Posted By: jhkintx
SB build ideas!! - 09/04/09 01:10 AM
Its time to begin gathering parts for a new small block; please help me get the most for my money.
Goal - Streetable pump gas motor with 425 plus HP
Going into - 70 Dart with mild 904, 2400 stall converter, and 3.91 suregrip
I'm currently thinking about a MP 408 stroker short block with Edelbrock Heads. If I go this route what cam, intake, and carb would you recommend?
Or, do I build a 390 stroker with my current 318 that currently has the magnum head setup.
Im also open to other alternatives based on your responses.
Posted By: solidcam
Re: SB build ideas!! - 09/04/09 02:06 AM
The cheapest way to get there is probably with the 390 option and keep the magnum heads,... you didn't mention if the 318 was a roller block or not as that may open some cam options.The 408 edelbrock combo would meet your goals and allow for future growth should you go there.I would go the 390 route,upgrade your rods,clean up the magnums,air gap and 750 demon carb.You want some compression 10:1 and with the magnums you may get quench and pump-gas driveability.I am biased towards solid cams(maybe not for you)look at 560 lift and
250-255@50.With 390 cubes,some head work and a good cam 425hp should be easy.Hopefully others will contribute some more informed options.
Posted By: DaytonaTurbo
Re: SB build ideas!! - 09/04/09 02:30 AM
If you want to do a backyard rering type build, a junkyard 440 with bolt-ons and a stock bottom end will get you to your 425hp pretty easily. Also a 5.7 Hemi with an aftermarket cam and valve springs will get you there as well. And there used to be some good deals out there on crate small blocks, not sure about these days though...
Posted By: goldmember
Re: SB build ideas!! - 09/04/09 03:40 AM
The problem with a 425hp big block is a 350hp smallblock will kill it. 425hp isn't a challenge(unless you want lots of idle vaccum). The factory MP 435 hp crate motor is a simple template for you to follow. I'm not crazy about the 318 block builds,just find a decent 360 block and be done with it. You don't need the 4" crank but if you insist on a street converter it would make for a quicker ride. If I was starting from scratch, a 360 magnum or pre mag hyd roller block,hyd roller cam
240ish@.050 on both sides 108lsa,.530-.560 lift,10 to 1 compression,edelbrock magnum heads,rpm airgap 750dp 1 3/4" headers. Very easy to make a fun but mild street car.
Posted By: patrick
Re: SB build ideas!! - 09/04/09 12:56 PM
I'd start with a roller block and run a hydraulic roller cam with OEM lifters.
streetable, displacement is always your friend. if your mag heads are untouched, opening up the pushrod pinch, doing some bowl blending after taking the valve job out to actually fit the 1.92/1.625 valves (the OEM VJ is typically about .030" undersized for those valves), and do a little valve guide boss profiling, and your current heads will support 425-450 HP.
if this is a budget build, I'd pick up a mag 360, keep the stock crank and rods, use KB107 pistons, do the aforementioned port work, use hughes 1110 springs, and get the roller cam reground by bullet cams, and see if they can fit the HR272/340 lobe on the core, using the same lobe for intake and exhaust. you may need to cut the valve guides down some for seal/retainer clearance with this much cam.
I'd be tempted to try the Scorpion Performance AMC pedestal mount rocker kit on the mag heads, too.
Posted By: jhkintx
Re: SB build ideas!! - 09/05/09 11:19 PM
I"ve also given thought to a cetrifical type supercharger; if I choose this path do I go with forged internals and lower compression (8 or 8.5 to 1). What hp could I expect with 8 to 10 lbs of boost? Would this be streetable?
Posted By: jhkintx
Re: SB build ideas!! - 09/08/09 05:38 PM
I WANT one...
I assume that is a 392 crate?