Windsor/302 blocks
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Originally Posted by Flastangs
They are WRONG...R blocks are not repopped early blocks. They are "NASCAR" style blocks..much thicker than early blocks.
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The 302 is a windsor block. The 351's could be windsor or cleavland style. Some were "351C's" and others were 351M's. All non-windors had canted valves. So any production non-351C/351M are windsor.
That being said, the early 351 windsors are "said" to have more meat but are 9.49 or something less than 9.5 deck height. The made in Mexico 302 blocks "Hecho en Mexico" seem to be the the ticket for more meat. R302 says 4-bolt race block to me.
There is a good thread on turbomustangs is you do a search on mexican blocks. They are like the early 289 hipo blocks. Only problem with the 289 blocks is that they do not seem to be good for strokers because of the shorter cylinder walls. So the 60's blocks will have a "C" and the 70's will have a "D" in the casting numbers. Unless it is a Boss 302 block. Some replacement Boss 302's had a "Z".
That is where I am confused when you refer to a "R" 302 block that is not a 6010-? FRPP block.
Correct me if I am wrong to keep the thread alive.
That being said, the early 351 windsors are "said" to have more meat but are 9.49 or something less than 9.5 deck height. The made in Mexico 302 blocks "Hecho en Mexico" seem to be the the ticket for more meat. R302 says 4-bolt race block to me.
There is a good thread on turbomustangs is you do a search on mexican blocks. They are like the early 289 hipo blocks. Only problem with the 289 blocks is that they do not seem to be good for strokers because of the shorter cylinder walls. So the 60's blocks will have a "C" and the 70's will have a "D" in the casting numbers. Unless it is a Boss 302 block. Some replacement Boss 302's had a "Z".
That is where I am confused when you refer to a "R" 302 block that is not a 6010-? FRPP block.
Correct me if I am wrong to keep the thread alive.
is doing your girlfriend
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actually a 351W and a 302 block are almost identical except for the bigger mains and the taller deck heigth. a 351C and a 351W can swap heads with a few mods, a 351M has nothing compatible with a 351W
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302 and 351W also have different oil pans. 351m/400m heads are all open chamber style as with the 351c 2v heads. All 351m's and 400m's are considered open chamber and can be swaped with 351c 2v heads. Some 351c ho's had open chamber 4v heads. 351c 4v "4 barrel carb" are closed chamber heads. So are the Aussie heads. The later 400m had hardened exhaust seats. 351 windsor has a taller dizzy than a 302. 351c/351m/400m have a 429/460 style dizzy. 351m/400m have 429/460 style bell housings. You can swap 351c 4v/2v, 351 Aussie 2v, 351m/400m heads on a 302 or 351 windsor block. You need to modify the water passages, and either use a Street Boss/Track Boss intake, or use adapter plates for windsor style intake maniflods. Plus the piston issue. Silvolite made a special piston for either the 351W or 302 swap. The cheap way on the 302's was to use a 289 rod and Boss 302 pistons. Boss 302 rods and 289 rods are the same lenght. 302 rods are different.
is doing your girlfriend
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the reason the 302 and 351 uses a differnt pan is that the rear main is bigger, the radius of the 302 pan will not fit over the rear main, other than that the pans are identical
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The 69-73 blocks, 84-93 Mexican blocks, and Motorsport Sportsman blocks are all higher nickel count blocks and can take more power. How much ? 600-650 is supposed to be the upper level of the safe zone. A good but rare block is the 302 Boss block, it had factory 4-bolt mains and lots of nickel but they are hard to find and when you do most have been bored out, trust must I found out first hand. 
As far as the older blocks vs. the new R blocks I purchased well here is a good comparison for you. I just wish I would have taken some side photos and a few with the blocks a little closer but this should give you a good idea. Not to mention the R's are four bolt mains.
As far as the older blocks vs. the new R blocks I purchased well here is a good comparison for you. I just wish I would have taken some side photos and a few with the blocks a little closer but this should give you a good idea. Not to mention the R's are four bolt mains.
