP (500+-?) possible with his LA heads, dyno tested and tuned. Now that we're getting close I thought I'd share. J.Rob
p.s. Here is some pics of the "before".
I'm actually getting pretty excited about this one as I haven't done one of these at a higher comp ratio / ported LA heads and a solid roller cam with an Eddy SV intake in....well I've never done one quite like this.
Quick run down on the back story goes like this:
Customer (referred to as TM from here on out)has another machine shop handle the block machining and cylinder head work and has his neighbour "port" the heads and assemble the engine in his home garage. Nothing wrong with that. TM installs the engine in his Duster and proceeds to enjoy his new found TQ/HP in his 340/416 for awhile a very short while.
I cant remember how much the mileage worked out to be but it was very very little --the engine "locked" up solid while driving at low speed and that was that. TM was referred to me and he brought his disassembled engine in the back of his truck and a plan was formed.
Basically the cast crank was multi piece, bent rods, and a cracked 340 block was the result of many things ending in catastrophe. The build featured some nice parts but with the .484" PS cam, stock rockers, "ported" '894 heads, Air-gap, 3/8" stem valves, low compression, and stock width rod bearings, I'm pretty confident this was a 400hp-425 hp deal. Funny thing is TM told me it was really strong while it lasted. TM also told me it cranked real hard and didn't change when race gas was tried. Ok so I check the 340 block and it can't be sleeved as it cracked from the beating right down to almost the pan rail. So I try to console TM by telling him to find a 360 block and we can get underway. TM says he knows of at least 3-4 360's for like $50.00 I say great. A week later TM is told by those in his circle that the 408's don't run nearly as well as those 416's so he is on the hunt for a 340 block. I tell him to bring all of those 360 blocks in and I will sonic check them and we will do one @ 4.07" bore if possible there by getting him his 416 cubes and a stronger crank with more journal overlap to boot. Another week goes by and TM shows up with a very nice and very expensive 340 block. Oh well , he wants what he wants and I get that.
Anyways the plan is a high compression 416 (TM says close to 12-1 comp), solid roller, heavily worked X heads, Eddy SV intake, as much HP (500+-?) possible with his LA heads, dyno tested and tuned. Now that we're getting close I thought I'd share. J.Rob
p.s. Here is some pics of the "before".
