Now that i managed to blow up the 351-357 i am thinking about doing a stroker 393-408 I'm looking at kits and different prices, i may sell the nitrous and Interceptor II engine management computer and focus on building an 11 second engine with no power adder....with forged internals. I'll decide after i get some prices....and tear my motor down to see what happened and the extent of the damage :( :'(
the nice thing about the 393 is all you need custom is the crank which can be easily attained. It uses stock size rods and 302 pistons. less expensive then the 408 and 393 sounds cooler. i plan on buildin one soon using a newer style roller block so i can have huge by massive lift and duration. But like they say there is no replacement for displacement so go with what you can afford. as far as the bottle goes i'd keep it and run a 100 shot just to give it that little xtra. with all forged goodies in the motor there is no way you'd ever hurt it wiht onlt a 100 shoto on it. just my opinion though. Hope there isn't too much carnage. I'm waitin to tear into mine until I get more time an $$ to fix it.
Brad #2
From 393 to 408 isn't really a huge difference in CID, so I'm thinking (I know working without proper tools, again) that the HP/Torque would be in the same realm for both setups. you may be able to wring (read rev) more HP out of the 393, where the 408 may make a few more ft/lbs at a slightly lower rpm. I know you as well as all the racers here know HP=speed & torque=acceleration. If I were doing a 1/4mi car I'd probably stick with the 393 for a few more revs out the back door. For an 1/8mi car I'd sacrifice revs for torque to get a KILLER 60' time
above all.....it will be a street car first. Its EFI and the rev limiter is at 6250rpm so i can't ring the snott out of it anyhow ;D The 408 requires more clearancing on the block for the rods than the 393 (the 393 does not require any....but at .80 i would do it anyhow) Price wise, they are the same with what i would need, cast steel crank, SIR I beam forged rods and a forged pistons. I can get the kit for $939 with bearings, ARP rod bolts and moly rings. For just pistons and rods its about $520 Don't forget......shiney=good ;) ;D
I'm a "Hollywood" shiney kinda guy. if it ain't gonna be seen I don't much care what it looks like LOL. When asked what engine I've got in my Pinto, I usually just say it's a 2.5 ranger. who, besides us knows the difference? ;D ;D ;D
Got the engined pulled out last night, but no time to tear it down. We will take a look at it tomorrow night. My buddy got his motor back from the dyno, 986hp 700fpt @9700rpm! :o  and its Naturally asperated to boot, no nitrous just ALL motor. Its for his 8 second Monza Spyder, 17.3:1 compression :o its a stroker small block, 430CI Everything in it is aluminum or titanium. Just unreal.... with the dry sump oiling system and vacume, it will be over 1000hp.
sounds baddass, but not real streetable. ohhh to have a 1000hp STREET motor :P pant pant!! :P drool drool!! :P
No, its not a street motor, runs on 116 race gas :o twin 1050 dominators ;D But.....its still just a Chevy ::)
LMAO
(only little boys wear bowties HEHEHE)
I just bought a set of forged H beam rods for a 408 stroker (killer deal too) so it looks like my mind is made up! Yes Brad, they are shiney! ;D
Took it apart last night, big chunk missing out of the piston including about half of the top ring....it broke giving its all! The block and heads are fine , no damage. Over the course of the winter i'll be building a NA 408. I took some pictures i'll post them when i have time.
carnage picture.....could have been alot worse
Chris's new 1000hp monster
That's an awful lot of motor for that lil ol bicycle, but I can't think of a better use for a Chevy LOL
Yeah Jeff when you do it, you do it right don'tcha. I can't say as I've seen that kind of chunk come out of a piston before. I'd definately say that 351 block is charmed if that much came out without damaging anything!
yea, very thick deck on the windsor Sr. heads, and i'm sure the Manley SS valves helped out also. Guess thats why they call them hyperexplosive pistons. No real indication why, was not lean, no detonation.... Just wimpy pistons i guess ??? Some of the ring is mushed right into the piston on the top, the rest....went out the exhaust. I'll pull the valves on that head to check for any seat damage.
Jeff, at least you have a shiney engine stand............... :o
yes it was brand new....it was assembled just for my motor! Looking into taking my engine a bit further into strokerville.....418 cubic inches. Requires a 4.100 stroke crank, 6.200 rod and a 30 over Probe forged piston for this specific package. I allready have the rods, and the crank and pistons are the same price for 408 or 418 soooo.....blowing up motors is not fun.... ;)
No its not. I know how you feel. As soon as I can get the piston I melted back I will take a pic and show you how bad a custom forged JE piston can melt.... >:($$
when did you melt a piston?
I melted it last year at the track. Drove the thing back on 3 cyl.............. :P
oh in the green one?
Yeah, Ive got that car apart and im re-doing allot of it. I should have a few pic's soon.
I got a good one for you. Today I pre oiled my engine with a drill and the dristributer driveshaft. Good thing I did. About 30 sec into it I hear something leaking from under the engine. I stop and look and there is oil pumping out between the belhousing and bell dust shield. After scratching my head and talking to a few guru's I figure I must have missed the oil gally plugs in the rear of the block... >:( >:( >:( >:( >:( >:( >:( >:( >:(. Needless to say, Im going to be removing the tranny, and flywheel in the near future.. >:( >:( >:( >:( >:( ( bad day)
that s u c k s! I forgot a set of rings on a piston in my 340....(we were drinking while assembling) seen i had a set left, and thought cool, they sent me an extra set! Didn't relize i forgot them untill i started it up.....not good, lesson learned ;D My buddy forgot his rear main seal.....when he assembled his 302....