4.460 bore center minus 4.250 bore leaves .210 between bores. Not good unless its already a siamese bore block. Even then its pushing it. Darton offered sleeves for a 6.1 for a while but I know it wasn't 4.250 bore.
Ric3xrt has been doing LS and R5 sleeves in to the BGE and 6.1 blocks since 2016....finally some one else caught on
Dartons 6.1 M.I.D sleeves were designed to go 4.155, which leaves .192 of wall left.
A few years back Ric had one with the Darton mid system, bored to 4.25 , leaves .145 of cylinder wall left , the test mule ran a real short stroke, was between 389-392CI. ran 6.5XX length rods , Idea was to keep the side load down , block had a little bit of hard block to help keep it stiff. I know he's done 2 or 3 with a 4.20 bore and 4.25 stroke, once with a 4.30. and one with a 4.40 winberg crank , the 516ci mule is a billet block with a 4.40 winberg
The Darton LS2/3/7 will work, need to trim the bottom , with the LS sleeve you have more side wall left, .220 if I remember @4.20 bore , I know at his old job they did a few 4.32 bore LS7s with the Darton sleeve and 1 G3 BGE 4.32 bore , paper thin wall , jacket was full of hard block.
Were they Darton MID sleeves for LS2/3/7??
If so what did they do to accommodate the difference in bore spacing?
LS has 4.400 bore spacing, so at 4.32 bore that leaves .08 between bores, .040 wall thickness per sleeve, what did they do for head gaskets in this type of build?
Yes Darton LS2/3/7 sleeves, I asked once about bore spacing , his reply is ," you just move it to what you need silly" , with the M.I.D system your basically cutting the deck out of the block, the end result is a piston guided thrust set up, 4.5 bore spacing Billet Canted valve head
There were doing it for years with SBC's before the 4.5BS and 4.6BS blocks came out, When I picked up my 488 he had a 4.5 space SB2 headed 454 there
Head gasket, I keep getting this cheep Chinese accent and the quote" Ancient top fuel secret" , so I'm thinking copper gasket and "O" ring deal.
Asked him why can't we do it to a G3 and he said , "You cut the check and I'll get it done".....hence my 488 I just picked up. 4.25X4.30 , Crank is a Winberg, Thitek heads BAM 3.5inch long lifters and Jesel Rocker system. cam is in the low .800s lift want to do a Holly hi Ram but the 2x4 top doesn't fit under the cowl of the truck, so drag pak it is.
I know what the dyno says, but I'm keeping that to myself till I get some runs on the truck, will see if the track times get close to the dyno #s right now my best was a 9.59 with the 463 , that was the run that the camshaft snapped on ,right behind the 1st journal. hopping for low 9s maybe crack an 8.99. with the 488.
