local shop quoted me $3200 for building a 347 stroker with aluminum heads roller cam. it does not include alternator, powersteering, ac compressor, distributor intake or carb. but i have all those things now on my 302. i am not sure how much horsepower and torque he said it depends on bore size and combo i would run.
depends on the bore size? there's only one bore size for a 347.... The cheapest quality 347 kit ive seen is $800, cheapest quality aluminum heads are around $1000, machine work usually is around $500.
Boy, I bet machine shops see $-signs when guys walk in asking "how much for a 347 stroker?" So your getting a 347 long block for $3200. I suppose that's okay, depending on what brand of internals are used. I've seen them going for a lot more than that. Of course you better have a good intake, carb, ignition, etc. to get the most out of that engine. Is there a particular reason you want/need a 347? Inch-for-inch, a 331 stroker is more durable long term (or so I've heard due to the slightly shorter stroke) and just about a powerful. But those are basically "race" engines; do you really need that much engine? (Is this a drag car? Street/strip? Hot-street? Cruiser?) Unless you're building a drag car or pretty serious street/strip car, you may think about a well rebuilt 302/351W with good iron heads (maybe ported/polished?), forged rotating assembly, hot cam, roller valvetrain, good ignition and fuel system, and plate nitrous system. Maybe it's not quite as powerful or doesn't rap-out so impressively as "stroker", but you'll probably have a more reliable, longer lasting motor for under $2K. Besides, you can just tell everyone it's a 347 stroker. Who's going to prove you wrong?!?!?! :bananaman
the engine will be for daily driving but also having street/strip hp. the cam will be comp cam any roller of my choice and the heads they use are dart heads only. as for bottom end i want to say scat he said but i am not 100%sure
Professionally assembled long block with Dart heads, SCAT internals, Comp roller valvetrain, for $3200 is probably in line w/ the current market, maybe a little under. You'll probably be around $4K turn-key (starter, carb, intake, ignition, wires, pumps, etc.) I'd still get a 331 stroker over the 347 (but I'm biased...)
It cost the same to build a 347 or 331, do the 347 and dont ever wonder about what if. Dont choke it with heads that dont flow and too small of an exhaust and give it a good intake and carb and you will be set to go.
there is a BIG diff, in the quality of parts (forged steel and cast iron cranks) and rods have a wide range as well . You can get a rotating assembly for 800.00 to 2800.00 So 3200.00 my not be a great deal and the cheaper rotating assembly will not hold up to the high rev's . Need to know what is going in to this motor you are being quoted Raymond
Thanx for the input I will get more info on the internals mainly the rotating assembly. But as for power steering intake and ignition I already have all that. What they are going to do they will take my 85non roller make it a roller block and build from there I do have the original block from 72 but I don't want to bored it or anything
How are they doing the roller conversion? With a small base circle cam? Or with the link style lifters? Scat makes affordable cast kits starting at 800. With a limit of 700 HP. Youll split the block before you make that much. And like stated the 331 and 347 Kits cost the same. Go big.
There is no substitute for cubic inches - and you wont get any argument from me on that point. However, there IS a benefit to the 331... The shorter stroke of the 331 is a better design. The longer stroke of the 347 can allow the piston to rock around a little at t.d.c. (plenty of info on this online) although many hi-end aftermarket manufacturers have taken steps to address this issue. Granted, if you are A/B-ing two identically equipped motors (331 vs 347) the 347 will produce higher hp/torque numbers at lower rpms. (Understanding the entire torque curve of the two engines is different.) However, for all practical purposes the 331 sacrifices very little in terms of total potential output. Now back to the first point; if you just want cubes get a 351W and rebuild it with forged internals. You'll spend less and have - IMO - a more powerful, longer lasting engine.
i did not know that! Thanks for the info. There is replacement for displacement though.... Power adders. Thats how those honda guys can get 400 lbs of tq out of 1.6 liter motors. Also to add to your point ive seen a dyno where they compared a 302 To an 347 that was the same in parts. And they made the same power, the only difference was that the 347 made it at lower rpms.
