Stock Crank Limitations
Staging Lane
Joined: Jan 2010
Posts: 89
Likes: 0
From: Woodlawn IL
Budget (inexpensive) High HP/Torque and Daily driven and reliable seldom go together. If they did I would have a Pro Stock engine in my shop truck to run road calls.
My old 355 was a budget build and I put down 422 RWHP with a 10 minute tune and I was running out of fuel....
When we put a race gas tune in it with more timing it made 437 RWHP.... stock crank, 6" eagle rod, SRP pistons... Stage II LT1 heads, ported intake, 58mm throttle body, long tubes,4" Mufflex..... this was an M6 before I went to a TH400....
500 RWHP from a 355 is going to take alot of compression, bigger heads (like 210's or 220's), solid roller cam with shaft rockers and a single plane manifold will certainly help. Not much of those things are stuff you would usually see on an only car Daily driver....
FWIW if i put a 6 speed in my car now my engine now would probably put down about 540 RWHP (I lost 50 RWHP from switching from T56 to TH400)... I put down 490 RWHP thru a TH400 and 4000 stall naturally aspirated... but it's no daily driver and not a 355 anymore....
just showing how it's not easy to make 500 RWHP NA with ANY LT1 much less a 355... 450 is doable...
When we put a race gas tune in it with more timing it made 437 RWHP.... stock crank, 6" eagle rod, SRP pistons... Stage II LT1 heads, ported intake, 58mm throttle body, long tubes,4" Mufflex..... this was an M6 before I went to a TH400....
500 RWHP from a 355 is going to take alot of compression, bigger heads (like 210's or 220's), solid roller cam with shaft rockers and a single plane manifold will certainly help. Not much of those things are stuff you would usually see on an only car Daily driver....
FWIW if i put a 6 speed in my car now my engine now would probably put down about 540 RWHP (I lost 50 RWHP from switching from T56 to TH400)... I put down 490 RWHP thru a TH400 and 4000 stall naturally aspirated... but it's no daily driver and not a 355 anymore....
just showing how it's not easy to make 500 RWHP NA with ANY LT1 much less a 355... 450 is doable...
I'll give you an example, SS Aleks on this site made 500 rwhp through a 12-bolt with his AI heads/intake (stock castings), and a moderate solid roller. Not just a dyno queen either, I believe he went high 10s @ 128mph...Surely you've seen his vids on here...
Once again, not saying these results are the norm, just saying 500rwhp is do-able with 355ci and M6 with a well thought out and well tuned combo without using high-dollar aftermarket heads/single plane intake
Last edited by Colin91Z; Jan 22, 2010 at 01:56 PM.
While I agree 500 rwhp from a 355 is not easy and certainly not the norm, I don't agree that you need 210 or 220cc heads combined a single plane to get there. However, I do agree that a SR cam will likely be required.
I'll give you an example, SS Aleks on this site made 500 rwhp through a 12-bolt with his AI heads/intake (stock castings), and a moderate solid roller. Not just a dyno queen either, I believe he went high 10s @ 128mph...Surely you've seen his vids on here...
Once again, not saying these results are the norm, just saying 500rwhp is do-able with 355ci and M6 with a well thought out and well tuned combo without using high-dollar aftermarket heads/single plane intake
I'll give you an example, SS Aleks on this site made 500 rwhp through a 12-bolt with his AI heads/intake (stock castings), and a moderate solid roller. Not just a dyno queen either, I believe he went high 10s @ 128mph...Surely you've seen his vids on here...
Once again, not saying these results are the norm, just saying 500rwhp is do-able with 355ci and M6 with a well thought out and well tuned combo without using high-dollar aftermarket heads/single plane intake
what i'm getting at is figure out what kinda power you wanna make. Then buy parts and establish a combo that is going to give you the best chance to achieve that goal while only sacrificing things that you can stand to live without..... Daily driven, 355 cubic inches and 500 RWHP is gonna be SUPER TOUGH to do cause they are polar opposite goals. Daily driven and 500 RWHP is as different as black is to white...
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Joined: Jan 2010
Posts: 89
Likes: 0
From: Woodlawn IL
Thats likely because very few have tried it as most would start with a crank that they know is up to the task.
If the crank does fail it is likely to destroy the whole engine in doing so. So why try and build something that if it does not work it will ruin all of your hard work and money you have in it. I say go for it if you want to, somebody has to be the first to find out what it will take. But please put a Ballistic diaper on it because if it makes these numbers and you have your suspension sorted out you will be running close to or over 130 mph at the finish line. If you dont have a diaper at those speeds when you drive through your own oil its not going to be a fun ride and I dont want to read about anybody getting hurt. Can it be done, maybe, is it going to be SAFE and RELIABLE who knows.
