5.0 s/c vs. 427 stroker
03-24-2006, 05:02 PM
#1
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5.0 s/c vs. 427 stroker
Noticing for about the same money I can either
put in a rebuilt 302 with s/c or just go for a 427 with carb
and get about same horse power.
Wondering how hard it is install a 427?
Do you have to get a raised cowl hood to make the aircleaner fit?
Is a carbed stoked engine like that a decent dailey driver?
Dont really care about fuel economy, are there any other draw backs?
Thanks, looks like making 500hp is like skinning a cat. Kazillion ways to do it.
put in a rebuilt 302 with s/c or just go for a 427 with carb
and get about same horse power.
Wondering how hard it is install a 427?
Do you have to get a raised cowl hood to make the aircleaner fit?
Is a carbed stoked engine like that a decent dailey driver?
Dont really care about fuel economy, are there any other draw backs?
Thanks, looks like making 500hp is like skinning a cat. Kazillion ways to do it.
03-24-2006, 05:13 PM
#2
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Join Date: Sep 2005
Location: Hamilton, NJ
Posts: 15,042
RE: 5.0 s/c vs. 427 stroker
FACTS: What you need to know/consider when you swap a 351W into a Fox3 platform chassis:
The 351 block is very similar to the 302. That means that almost all parts swap between a 302 and a 351. This includes: Heads, cam, lifters, timing chain, timing chain cover, water pump, engine mounts, and all sorts of other stuff. The bellhousing bolt pattern is the same as a 302, so all trannies that bolt to a 302 will bolt to a 351. However, there are some differences in the 351 that necessitate new parts:
1) The oil pan is different. Motorsports carries one. You can also get an oil pan of of an early eighties LTD Crown Vic. If you go the junkyard route, remember you also need a oil pan pickup tube, and a special main bolt that the pickup attaches to. The FMS pan is a pretty good deal, and if you shop around, you can get one for under $100, which comes with the dipstick, bolt, and pickup tube.
2) The internal balance of a 351W is the same as pre-81 302's (28.2 oz). The 5.0 HO has a 50 oz. unbalance, which means you cannot use the flexplate/flywheel or the harmanic balancer off of an HO engine. You have to get the correct pieces from a dealer/junkyard.
3) The deck height is higher, which means you need a different intake, since the 351W intake is wider. A 5.0 Upper will bolt to a 351W lower.
4) Also, a higher deck height means that the accessory bracket will need to be replaced. FMS sells the new bracket for about $50.
5) The higher deck height means the headers sit up higher than in a 302 powered Mustang. A special set is required for a 351.
6) A 351W will in all likelyhood not clear the stock hood. You will need a cowl hood for your car.
7) The distributor has a fatter shaft. You can obtain one from a 351W powered FI truck (if you are using FI) or any late 70's/early 80's car using the 351W and a Duraspark system if you are going to build a non-efi car.
Those are the major differences. As you can see, for about $1000 you can put a 351W in your Mustang. This is cheaper than a stroker, plus you wind up with a more reliable engine.
Tips: There are several things to look out for to ensure that your swap to a 351W is easier and more successful. They are as follows:
1) A high volume oil pump WILL NOT clear the FMS pan. If you want to run an HV pump, you must either modify the pan, or buy a Canton or similar pan, for many dollars more. The modifications just include cutting down the front drain bolt, and welding on a corner to the pan to clear the pump housing.
2) Get new motor mounts. If your mounts are questionable already, the additional weight of the 351W will make them fail in a hurry. I recommend the 87-93 convertable mounts, which will work in any 79-93 Mustang.
http://www.fast351.com/tech/351w.htm
That is the basics to doing this. Thats also a very good thing that you are not worried about fuel economy becuase gas would be a biatch. Another thing, a 427W CAN be reliable but its all about how you build it (how extreme, etc.). 500hp out of a 427 should be no problem if you get a nice matching setup. But since you are going carb'd of coarse its not going to be as reliable as a EFI motor. In most cases, with a carb'd 427 the tuning will be extreme. And as it states above, you will need to run some type of cowl hood since nothing will fit under the stocker.
My opinion, I wouldnt have a car like this for a DD. If you want a nice weekend car than do it but if you are just looking for a DD with power than go with a 302/331 with a supercharger. Also, you will spend more money on a 427W than a 302... thats not even a question. Just my .02
The 351 block is very similar to the 302. That means that almost all parts swap between a 302 and a 351. This includes: Heads, cam, lifters, timing chain, timing chain cover, water pump, engine mounts, and all sorts of other stuff. The bellhousing bolt pattern is the same as a 302, so all trannies that bolt to a 302 will bolt to a 351. However, there are some differences in the 351 that necessitate new parts:
1) The oil pan is different. Motorsports carries one. You can also get an oil pan of of an early eighties LTD Crown Vic. If you go the junkyard route, remember you also need a oil pan pickup tube, and a special main bolt that the pickup attaches to. The FMS pan is a pretty good deal, and if you shop around, you can get one for under $100, which comes with the dipstick, bolt, and pickup tube.
2) The internal balance of a 351W is the same as pre-81 302's (28.2 oz). The 5.0 HO has a 50 oz. unbalance, which means you cannot use the flexplate/flywheel or the harmanic balancer off of an HO engine. You have to get the correct pieces from a dealer/junkyard.
3) The deck height is higher, which means you need a different intake, since the 351W intake is wider. A 5.0 Upper will bolt to a 351W lower.
4) Also, a higher deck height means that the accessory bracket will need to be replaced. FMS sells the new bracket for about $50.
5) The higher deck height means the headers sit up higher than in a 302 powered Mustang. A special set is required for a 351.
6) A 351W will in all likelyhood not clear the stock hood. You will need a cowl hood for your car.
7) The distributor has a fatter shaft. You can obtain one from a 351W powered FI truck (if you are using FI) or any late 70's/early 80's car using the 351W and a Duraspark system if you are going to build a non-efi car.
Those are the major differences. As you can see, for about $1000 you can put a 351W in your Mustang. This is cheaper than a stroker, plus you wind up with a more reliable engine.
Tips: There are several things to look out for to ensure that your swap to a 351W is easier and more successful. They are as follows:
1) A high volume oil pump WILL NOT clear the FMS pan. If you want to run an HV pump, you must either modify the pan, or buy a Canton or similar pan, for many dollars more. The modifications just include cutting down the front drain bolt, and welding on a corner to the pan to clear the pump housing.
2) Get new motor mounts. If your mounts are questionable already, the additional weight of the 351W will make them fail in a hurry. I recommend the 87-93 convertable mounts, which will work in any 79-93 Mustang.
http://www.fast351.com/tech/351w.htm
That is the basics to doing this. Thats also a very good thing that you are not worried about fuel economy becuase gas would be a biatch. Another thing, a 427W CAN be reliable but its all about how you build it (how extreme, etc.). 500hp out of a 427 should be no problem if you get a nice matching setup. But since you are going carb'd of coarse its not going to be as reliable as a EFI motor. In most cases, with a carb'd 427 the tuning will be extreme. And as it states above, you will need to run some type of cowl hood since nothing will fit under the stocker.
My opinion, I wouldnt have a car like this for a DD. If you want a nice weekend car than do it but if you are just looking for a DD with power than go with a 302/331 with a supercharger. Also, you will spend more money on a 427W than a 302... thats not even a question. Just my .02
03-24-2006, 05:24 PM
#3
6th Gear Member
Thread Starter
Join Date: Feb 2006
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Posts: 5,263
RE: 5.0 s/c vs. 427 stroker
Thanks, 88
Gave me alot to think about. Dont really want a raised cowl hood.
so might just go with the 302/331 with s/c
thanks for all the info. going to print it out and save it.
Gave me alot to think about. Dont really want a raised cowl hood.
so might just go with the 302/331 with s/c
thanks for all the info. going to print it out and save it.
03-24-2006, 05:53 PM
#9
6th Gear Member
Join Date: Jan 2006
Location: Laredo, TEXAS
Posts: 6,054
RE: 5.0 s/c vs. 427 stroker
ORIGINAL: 88BlueGT
LoL I got it off of fast351.com <--- GREAT site for tech articles.
LoL I got it off of fast351.com <--- GREAT site for tech articles.
