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Wasn't really trying to be a smart ass. The 302 has a couple of well documented problems which the 351 fixes, blocks break, cranks break, and block deck moves around blowing head gaskets.
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Seen a 351W split on Pinks last week.
later Dennis |
5.0 magazine has an article on the new BOSS block. Much beefier than the current R block. You should see the size of the 4 bolt mains! Supposedly, it's a little cheaper than the R block too. :JEKYLHYDE
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I know guys that can break an anvil with a ballpeen. My primary power adder is light weight, the car will have to have balast added to make EM minimum weight. I like the looks of the "New" Boss block but the added strength would have to add weight which narrows the weight gap between the 5.0 & 5.7. In addition it adds nearly 2k to the build cost. I bought a fresh 5.7 from a wrecked F150 for $150 that, with a cam change, will be run as bought and a roller core (broken piston?) for $125 which will have a stroker crank and pistons added. The reality, other than bragging rights, at less than 1800 lb and over 500 hp the amount of time that you are on it will be limited.
http://forums.corner-carvers.com/showthread.php?t=27451 |
choice
it sort of depends whether you believe low end torque is your buddy, or not.
rrd |
IMO, the big block style torque combined with the lightness of an aluminum head small block is the best of both worlds...you just don't want or need to get "silly" with the combo, it doesn't need a huge cam or super high comprersssion to get it done. A 470-510 hp 408-427 can be built with a good set of heads that flow about ~275cfm on the intakes, 1 7/8" headers and a cam in the mid 230's @.050 in a solid 9.5-10.5:1 shortblock will idle at 850rpm, make massive torque and pull cleanly to about 6200, plenty for a dual purpose motor and you'll have rock solid reliability for a driver.
So you can easily match or exceed the power of an original Street 427 and still have a docile and reliable motor that weighs about the same as an original all-iron 289...Though I love the revs of a 7500 plus smaller cube motor, I love the Thrust of that low end grunt that 427 cubes gives you at any RPM even more; to get that massive "no effort" acceleration combined with the better-balanced handling and braking of a smallblock is really tough to beat IMO. |
You asked about larger, but I'd say smaller with that combo. The 331engine that Clois mentioned has a better rod angle and has less thrust on the cylinder wall, which is pretty important in a stock block. The Boss block you mentioned is a good upgrade if you choose to stay at 347, however, in the crate engines that Ford will offer in that configuration they are only offering( at least initially)a 331 max size. It is supposed to be 500hp, if I recall. So while I do like the small block, I think durability will be less than with a 331.
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Handling and ballance
Quote:
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Build the motor you have. Don't second guess yourself. You will always scare the crap out of yourself in any cobra. A high compression 347 sound awsome. Once you get on the road with your cobra you won't care what motor you have until you run into another cobra! All cobras are the same. Enough power to tool around town and crush anything made in Detroit at any moment.
Sid |
347
Hi Tech
Phil What cam are you going to use? Dwight |
Cam for 347
I ordered a XE282HR Cam with a custom grind. They are changing the lobe sep from 112 to 110 for the carb,
here are the specs: http://www.compcams.com/Technical/Se...umber=35-522-8 |
More Stuff
I have a Proform 750 (mech secondaries) for the 347. AFR 185's on the way. The cam helped make that decision for me (see my last port for cam specs, I got the same cam custom ground with a 110 lobe sep). The GT-40x heads are heading to ebay. Even with the incredible port job, I believe the AFR's will be better.
I sure hope the stock roller block holds together, I'm shooting for 450hp at the flywheel. Does anyone know if the oil valley girdle works? What about the oil pump, I read somewhere a HV oil pump puts lots of strain on the distributor gear. Would a standard one work better? |
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