D_Smith87

I have a 70's high nickel 010 block bored .60 over but its a 2 bolt main im gonna drop in my 87 iroc, wondering if 380 horsepower @ 6200 rpm would be too much for the block, im getting a 500 horsepower rated rotating assymbly from eagle, just want other peoples perspectives on it, i know there is an aftermarket for main caps, but with the machine work involved is that even worth it and the cost of studs? cam specs are 1800-6200rpm, lift is .488/.504, duration is .227/.233 @ .050, heads are bowtie phase 2 2.02/1.50 184 cc with 64 cc combustion chambers running around 9.8 to 1 compression with the setup. from what ive read this is do-able, but ive also heard of setups like this blowing **** apart.

sofakingdom

iTrader: (1)

No it is not "too much" for the block. Should be fine.

No in this day and time it's not really "worth it" to spend money on those old crappy 70s blocks with their pathetic QC. As cheeeeeeeeeeep as block cores are, might as well start out with the BEST you can get. The price of a newer block, which HUGELY reduces the risk of coming across unrepairable (at least, economicallY) problems like The Starter Bolt Hole Problem, The Lifter Bore Problem, The BH Dowel Pin Problem, The Head Dowel Pin Problem, and so on, is SO GREAT in those old blocks with their inferior metallurgy (the "high nickel" thing being one of those myths that JUST WON'T DIE) and pitiful quality control, that it doesn't make sense to sink money into one only to find out after you've spent $500 or whatever on it, that one of the cyl walls is rotted through from the water jacket, or it EATS pump bushings, or EATS cams, or something ...enjoyable .... like that. It's that kind of stuff that makes em "blow apart", not the 2-bolt mains.

D_Smith87

what makes me comfortable with the engine is it was my buddies, his dad was running in a early 70s truck, had it rebuilt, ran it under 10 k miles with no issues after the rebuild and took the engine out. just the engine came with some "388" heads which i couldnt find any information on except for that they are 76cc "smog heads", i dissasembled the engine myself, and nothing was wrong with it, could have ran it as is with new gaskets, (was sitting for 6 years), i just didnt want to attempt to put high horsepower on a stock iron crank, stock rods, bearings, and low compression pistons.

Brando5641

iTrader: (-1)

why not go carbed 5.3 or 6.0? You can pickup a 100k 5.3 slap a cam an intake and a controller and have a high 12 or low 13 sec car.

TTOP350

iTrader: (8)

I'd look for a 96 ish vortech truck shortblock.
Stick with a roller cam block.
010 doesn't meanits high nickle anyway.

86LG4Bird

iTrader: (1)

It sounds like you're confident it's in good shape, so by all means go ahead and use it. 380 is not high horsepower for any of your stock bottom end components; it would only cause issues if it already has wear/bearing clearance problems.
6200 rpm, including ANY amount of horsepower you're going to make naturally aspirated at that rpm, isn't even close to taxing the ability of the 2-bolt mains.
I'm racing a stock bottom 350 with 2-bolt mains for over 2 years, shifting at 7100; no issues and don't expect any.
You WILL get cap walk if you try turning a stroker that high with 2-bolt caps.

And sofa's right about that "nickel content" lore. we don't worry about it all with modern GM factory blocks (Gen II LTx in this case), pushing them to 1000 hp (but those DO have splayed 4-bolt mains!)

D_Smith87

Finished building the motor this fall, took a while to have time to get it in my car and all setup, slapped on a 1407 edelbrock 750 that was tuned to the cam i baught for the car( my buddy ran it for a few thousand miles in his iroc, it was from a blueprint 383 "405hp, 440tq" motor, cam specs are .487/.508 lift, 234/244 duration with a 112 degree lsa, sounds great and runs nice 58 pounds of oil pressure at idle. for the heads i did up the 305 tuned port heads i had, were completely machined and milled down to 51ccs, competition valve job, and i did an extensive bowl blend, and opened up the intake runners and really worked the exhaust ports, real tiny of those heads. im thinking this motor will make a minumum 360 horse and upwards of 400 tq. the tolerances were real nice and tight especially on the rods, which is big for keeping the rods in one piece at any decent rpm.

D_Smith87

New motor build guys, running a comp xr288hr 236/242 .520/.540 2500-6000 rpm range, going to get a eagle 383 rotating assembly, but first off heads, bought a bare set of skip white nkb 200 heads, going to have them flowed soon, then bowl work done then flowed again, should be exciting to see what can be squeezed out of some budget heads. Advertised numbers are 250 intake 187 exhaust &.550 and seems on par with what ive researched