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Old 01-14-2009, 05:58 PM
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Originally Posted by 31fordcoupe
Ok. That settles it. I'll buy the 2 bolt block tonight. The heads that come with it are 346236 castings. Does anyone know if this series of heads came with screw in studs and push rod guides? The heads that I looked at last night had them. Just curious.
All Gen 4 BBC's came with 7/16" screw in studs and guide plates. The Gen 5-6 will easy convert to screw in studs.

The wide parting line crank is steel and just make sure you mag it most of the steel 4" stock cranks I have come across in the last 10 years have been cracked in the main bearing area.

My last little BBC was a 461 with a cast crank, 2 bolt mains, 3/8 stock rods and heavy TRW pistons the junker made 630 HP and I shifted it at 7200 without any problems for 3 years.

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Old 01-15-2009, 12:13 PM
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Originally Posted by 31fordcoupe
If I had $15,000 to spend on a motor we wouldn't even be having this conversation.

If it is that critical, I will spend the extra $200 dollars and I will get the 4 bolt.
The 4 bolt is only 200 more ... NOT 15 grand
Everyone agrees that a 4 bolt is more desirable. It is worth 200 more to you ?? It is to ... ME ...

I quit building BBC's a about 20 years ago.
At the time I was doing it ... the 4 bolt blocks were better centered and more closely selected in my opinion. Maybe the customers I was working for JUST bought their GOOD blocks in for boring and decking and left the not as well centered blocks at home ...
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Old 01-15-2009, 12:41 PM
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$200 here, $200 there, pretty soon it starts to add up to real money. You can spend a lot of money on an engine replacing perfectly adequate components with "better" parts you don't really need.

Like somebody said earlier, the whole 2 vs. 4 bolt main question is really a Chevy thing. The first car I hotrodded was a '68 Ranchero back in the '70s. According to the people trying to sell me parts now that weren't available then, there is no way that 302 with its puny 2 bolt mains could have lived long enough to eat all those C4 trannies. All budgets are limited. As it turned out, I finally ran out of cash trying to keep the rest of the drivetrain together. The engine itself never failed me.

It turned out well, though. After I got rid of the Ranchero my next car was a '68 Charger with a 440S. That thing was awesome. I'm still kicking myself for selling it when I joined the Navy. Who knew then that in a few short years I'd never be able to afford to buy it back, or one like it?
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Old 04-23-2013, 02:14 AM
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Are the ARP rod bolts necessary if you don't rev higher than 5500 rpm. Is the stress on the rods from horsepower or high rpm (is engine acceleration a factor even if the rpm are held to a 5500 redline)
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