331 ot 347? which is better?
07-21-2006, 03:37 PM
#31
5th Gear Member
Join Date: Mar 2006
Location: Greenville SC
Posts: 2,317
RE: 331 ot 347? which is better?
You're gonna spend more money (or get damn close to) building a nice reliable 331/347 as you would starting with a better/stronger 351W based Stroker. For the money, you are going to get closer to higher HP, more reliability, and a stronger starting point.
The lower block area of the 302 based engines is where the weakness is, that is undisputed.
Once you start cutting into the block, which is what you will do when stroking a 302, you are going to compromise the structural integrity of the block and create a situation where you have to reinforce the block to support higher RPMs and/or Horsepower. Stud girdles won't be much help and what's the point of spending the extra $ to add 4 bolt mains to strengthen?
In my ever so humble opinion, most guys that build 331/347's wanted to do it to get more HP. There are those that like the bandwagon as well and did it becuase it sounded like a "cool" idea.
If you are looking at getting the most for your money, you cannot discount the 351W based Stroker. All of your accessories bolt right on, minor mods (enlarging the bolt holes on your heads and one accessory bracket has to be modified) are all that takes to make it happen.
Oh yeah, and then there's the HP. What's the most that a 331/347 is going to make NA? Maybe 375 is it is crankin' and running good.
An efficient 393Ci will produce close to 400HP without any major work or tricks.
To me, that's a better deal and you have a way better startnig point from which to build onto an already monster motor.
My opinion but take it from a guy who was dead sold on a DSS 347 until I started to read up on other websites and talking to actual people who have done (both 331/347 vs 393) and learned to teach what they found out the hard (read:expensive) way.
Great luck to you,
Ivan
The lower block area of the 302 based engines is where the weakness is, that is undisputed.
Once you start cutting into the block, which is what you will do when stroking a 302, you are going to compromise the structural integrity of the block and create a situation where you have to reinforce the block to support higher RPMs and/or Horsepower. Stud girdles won't be much help and what's the point of spending the extra $ to add 4 bolt mains to strengthen?
In my ever so humble opinion, most guys that build 331/347's wanted to do it to get more HP. There are those that like the bandwagon as well and did it becuase it sounded like a "cool" idea.
If you are looking at getting the most for your money, you cannot discount the 351W based Stroker. All of your accessories bolt right on, minor mods (enlarging the bolt holes on your heads and one accessory bracket has to be modified) are all that takes to make it happen.
Oh yeah, and then there's the HP. What's the most that a 331/347 is going to make NA? Maybe 375 is it is crankin' and running good.
An efficient 393Ci will produce close to 400HP without any major work or tricks.
To me, that's a better deal and you have a way better startnig point from which to build onto an already monster motor.
My opinion but take it from a guy who was dead sold on a DSS 347 until I started to read up on other websites and talking to actual people who have done (both 331/347 vs 393) and learned to teach what they found out the hard (read:expensive) way.
Great luck to you,
Ivan
A 351 based stroker, even a mild build will have the potential for 400+hp. I was reading some articles on the net where they were doing dyno tests on a n/a 347...even with 600+ lift cams, and these are radical cams, ported Vic jr heads, 3inch headers, etc. A very radical motor, it only put down around 470ish hp. Thats nothing for the money and effort they put in. Do the same to a similar 408W your going to have a very potent 500+hp motor on all motor, throw some nitrous or blower on it and bam...full out drag engine. Plus you have the increased strength of a 351 based engine, with thicker block webbing, thicker deck surface, etc.
And your still only going to spend marginally more on the 351 based stroker, you can get budget 408kits for around $1,300-$1,500...some 347 and 331 kits cost equally as much and for full race kits exspect to pay over $2,500...
P.S.....A bigger bore, shorter stroke engine is still the preferred way to reach higher rpms. The shorter stroke allows the engine to excellerate faster.
07-21-2006, 04:39 PM
#32
4th Gear Member
Join Date: Apr 2006
Location:
Posts: 1,306
RE: 331 ot 347? which is better?
Mods are 5 psi SC, TF Street Intake, BBK 1 5/8 " equal length, Bassani X-pipe, 30 lb. injectors, 73 MM MAf, 70 MM TB, pulleys, MSD blaster coil, 160 thermostat, split fire plugs.
07-21-2006, 04:52 PM
#33
4th Gear Member
Join Date: Jul 2006
Location: The Great State Of Texas
Posts: 1,062
RE: 331 ot 347? which is better?
Myself. I built a 408 back in '88, and have been with that ever since. The only difference has been top end components that I have experimented with. There are bigger, smaller and everywhere in between. Look at what you will want to do. Not just what you can do right now, and decide on that. I am running a 4 bolt main total forged rotating assembly and I can support a lot of power. I did not want to be limited by much, life has too many already.
I now have a frsh 408 in my Notty, and am building another for Mondo service.
Have fun.
That's my $5
I now have a frsh 408 in my Notty, and am building another for Mondo service.
Have fun.
That's my $5
07-22-2006, 03:17 PM
#35
5th Gear Member
Join Date: Mar 2006
Location: Greenville SC
Posts: 2,317
RE: 331 ot 347? which is better?
i have a 60 over running it 3 yrs now runs cool...347 is a 30 over bore//u can bore it 40 over and 60 over...but i wouldnt suggest it being over 40 onnna stroker....
07-22-2006, 03:40 PM
#37
5th Gear Member
Join Date: Mar 2006
Location: Greenville SC
Posts: 2,317
RE: 331 ot 347? which is better?
Personally i say just build a 306 with Eagle rods a TRW pistons, that way you have a strong bottom end, strong enough to handle just about anything you can throw at it within limits, a 306 with a blower is a very respectable motor and is gonna be able to run with the big dogs and still make it home at the end of the day. But for big hp and lots of power adder, the 302 block is weaker, so there is no point in throwing a 347 kit can that handle 650hp into a block that cant hold 650hp reliably. But a 351 block is much stronger and you can build a reliable 650hp motor with it. UNless your racing in some special class that has a cubic inch limit, i would go straight for the 351, but thats just me talking.
07-22-2006, 04:35 PM
#38
6th Gear Member
Join Date: Feb 2005
Location: KY
Posts: 13,396
RE: 331 ot 347? which is better?
the rpms comes from ur cam selection. but as far as a stroker i have a 349 and i take mine to 6 but when i get it tuned with my chip and fix the rev limited i should be taking it to around 6500. and yes the block has to be notched
ORIGINAL: TtopFoxRod50
Is there a difference in compression ratio?
Is there a range in getting more or less rpms?
Would the block need to be notched to make room for the movement of the connecting rods?
-Matty
Is there a difference in compression ratio?
Is there a range in getting more or less rpms?
Would the block need to be notched to make room for the movement of the connecting rods?
-Matty
07-22-2006, 04:38 PM
#39
6th Gear Member
Join Date: Feb 2005
Location: KY
Posts: 13,396
RE: 331 ot 347? which is better?
ORIGINAL: 88stangaruu
agree'd
A 351 based stroker, even a mild build will have the potential for 400+hp. I was reading some articles on the net where they were doing dyno tests on a n/a 347...even with 600+ lift cams, and these are radical cams, ported Vic jr heads, 3inch headers, etc. A very radical motor, it only put down around 470ish hp. Thats nothing for the money and effort they put in. Do the same to a similar 408W your going to have a very potent 500+hp motor on all motor, throw some nitrous or blower on it and bam...full out drag engine. Plus you have the increased strength of a 351 based engine, with thicker block webbing, thicker deck surface, etc.
And your still only going to spend marginally more on the 351 based stroker, you can get budget 408kits for around $1,300-$1,500...some 347 and 331 kits cost equally as much and for full race kits exspect to pay over $2,500...
P.S.....A bigger bore, shorter stroke engine is still the preferred way to reach higher rpms. The shorter stroke allows the engine to excellerate faster.
You're gonna spend more money (or get damn close to) building a nice reliable 331/347 as you would starting with a better/stronger 351W based Stroker. For the money, you are going to get closer to higher HP, more reliability, and a stronger starting point.
The lower block area of the 302 based engines is where the weakness is, that is undisputed.
Once you start cutting into the block, which is what you will do when stroking a 302, you are going to compromise the structural integrity of the block and create a situation where you have to reinforce the block to support higher RPMs and/or Horsepower. Stud girdles won't be much help and what's the point of spending the extra $ to add 4 bolt mains to strengthen?
In my ever so humble opinion, most guys that build 331/347's wanted to do it to get more HP. There are those that like the bandwagon as well and did it becuase it sounded like a "cool" idea.
If you are looking at getting the most for your money, you cannot discount the 351W based Stroker. All of your accessories bolt right on, minor mods (enlarging the bolt holes on your heads and one accessory bracket has to be modified) are all that takes to make it happen.
Oh yeah, and then there's the HP. What's the most that a 331/347 is going to make NA? Maybe 375 is it is crankin' and running good.
An efficient 393Ci will produce close to 400HP without any major work or tricks.
To me, that's a better deal and you have a way better startnig point from which to build onto an already monster motor.
My opinion but take it from a guy who was dead sold on a DSS 347 until I started to read up on other websites and talking to actual people who have done (both 331/347 vs 393) and learned to teach what they found out the hard (read:expensive) way.
Great luck to you,
Ivan
The lower block area of the 302 based engines is where the weakness is, that is undisputed.
Once you start cutting into the block, which is what you will do when stroking a 302, you are going to compromise the structural integrity of the block and create a situation where you have to reinforce the block to support higher RPMs and/or Horsepower. Stud girdles won't be much help and what's the point of spending the extra $ to add 4 bolt mains to strengthen?
In my ever so humble opinion, most guys that build 331/347's wanted to do it to get more HP. There are those that like the bandwagon as well and did it becuase it sounded like a "cool" idea.
If you are looking at getting the most for your money, you cannot discount the 351W based Stroker. All of your accessories bolt right on, minor mods (enlarging the bolt holes on your heads and one accessory bracket has to be modified) are all that takes to make it happen.
Oh yeah, and then there's the HP. What's the most that a 331/347 is going to make NA? Maybe 375 is it is crankin' and running good.
An efficient 393Ci will produce close to 400HP without any major work or tricks.
To me, that's a better deal and you have a way better startnig point from which to build onto an already monster motor.
My opinion but take it from a guy who was dead sold on a DSS 347 until I started to read up on other websites and talking to actual people who have done (both 331/347 vs 393) and learned to teach what they found out the hard (read:expensive) way.
Great luck to you,
Ivan
A 351 based stroker, even a mild build will have the potential for 400+hp. I was reading some articles on the net where they were doing dyno tests on a n/a 347...even with 600+ lift cams, and these are radical cams, ported Vic jr heads, 3inch headers, etc. A very radical motor, it only put down around 470ish hp. Thats nothing for the money and effort they put in. Do the same to a similar 408W your going to have a very potent 500+hp motor on all motor, throw some nitrous or blower on it and bam...full out drag engine. Plus you have the increased strength of a 351 based engine, with thicker block webbing, thicker deck surface, etc.
And your still only going to spend marginally more on the 351 based stroker, you can get budget 408kits for around $1,300-$1,500...some 347 and 331 kits cost equally as much and for full race kits exspect to pay over $2,500...
P.S.....A bigger bore, shorter stroke engine is still the preferred way to reach higher rpms. The shorter stroke allows the engine to excellerate faster.
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