Jeb or others knowledgable about strokers
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 2,158
Likes: 9
From: N.E. WA
Jeb or others knowledgeable about strokers
How much clearance do I need between the crank and any other part? I will be using a scat 4340 3.75 crank. Does the block require clearancing at all? How about the rods? I will be using Scat H-beams with ARP 8740 bolts. I was thinking that a few needed clearanced. If you could give me some info on all the clearancing issues for a 383 it would be appreciated. TIA
[Modified by ANTI VENOM, 5:39 AM 10/18/2003]
[Modified by ANTI VENOM, 5:39 AM 10/18/2003]
Burning Brakes
Joined: Aug 2000
Posts: 1,146
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From: Albuquerque NM
Re: Jeb or others knowledgable about strokers (ANTI VENOM)
Actually. the block will need clearancing for the bolt head for the rods. Especially for the #7/8 cylinders. The crank itself will be fine. Another area of contention is the rod to cam clearance. As long as you are looking at after market rods will a cap screw rod bolt (ie no nut), you should be fine :rolleyes: in the cam to rod clearance area.
Melting Slicks
Joined: Sep 2000
Posts: 3,099
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From: PITTSBURGH PA
Cruise-In IV Veteran
Cruise-In V Veteran
Re: Jeb or others knowledgable about strokers (ANTI VENOM)
you will have to check every where rods to block usually around the skirts on the outside edges and around the cam try and get a minimum of .050 and you should be fine plus you want to do all your clearancs work first then if you had to take some of some rods that is when you will need to get ballenced anyways that is why i have my ballence job done last after mock up :cheers:
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 2,158
Likes: 9
From: N.E. WA
Re: Jeb or others knowledgable about strokers (CORKVETTE1)
I was curious about the rods, because my friends Oliver H-beams needed a little shaved off the cap and bolt head. I don't really remember much more about it than that.
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Re: Jeb or others knowledgeable about strokers (ANTI VENOM)
There are three places to check for clearence. Rod to pan rail, rod to the bottom of the cylinder bore, and rod to camshaft. Generally, "stroker" rods will clear, no problem. You didn't mention the rod length, if stroker rods or not, or if you have a bolt and nut type or a capscrew type. These three checks will suffice, regardless. CORKVETTE is right. Clearence, if necessary, for .050". Good luck, and...
RACE ON!!!
RACE ON!!!
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 2,158
Likes: 9
From: N.E. WA
Re: Jeb or others knowledgeable about strokers (CFI-EFI)
Well, the oil pan was made for a stroker, and the H-beams are 6.0" and are for strokers. The ARP 8740's are a bolt threaded into the cap. I am not running a small base circle cam. Is .050 pretty good for all RPM's? I doubt this engine will see over 7500, but sometimes stuff happens!
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Re: Jeb or others knowledgeable about strokers (ANTI VENOM)
Well, the oil pan was made for a stroker
The ARP 8740's are a bolt threaded into the cap.
Either way, stroker rods should have no problem clearing with only a 3.75" stroke. BUT! Don't take anyone else's word for it. Not even mine. CHECK IT FOR YOURSELF. It won't cost me a dime, if I'm wrong.
Fifty thousandths should be plenty. Besides, if I am right, you'll have plenty, already, especially at the cam. Good luck, and...
RACE ON!!!
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 2,158
Likes: 9
From: N.E. WA
Re: Jeb or others knowledgeable about strokers (CFI-EFI)
I should read through my answer before hitting the ol POST button. (boy is my face red) You are absolutely correct on the rod bolt threading into the rod itself. I actually know engines fairly well, but this is my first time around with a stroker, so please excuse the ignorance.. My block's pan rail is clearanced some already, but I will check it when I mock up the rotating assy. I also thought that the oil pan's rail must get pretty close as well since they build some of them with a little more clearance in the rail area. Maybe those are for longer strokes than 3.75. Thanks for your help...
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Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Re: Jeb or others knowledgeable about strokers (ANTI VENOM)
No prob. I suspected as much. You're doing just fine. I am in the process of screwing together a 4" stroker with/for a friend. Good luck, and...
RACE ON!!!
RACE ON!!!
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 2,158
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From: N.E. WA
Re: Jeb or others knowledgeable about strokers (CFI-EFI)
Hi, my name is ANTI and I am an addict. My addictions include NITROUS consumption and the Corvette Forum. Thanx for welcoming me!
Drifting
Joined: Feb 2002
Posts: 1,952
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From: Little Rock Arkansas
Re: Jeb or others knowledgeable about strokers (ZD1)
Well...Everyone seems to have filled you in as much as you need to be... Typically the bottoms of the cylinders will need to be clearanced for the rod bolt/nut on the rod as said. You need to pay close attention to rod/cam clearance as well; on a lot of strokers with big cams and narrow lobe seps you can get base circle contact with the rods... That's why they build "reduced base circle cams." It's usually not an issue with 383's unless a monster cam and big rods are used (like aluminum rods); but it is usually a factor on 396's and longer strokes. Really those are the only clearances that need to be paid close attention to that's different on strokers...
-Jeb
-Jeb