347 build for my 64.5 mustang

[blykins]

Depends on which block it is.  The Man O' War block is really heavy.  FRPP block is probably the lightest between what's offered now.  I just did a 363 with one but didn't weigh it.  That's another good reason to go with an aftermarket block....free cubes.   A 363 with AFR 185cc heads, Performer RPM Air Gap and a little 220-ish @ .050" hydraulic roller cam will make 500 hp.

[blykins]

FRPP 8.200" block:



World 8.200" block:

[70tp]

Brent: when using the FRPP block with a 3.4” stroke , do you see any problems with the bottom of the cylinders being shorter than some of the other aftermarket blocks?  I’ve been told that the frpp blocks have too short of a cylinder skirt to be reliable long term or can have accelerated piston skirt wear. 

[blykins]

Brent: when using the FRPP block with a 3.4” stroke , do you see any problems with the bottom of the cylinders being shorter than some of the other aftermarket blocks?  I’ve been told that the frpp blocks have too short of a cylinder skirt to be reliable long term or can have accelerated piston skirt wear.

No sir, haven't seen that.

[Stangman]

Looks like more clamping force for heads in the world block and more cooling for the FRPP. Do you have a preference.

[blykins]

There's only one head that will bolt up using all the bolt holes on the World block and it's not a head to write home about. 

Cooling has never been an issue, so I can't really say that the bigger holes are a plus. 

One thing I don't like about the FRPP block is that the caps aren't billet and the bolts are just regular bolts (not like ARP).   Now granted, I've made 800 hp with the 9.200" deck BOSS block, so it must not be an issue, but it just doesn't look as professional as the Dart and World blocks. 

FWIW, I haven't seen a Dart block in so long, I've forgotten what they look like.  They haven't been available in about 2 years.

[Heo]

There's only one head that will bolt up using all the bolt holes on the World block and it's not a head to write home about. 

Cooling has never been an issue, so I can't really say that the bigger holes are a plus. 

One thing I don't like about the FRPP block is that the caps aren't billet and the bolts are just regular bolts (not like ARP).   Now granted, I've made 800 hp with the 9.200" deck BOSS block, so it must not be an issue, but it just doesn't look as professional as the Dart and World blocks. 

FWIW, I haven't seen a Dart block in so long, I've forgotten what they look like.  They haven't been available in about 2 years.

On my way home now and i stopped over in Stockholm at may friend Ollie. He had just recieved a new Dart block out of the new castings
it was a beauty with realy thick cyl walls.But he have waited one and a half year. Got pics i can download tomorrow

[Rory428]

I weighed both my SBF 331, which used a 1973 production block, and my Dart blocked 347, and the 347 was 35 pounds heavier. Be aware, that these were complete carb to pan engines, and in addition to the differences between the 2 blocks, there were some other pieces that were different between the 2 engines. The 331 had a cast crank, stock timing cover and water pump (aluminum 5.0 Mustang pump), Victor Jr. intake and Comp steel roller rockers, where the 347 has a steel crank, a Jesel timing belt drive and Meziere electric water pump, and a Parker Funnel Web intake and Crower aluminum shaft rockers. Not sure how much lighter the production 5.0 hyd roller blocks were than the early 70s 302 blocks, after the roller block broke, I went with a 73 block, I never compared the weights of the roller block to the 73 block.

[Heo]

Darts new "302" block

[machoneman]

I weighed both my SBF 331, which used a 1973 production block, and my Dart blocked 347, and the 347 was 35 pounds heavier. Be aware, that these were complete carb to pan engines, and in addition to the differences between the 2 blocks, there were some other pieces that were different between the 2 engines. The 331 had a cast crank, stock timing cover and water pump (aluminum 5.0 Mustang pump), Victor Jr. intake and Comp steel roller rockers, where the 347 has a steel crank, a Jesel timing belt drive and Meziere electric water pump, and a Parker Funnel Web intake and Crower aluminum shaft rockers. Not sure how much lighter the production 5.0 hyd roller blocks were than the early 70s 302 blocks, after the roller block broke, I went with a 73 block, I never compared the weights of the roller block to the 73 block.

I went back to look at the old 'Net 54 site for block weights. Our own Falcon67 stated (way back in 2006!) that a D2 1974 W block weighed 165 lbs. with caps, cam bearings and freeze plugs.

[Rory428]

Pretty sure the extra deck height of a 351W block would make it a fair bit heavier than a 302 block.