help with stroker combo
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12 Second Club
Joined: Jun 2005
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From: Warner Robins Ga
help with stroker combo Hey guys, I've been lurking on this site for over a year now without ever posting anything. I've been learning a lot about fbods you guys. Now here's the question I have, for my Hotcam, airfoil, le1 elbow, and edelbrock headers a guy I work with will trade me a 1-piece rear main short block with a Scat 3.75 crank, 5.5 rods(stock 400 rods he said) and KB hypercrapnetic pistons with rings that have already been file gapped for that block(non Lt1). My question is can I use those internals on my Lt1 block. I'm pretty sure I can use the crank but what about the rods and pistons? Are there any pros and cons using the shorter rods? What cubic inches would this combo make? He said it would make it a 383, but I'd rather have your guys opinions or reccommendations? Thanks in advance
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Thread Starter
12 Second Club
Joined: Jun 2005
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From: Warner Robins Ga
Well i spun a bearing in my LT1 and this guy has a regular shortblock with a new 1 piece rear main seal Scat 3.75 stroker crank and he's using stock 400 small block rods and KB pistons. What I want to know is can i use this setup in my lt1 block or should I just use a 6.0 rod with the stroker crank? I gotta rebuild it so I might as well stroke it. I can get all this by trading him my hotcam and headers, I plan on going with longtubes and either a Joe O. or Lloyd Elliot cam. Hope this helps, thanks
Thread Starter
12 Second Club
Joined: Jun 2005
Posts: 509
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From: Warner Robins Ga
Well i spun a bearing in my LT1 and this guy has a regular shortblock with a new 1 piece rear main seal Scat 3.75 stroker crank and he's using stock 400 small block rods and KB pistons. What I want to know is can i use this setup in my lt1 block or should I just use a 6.0 rod with the stroker crank? I gotta rebuild it so I might as well stroke it. I can get all this by trading him my hotcam and headers, I plan on going with longtubes and either a Joe O. or Lloyd Elliot cam. Hope this helps, thanks
TECH Fanatic
Joined: Sep 2002
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From: BLOOMFIELD, NY
ok i got you know,
I know that the shorter you keep the stroke. The more rpms you can turn.
So if you used the shorter rods, You would have less of a stroke, I dont know what your finaly combo would come out to being.
I know that the shorter you keep the stroke. The more rpms you can turn.
So if you used the shorter rods, You would have less of a stroke, I dont know what your finaly combo would come out to being.
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Ummm, I really think that information is incorrect. Rod length has no affect on the stroke of an engine. It affects dwell time, and the amount of pressure the piston puts on the sidewall of the bore. Yes, you could use those internals in your LT1 block as long as its a 1 piece rear seal.
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As far as rod length is concerned there are 2 you can choose, 6" or 5.7" and what compensates for the change in length is the size of the piston, the longer rod makes for a shorter, but lighter piston. The ring packs are right under the wrist pin. Also the piston will dwell at TDC longer (for a few more degrees on the crank). So your compression will peak higher. This is a great N/A or Mild n2o set up. But for any other sort of boost application, go with 5.7" because the piston will be larger, but the rings are spaced more evenly and the compression should be down to around stock ratings.
Also what CC piston you choose will effect that. I have 6" rods with -16cc dished srp pistons and lt1 casting heads that have been shaved before. my Compression ratio is 11.25 to 1.
here is a good link on rod ratio.
http://victorylibrary.com/mopar/rod-tech-c.htm
Also what CC piston you choose will effect that. I have 6" rods with -16cc dished srp pistons and lt1 casting heads that have been shaved before. my Compression ratio is 11.25 to 1.
here is a good link on rod ratio.
http://victorylibrary.com/mopar/rod-tech-c.htm
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Joined: Mar 2005
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Originally Posted by BigKap94z
Ummm, I really think that information is incorrect. Rod length has no affect on the stroke of an engine. It affects dwell time, and the amount of pressure the piston puts on the sidewall of the bore. Yes, you could use those internals in your LT1 block as long as its a 1 piece rear seal.
In order to make a 3.75" stroke work with a 5.5" rod the pistons would have to be very tall. Your rod to stroke ratio will be horrible and you will most likely have thrust side wear problems. I wouldn't go shorter than a 5.7" rod.
Thread Starter
12 Second Club
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From: Warner Robins Ga
N20DAVE, thanks for the input. I've always heard about 5.7 or 6.0 rods with a 3.75 crank, but never a 5.5 rod. I was wondering what the cons of running a shorter rod would be, I think I'm getting it now. I'm going to go with a 6.0 rod. And thanks to all who've put their 2 cents in.
