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Author
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Topic: Confused about strokers
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Kyle
Gearhead Posts: 421
From: Sumner, WA
Registered: Dec 2001
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posted 09-04-2003 05:27 PM
   
I have been doing a lot of reading about 331 and 347 stroker engines and am getting more and more confused about which one I want to build for my Fairlane. It seems that a 331 will rev higher, has a better rod ratio, the piston can have a longer skirt so it won't rock in the bore and the pin isn't in the oil ring. A 347 has 16 extra cubes, which can mean more HP at a lower RPM, and lower RPMs is easier on an engine's parts as far as longevity is concerned.I have a prepped 302 block, Victor Jr. heads, and Victor Jr. intake that I am going to build this engine for, and I want to shoot for 500hp NA. It will be strictly for strip use. So the question I guess is; is higher RPM or more displacement better?
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Dubz
Gearhead Posts: 1781
From: Manitoba Canada
Registered: Oct 2002
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posted 09-04-2003 05:33 PM
why higher rpms are hard on an engine is piston speed, which also increases with a stroker, so the 347 will be as hard or harder on the engine because of the increased piston speed due to the longer stroke (in the same amount of time for a rotation)[This message has been edited by Dubz (edited 09-04-2003).]
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Rustang
Gearhead Posts: 775
From: Clarion PA
Registered: Nov 2000
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posted 09-04-2003 06:03 PM
From what I've heard, oil control can be a problem with the 347.
IMO if you're building a 500hp 347, make sure you go top shelf with a good steel crank and at a minumum go with the sportsman block. Guys'll tell you the stock block will be fine, and you might get lucky with one and never break it, but there's not alot of meat around those mains and it could catch up to you! 
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Dave Gibson
Moderator Posts: 9146
From: Norfolk, Virginia, USA M&M#166 MCA#47921
Registered: Aug 99
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posted 09-04-2003 06:09 PM
Get a Mexican 302 block to build into a stroker. Dave & Terri ------------------
'65 Mustang Fastback
'02 Explorer XLT
I don't suffer from insanity. I enjoy every minute of it!
We have enough youth, how about a fountain of smart?
Common sense is not so common anymore.
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Kyle
Gearhead Posts: 421
From: Sumner, WA
Registered: Dec 2001
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posted 09-05-2003 10:04 PM
Is there a performance difference between a 347 with a 5.315" rod vs. a 5.4" rod? The 5.315 makes it so the pin isn't in the bottom oil ring.
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67357C
Gearhead Posts: 475
From: Newcastle, WA.
Registered: Aug 2003
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posted 09-06-2003 11:48 AM
Proper terminology>>>Tensile loads v. Cyclical loads
I'm in agreement, Cyclical loads are much more damaging. quote:
Originally posted by Kyle:
I have been doing a lot of reading about 331 and 347 stroker engines and am getting more and more confused about which one I want to build for my Fairlane. It seems that a 331 will rev higher, has a better rod ratio, the piston can have a longer skirt so it won't rock in the bore and the pin isn't in the oil ring. A 347 has 16 extra cubes, which can mean more HP at a lower RPM, and lower RPMs is easier on an engine's parts as far as longevity is concerned.I have a prepped 302 block, Victor Jr. heads, and Victor Jr. intake that I am going to build this engine for, and I want to shoot for 500hp NA. It will be strictly for strip use. So the question I guess is; is higher RPM or more displacement better?
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jkilroy
Gearhead Posts: 1808
From: Vicksburg, MS
Registered: Dec 99
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posted 09-08-2003 08:23 AM
This question is ALWAYS easy to answer. When choosing between two builds, you ALWAYS pick the BIGGER one.SIZE DOES MATTER! Anyone that tells you otherwise either has a small motor or dates someone that does!  ------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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CometGT1974
Gearhead Posts: 393
From: Asheville, NC USA
Registered: Jan 2002
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posted 09-08-2003 11:21 AM
I've been running a 347 for the past couple of years....it was a street motor w/ a hydraulic roller and I have now switched to a solid roller and a BIG shot of nitrous. The motor has never smoked or used oil, even running synthetic!!
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