How do you guys like the Scat 408 cast crank rotating assemblies? I'm thinking of throwing together a "semi-budget" 408 shortblock and have begun pricing out kits.
Are the Scat cast crank kits with Icon 745 pistons worth a crap? $1,500 for a balanced rotating assembly seems pretty inexpensive. Are there any corners cut with these?
How do you guys like the Scat 408 cast crank rotating assemblies? I'm thinking of throwing together a "semi-budget" 408 shortblock and have begun pricing out kits.
Are the Scat cast crank kits with Icon 745 pistons worth a crap? $1,500 for a balanced rotating assembly seems pretty inexpensive. Are there any corners cut with these?
I'm going with a stock stroke 3.580 for lower piston speed, and because I have 4.10 gearing. Otherwise, I'm pretty much doing the Scat cast crank thing.
Put a 4” stroker and 3.91 gears.
Your piston speed will lower because you make the same HP and TQ at lower RPM.
So what’s the percentage increase in piston speed from 3.58 to 4.00 stroke? How does that compare to a Chevy 350?
3.58 to 4.00 stroke difference is .42”; about 7/16”. But that is the total diameter is the circle the crank journal travels. The throw or radius of the rod journer only increases .21”; less than 1/4”.
Good balance job + quality casting with no porosity = many happy 1/4 mile trips. And Cars and Coffee shows provided you avoid the mayhem seeking Mustangs.I wouldn’t hesitate to run a 4” crank up to 6500 in a street car forever!!!!!!!
Is this referring to a cast crank as well as the forged? Wouldn't 6500 RPM with a 4 inch stroke be a pretty high piston speed for cast?I wouldn’t hesitate to run a 4” crank up to 6500 in a street car forever!!!!!!!
Q1; Crank material doesn’t matter at this 6500 rpm level.Is this referring to a cast crank as well as the forged? Wouldn't 6500 RPM with a 4 inch stroke be a pretty high piston speed for cast?
What would you say the redline is in a 4 inch stroke smallblock like this?Q1; Crank material doesn’t matter at this 6500 rpm level.
A; No, not really. 7500+, yea.
55,000 plus street miles 700 plus runs at 6400 rpm. Used to drive it to the track race it and drive it home. CT to Cecil county. Cast crank. Still running it, but with 12.2 to 1 compression now.Is this referring to a cast crank as well as the forged? Wouldn't 6500 RPM with a 4 inch stroke be a pretty high piston speed for cast?
No, I did not answer that question.What would you say the redline is in a 4 inch stroke smallblock like this?
edit: sorry, asked that before you edited your answer to include the 7500 part
Not to hijack, but this thread has pretty much changed my mind on using the forged crank. If the cast crank from scat is a little lighter and is close to $500 cheaper, and I don't plan on ever going over 6500 rpm or 500 HP, I guess I should go with the cast? I'm probably gonna be around 425-450 HP on a 408 from the components I'm looking at I think..Yeah, most of the guys I race with that have 4" crank small blocks are at max HP by 6200-6800. No reason to spin it higher...that is the main benefit to the 4" crank, big power at a lower RPM. My current motor pulls hard to my self imposed red line of 7000 (I have a rev limiter at 7), but there is probably no reason to go over 6500...my old 410 stroker ran the same ET shifting between 6000 and 6500.
Is this referring to a cast crank as well as the forged? Wouldn't 6500 RPM with a 4 inch stroke be a pretty high piston speed for cast?
Not to hijack, but this thread has pretty much changed my mind on using the forged crank. If the cast crank from scat is a little lighter and is close to $500 cheaper, and I don't plan on ever going over 6500 rpm or 500 HP, I guess I should go with the cast? I'm probably gonna be around 425-450 HP on a 408 from the components I'm looking at I think..
At that power level you would be fine with either crank (425-450). I went forged because I race a lot, and I'm close to 600hp, give or take. From what I have read, Scat cast cranks are pretty stout...unlike Eagle cast cranks.Not to hijack, but this thread has pretty much changed my mind on using the forged crank. If the cast crank from scat is a little lighter and is close to $500 cheaper, and I don't plan on ever going over 6500 rpm or 500 HP, I guess I should go with the cast? I'm probably gonna be around 425-450 HP on a 408 from the components I'm looking at I think..
That is the point I’m at, when I pursue more power I will just build another short block. Forged crank and bush the lifter bores for roller. I have to run the same top end.And to grow that combo significantly to need a forged crank (100-150 more HP), you’ll have new cam, new valve springs, new heads or lots of $$$ to race port what you have, possibly improved rockers, and most likely new pistons.
At that point do you just build another motor and save/sell/transfer the old stroker motor?
I would like to see somebody post a picture of a broken mopar cast scat crank? Even a broken stock mopar cast crank?
Could be just a broken flex plate!My 360 broke a crank just cruising at 45 mph!! Haven't pulled it apart yet but the starter spins the back of the engine and the front pulley don't move!?
Hey Flyfish curious of your set up as I’m heading in that direction as well with a build .At that power level you would be fine with either crank (425-450). I went forged because I race a lot, and I'm close to 600hp, give or take. From what I have read, Scat cast cranks are pretty stout...unlike Eagle cast cranks.
Post the picture...My 360 broke a crank just cruising at 45 mph!! Haven't pulled it apart yet but the starter spins the back of the engine and the front pulley don't move!?