350hp!!

Topic: 350hp!! (Read 11262 times) previous topic - next topic

Reply #60 – November 06, 2007, 11:01:56 AM

Don't know, if you hold two in your hand the difference is obvious. The skirt is only a little shorter, but overall you can't compare to an OEM engine with a similarly low RR. I'm not sure how far they are offset, though I'm sure every trick available is used. Do some research, 331 vs 347 vs 347 with 5.315 rod is one of the most heated debates on the Ford engine building sites. It all boils down to good engine building. period.

350hp!!

Reply #61 – November 06, 2007, 11:05:22 AM

Quote from: Cougar5.0;186409

Do some research

I have, extensively, and haven't found a definitive answer. Although I suspect there isn't one. One thing to note is that the stock 302
pistons have a ~1.6 CH. Modern CHs are much lower, down around 1.2"/1.3". So, comparing a stock piston with a 347 piston isn't apples-to-apples.

350hp!!

Reply #62 – November 06, 2007, 11:16:29 AM

...except that the engine wasn't originally designed for such a short compression height and you are relying on the expertise of the aftermarket piston vendors to compensate - some are good, some are bad.

And if the design wasn't a compromise, you wouldn't have all the discussion about rod ratio, compression height, skirt rigidity, pin offset, oil ring in the pin hole etc. Why do all the vendors make claims about how their design is better? Why did Probe make a short rod version where the pin is below the oil ring and the CH is higher? Why do even the piston manufacuters argue to no end on places like HC50 if there is nothing to argue about? Trying to "simplify" this for the novice is a fools errand - it's not simple.

Sorry, I know you said you didn't have a definitive answer, just wanted to throw out some more arguments...

350hp!!

Reply #63 – November 06, 2007, 11:43:33 AM

The "engine" wasn't designed for it because piston technology hadn't progressed far enough to make shorter CHs reliable. A quality piston with a shorter CH would work fine.

It certainly isn't simple, but when you get down to brass tacks, 347s will work just fine if you use quality parts and quality machining. I think we agree on this point (and on the others too). Those two items are the most important parts of the puzzle.

350hp!!

Reply #64 – November 06, 2007, 11:52:50 AM

A 5.315 rod 347 uses the same piston as a 331 with a 1.175" compression height with a 1.59 rod ratio as opposed to the 1.09" compression height used in 5.4" rod equipped 347's with a 1.56 rod ratio. The larger piston is of course going to be heavier, but the wrist pin is moved down and does not intersect the oil ring land which is a bonus as well (although the newer 5.4 kits do not have the oil consumption issues the old ones did). Like everything else it's a trade off. Read a rather lengthy debate on it here: http://sbftech.com/index.php/topic,7010.0.html

350hp!!

Reply #65 – November 08, 2007, 09:26:51 PM

ok, my father and i are going to the place where im getting my engine rebuilt next week! so what crankshaft, rods and pistons should a get? and what cam? im probably going to have to stay with stock heads and intake for right now.
how much does the KB cost?

350hp!!

Reply #66 – November 08, 2007, 10:21:07 PM

Not to be nasty or anything else,BUILD IT.Talk later!

350hp!!

Reply #67 – November 09, 2007, 12:15:12 AM

That was a bit nasty.

I'm like forged pistons over hypers. You cannot use nitrous or boost with hypers. I would keep your compression under 10 to one so you can still use pump gas.

I think I would start with a kit like this one. I know nothing about this company and it is only an example. This kit does not tell me what the compression is so I would want to find out this first. And also since I'm into Cadillac engines and not Fords I'm of little use.

http://cgi.ebay.com/ebaymotors/5-0-302-SMALL-BLOCK-FORD-STROKER-331-347-KIT-NEW_W0QQcmdZViewItemQQcategoryZ33620QQihZ020QQitemZ300167980355QQrdZ1QQsspagenameZWDVW

Something like this is also temping since it's all ready to go and has lots of quality parts, but no cam for this price.

http://cgi.ebay.com/ebaymotors/D-D-331-347-STROKER-ENGINE-SBF-FORD-SHORT-BLOCK_W0QQcmdZViewItemQQcategoryZ33627QQihZ005QQitemZ150178434600QQrdZ1QQsspagenameZWDVW

I think if I was you I would try to find a good rebuildable core and rebuild this so that your car is not down. Also the more you do yourself, the more you save, and the more you learn.

TED

350hp!!

Reply #68 – November 09, 2007, 01:40:15 AM

Here's a question for everyone;

Would a 1990 Lincoln Towncar be a good engine and transmission for a core to rebuild for a project like this? I know a guy that has one for sale pretty cheap because the overdrive no longer works and it has a bad freeze plug so it will not hold water. Still a very nice car and runs good. He lives in Fife so he would be close to Quicksilver. If he was energetic he could maybe sell some of the towncar parts on eBay and get some money back.

TED

350hp!!

Reply #69 – November 09, 2007, 11:57:59 AM

For the most part, it's standard SO parts. Same block as the rest of the 5.0 rollers.

350hp!!

Reply #70 – November 09, 2007, 04:07:18 PM

Okay so I'm confused. How does the 1990 Towncar engine compare to his 1988? Is it worth picking up or should you try to find one from a Mustang to rebuild.

TED

350hp!!

Reply #71 – November 09, 2007, 06:42:57 PM

Quote from: Cad-T-Bird 500;186840

Okay so I'm confused. How does the 1990 Towncar engine compare to his 1988? Is it worth picking up or should you try to find one from a Mustang to rebuild.

TED

The engine long block is the same. If he's going to replace the pistons anyway it doesn't matter if he starts with a forged piston Mustang/Mark VII HO block or the SO 5.0 block.

350hp!!

Reply #72 – November 11, 2007, 09:09:45 PM

haha i would do it my self but my father doesnt trust me.
i have a question for you guys. if you had 4grand to spend on the motor, what would you do with it. i have one week to make my mind up about if i want a stock HO with a supercharger, with a holley intake manifold or get my motor rebuild with a 331 stroker kit, but keep stock heads and intake?

350hp!!

Reply #73 – November 11, 2007, 09:11:24 PM

oo and you had to have a shop do ALL the work( because your father doesnt trust you and your father knows nothing about engines, so he would be of no help)

350hp!!

Reply #74 – November 11, 2007, 09:13:01 PM

oo and thank you for all your insight and help! i would still be really confused and lost with my car without your guys help, so it is greatly appreciated that you guys take your time and help out a youngster like myself.