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Old 12-26-2012, 01:02 PM
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correct engine

I was just wondering if this is a good setup or not...
Weiand 177 Supercharger 2.10:1 to a 2.33:1 pulley drive ratio Holley 750-850cfm DP carb (boost referenced power valve modification)
350+.040" Low 8:1 compression ratio (92 octane pump gas friendly w supercharger)
resized 5.7" GM rods reground cast GM cast 400 crank
low compression -22cc dished 350 pistons. (Speedpro-Probe Forged)
large chamber straight plug Profiler 195cc cylinder heads 70-72cc chamber. (K-2 spring package for mechanical flat tappet cams)
comp cam part number..12-611-5
the vehicle is a 1985 chevy pro street truck and some strip. now for the tranny should i use a 4 speed or a th350. Thanks!

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Old 12-26-2012, 01:16 PM
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motor/trans

i like the motor set up u have.. some nice power even with a small blower... the trans will be fine too.. buddy had 750hp on a th350 bucket no problems..
so if u get done the engine and u don't like it.. i'll send u my address and u can ship it to me.. sure i'll pay shipping...
a free running sbc with super charger???? Oh yaaaaaaaaaa...
do i start pulling my motor out today ?????
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Old 12-26-2012, 04:28 PM
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Depends on the type of driving but spending the bucks on a over drive trans may be worth every penny in gas. If you got to hit the highway i would go for the th700r4 built to handle your engine.

Engine sounds fine not sure what your goals are as far as hp. But seems like you have all the right stuff.

Th350 can be built to handle plenty of power. And probably cheaper than building the four speed to take that kind of abuse.
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Old 12-26-2012, 05:28 PM
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85chevy10,
I must have missed something. "350" pistons with 5.7" rods won't work with a "400" crank(3.75" stroke). The pistons will come out of the top of the block a bit too much if I'm not mistaken.
1/2 of the stroke(1.875) plus the rod length(5.7")=7.575" only leaves enough room for a piston with a Compression height of around(stock block deck=9.025") 9.025-7.575= 1.45" or less . If I'm not mistaken "350" pistons usually have a compression height around 1.540"-1.560"
You'll have to get some pistons for a stroker application unless you use shorter stock "400" rods(5.565"). I don't recomend the shorter rods.
Someone please double check my math.
FWIW
ssmonty
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Old 12-26-2012, 05:32 PM
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Quote:
Originally Posted by 85chevy10 View Post
I was just wondering if this is a good setup or not...
Weiand 177 Supercharger 2.10:1 to a 2.33:1 pulley drive ratio Holley 750-850cfm DP carb (boost referenced power valve modification)
350+.040" Low 8:1 compression ratio (92 octane pump gas friendly w supercharger)
resized 5.7" GM rods reground cast GM cast 400 crank
low compression -22cc dished 350 pistons. (Speedpro-Probe Forged)
large chamber straight plug Profiler 195cc cylinder heads 70-72cc chamber. (K-2 spring package for mechanical flat tappet cams)
comp cam part number..12-611-5
the vehicle is a 1985 chevy pro street truck and some strip. now for the tranny should i use a 4 speed or a th350. Thanks!
400 cast crank isn't the greatest idea, but 350 pistons (roughly 1.56 compression height) 5.7" rods will make the pistons come out of the hole about 1/8".
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Old 12-26-2012, 05:37 PM
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You can buy a 383 kit crank cheaper than having the 400 crank turned and matched up for your block. The 383 cranks have a little more clearence than the gm 400 crank. Best to get the correct kit that is balanced from the factory.
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Old 12-26-2012, 05:41 PM
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Quote:
Originally Posted by hcompton View Post
You can buy a 383 kit crank cheaper than having the 400 crank turned and matched up for your block. The 383 cranks have a little more clearence than the gm 400 crank. Best to get the correct kit that is balanced from the factory.
where do cheap aftermarket 383 cranks have more clearance?
stock cranks are clearanced around the throws for 5.565 rods,not 5.7 or 6" like aftermarket ones.
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Old 12-26-2012, 05:57 PM
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Quote:
Originally Posted by Plaintoast View Post
where do cheap aftermarket 383 cranks have more clearance?
stock cranks are clearanced around the throws for 5.565 rods,not 5.7 or 6" like aftermarket ones.
After market cranks usally have more of a knife edge on them than the stock 400 crank. Also dont forget the pistons are shorter and the pin higher in a 383. They certainly look different to me when they are setting next to each other.
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Old 12-26-2012, 06:02 PM
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Quote:
Originally Posted by hcompton View Post
After market cranks usally have more of a knife edge on them than the stock 400 crank. Also dont forget the pistons are shorter and the pin higher in a 383. They certainly look different to me when they are setting next to each other.
I've built many, using stock cranks turned down, cheaper aftermarket ones and high end callies cranks. yes the wrist pin sits higher in the piston, and if nothing else is changed that doesn't give you more clearance.
the knife edge does nothing for clearance.
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Old 12-27-2012, 09:41 PM
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Quote:
Originally Posted by ssmonty View Post
85chevy10,
I must have missed something. "350" pistons with 5.7" rods won't work with a "400" crank(3.75" stroke). The pistons will come out of the top of the block a bit too much if I'm not mistaken.
1/2 of the stroke(1.875) plus the rod length(5.7")=7.575" only leaves enough room for a piston with a Compression height of around(stock block deck=9.025") 9.025-7.575= 1.45" or less . If I'm not mistaken "350" pistons usually have a compression height around 1.540"-1.560"
You'll have to get some pistons for a stroker application unless you use shorter stock "400" rods(5.565"). I don't recomend the shorter rods.
Someone please double check my math.
FWIW
ssmonty
ok so i have to get a crank for a stroker application and i should be good? and thanks i just want it done right and not wrong...
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Old 12-27-2012, 09:42 PM
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Quote:
Originally Posted by hcompton View Post
Depends on the type of driving but spending the bucks on a over drive trans may be worth every penny in gas. If you got to hit the highway i would go for the th700r4 built to handle your engine.

Engine sounds fine not sure what your goals are as far as hp. But seems like you have all the right stuff.

Th350 can be built to handle plenty of power. And probably cheaper than building the four speed to take that kind of abuse.
i want more than 500 hp and it will be a strret rod some strip and sometimes a daily driver.
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Old 12-27-2012, 09:44 PM
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Quote:
Originally Posted by delawarebill View Post
i like the motor set up u have.. some nice power even with a small blower... the trans will be fine too.. buddy had 750hp on a th350 bucket no problems..
so if u get done the engine and u don't like it.. i'll send u my address and u can ship it to me.. sure i'll pay shipping...
a free running sbc with super charger???? Oh yaaaaaaaaaa...
do i start pulling my motor out today ?????
dont pull it just yet i might like it too lol but i might!!!
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Old 12-29-2012, 12:51 PM
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Quote:
Originally Posted by 85chevy10 View Post
ok so i have to get a crank for a stroker application and i should be good? and thanks i just want it done right and not wrong...
NO.(I hope I'm not being suckered by a troll)
A 400 crank is a stroker crank when its installed in a 350 block. 350 crank stroke is 3.48". 400 crank stroke is 3.75". "Stroker" cranks are typically any crank that has a different stroke length than stock.
As I stated previously, 350 pistons have the piston pin location too far from the top of the piston to use a 5.7" rod and a 3.75" stroke crank. It will push the piston out of the block too far to bolt the heads on.
If you want to use a "stroker" crank with 5.7" rods you'll have to get pistons that have the pin hole closer to the top of the piston(look up piston pin compression height). Your 350 pistons won't work with a stroker crank and 5.7" rods.
To get 8.0:1 CR with a stroker crank you would have to buy pistons with around a 30cc dish to work with 70cc chambers. $$$$
If your going to supercharge it, it would be cheaper and much easier to use a 350 crank, your 5.7" rods, and a 350 crank. You will still have traction problems.
It may not be cheaper, but if I would use both forged pistons and a forged crank for a supercharged engine JMHO.
My calculations for a 350 with 4.040" bore, and 22cc dish pistons with a 70cc head, "zeroed" deck block, and a 4.166 bore x 0.039" thick head gasket comes to 8.25:1.
FWIW
ssmonty
PS Is it just me, or does everyone want 500HP.
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Old 12-29-2012, 01:32 PM
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Quote:
Originally Posted by ssmonty View Post

PS Is it just me, or does everyone want 500HP.
Must be you. I want 570-600 HP. But I didn't post it yet so it must be everybody. I've read the same thing alot in the last couple of weeks.
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Old 12-29-2012, 02:51 PM
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Quote:
Originally Posted by ssmonty View Post
NO.(I hope I'm not being suckered by a troll)
PS Is it just me, or does everyone want 500HP.
500 is the new 400 hahahahahaha. Just like every Ricky Racer out there needs a lumpy cam. Monkey see, monkey do.
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