nightmare90gt

which would you choose and why
my plan is buy a big bore boss block just need to figure out which cubic inch to go with.

Mark O'Neal

I'd use the 4.125 bore..because it further unshouds the intake valve.

I would NOT use the Boss block in a stroker, because the cylinder skirt length has been shortened for stroker clearance...but the piston comes too far out at the bottom.

The Dart Sportsman is a better option.

nightmare90gt

the dart block is expensive then it has more machining to be done then the boss block ford recommends a max of a 3.4 stroke on the block so there should idealy be enuff clearance but will take it into consideration

tinman

Ford shortened the cylinders instead of notching the very bottom of the bore like we've been doing forever, guess they thougt it was cheaper to shorten it.
What I'd be concerned about is what sort of ring seal you'll have (and keep).
Alternative is the Dart block.
I really think that they (Dart) would have a higher quality standard than Ford so it may save you some $$ in the long term.
I'd do the big bore with a 3.400 crank, 5.400 rods......
There is no replacement for displacement

nightmare90gt

yeah i new some was going to say that i have been leaning towards the 363 i have found the dart block for 2150 which isnt to bad but it still has to be machined there are somethings i like about both blocks

boss has screw in freeze plugs and oil plugs, of coarse cheaper
the bad need special bearings for ots cams, the shorter skirts.

dart steel four bolt mains, can use standard cam bearings, has longer skirts for the stroke
bad cost, and freeze plugs those are just like stock so to big of a deal

also i believe i read somewhere you have to use a custom crank with the dart block is there any truth to that.

Mark O'Neal

The quality on the Boss block is quite good....just don't run it with a stroker.You didn't give us a horsepower level...but you could consider the Dart SHP.


No.

5.0kid

I would go with a 4.170 or 4.180 bore with a 3.3 stroke in a dart block that motor will love to be run hard.

nightmare90gt

i have decided on the dart block as my power goal n/a is about 400-500 with 9.5:1 compression ratio i have to get custom pistons made and i am sticking with the 4.125 bore with 3.4 stroker crank and 5.4 length rods

going to my twisted wedge heads ported to 195cc or 205cc havent decided yet
trickflow stage 2 cam( already have it brand new)
trickflow track heat intake ported
injectors not sure what size yet
later plans for a turbo kit thats why the compression ratio and thats what the cam calls for

just let me know if i selected the right intake, and the cam stays so please dont tell me i should do a custom cam, the cam should do good enuff for the power i am after

Mark O'Neal

I was messing with an imported version of our old EFI Spyder on my son's car. (Don't run one of those things.) The Track Heat is going on it now...I'll have some numbers after the mass air meter shows up.

I expect it will do quite well.

nightmare90gt

whats your engine specs