12.5:1 355 on pump gas, with a little bit of juice safe?

[Chrizar]

So I've been wanting to build a 383 for a while, and decided a 355 is more cost effective and will meet the HP goals I have for now. I spun bearings in my 4 bolt motor and killed the stock crank, my main concern is will a stock crank be up to the job is spinning near 7k on the reg, since I know these motors can handle a 150 shot on a perfect tune stock. I'm not looking to run a big shot, 100 at the most and it's not a track car, just a fun street car that see's a tiny bit of track time and lots of goofing off on the street. I have 93 at the pump, and plan on running that or E85 if I have to.

My current thoughts on the parts combo for my 355 would be:

Compstar comet lightweight crank, stock stroke (or stock crank if I can find a good used one)
Eagle forged I beams with ARP fasteners
Some sort of a forged piston, Mahle, JE, etc -5cc relief
AI 200CC stock castings 52cc chamber
port matched intake
58mm tb
AI matched cam, will probably end up being a custom grind but for the time being I'm looking at a 234 242 .576 .580 with a 110 lsa.
of course proper springs etc etc
ls7 lifters
comp pro mags 1.6's NSA guides, hardened pushrods 7/16th studs etc
not sure on HG yet, I have to figure out what my deck height will be after the block is machined but most likely an .026 or .029 MLS one.


I'm mainly looking for about 430whp through an a4 on motor hoping for 520 give or take on spray, mainly looking for opinions of if this will work for what I want or if i'm way off on my parts list here.

[zooguy]

7K+ on hydro lifters ... you may want to go solid lifters

[Chrizar]

7k max, as I wont have the money for a 24x swap for a while after all this. I'll be picking a cam to stay under 7k hopefully, but the bottom end should be able to spin 8500.

[dawdaw]

like i said man, static compression isn't where you should be looking, dynamics where it's at.... the bigger the cam you run, the lobe seperation, and where you put it in at is gonna have a big determination on how much cylinder pressure you make... Along with having your cooling system up to par and having the tuning spot on will determine whether you can run safely on 93 and run spray... on motor i don't see it an issue, but if you want to spray it would be in your interest to throw some 110 in the tank just for the safety factor... I'm sure with a small shot you could get away with it but a big shot i wouldn't try it... over fueling can bust a ring land and that's never pretty lol

[Chrizar]

This is all in the works still, just mainly getting the ideas down that my parts list is not shit or my goals are not realistic type thing. I'd rather only build this once and have it run great than have to swap stuff around. The cam is by no means set and I know dynamic will play the ultimate role as what cam goes in etc. I have to talk with AI for that when the short block is setup. Spray wise again is only going to be a 100 shot so I'm not overly worried it would hurt anything on 93 pump gas. If all else fails I'll run E85.

[1sickta]

I run 12.2:1 and a 200 shot on 93. It's all in the cam & tune.

[Jayz28]

I run 12.2:1 and a 200 shot on 93. It's all in the cam & tune.

Ah your secret is the wizard tuning your car lol.

What kinda cam are you running? I can't remember.

[OVA1]

Well I'm stroked to a 396, 12.5:1 on 93… I have a nano-nitrous setup, but haven't sprayed this build yet. Tune's a bloody mess… but even with this mail-tune, the engine runs like a raped ape on 93.

Getting a dyno tune in a couple of weeks, so we'll see what they say about the juice.

[96lt1m6]

Anxious to see the numbers

Sent from my LG-P999 using Tapatalk 2

[popo8]

Anxious to see the numbers

Sent from my LG-P999 using Tapatalk 2

+1

Co-Owner/Admin @ LTXtech.com