LS compared to BBC

[SuperBuickGuy]

Originally Posted by Tom

How that has any relevance to a big block vs LS swap is beyond me.

op- 700hp does not require boost, but yes it requires dollars. Same thing with big blocks though. Remember an LS can go to 454cid.

a core BBC 4 bolt main is available to me for $500 (actually, $120 if I simply spend the gas to go get one I have a few miles away); the cheapest 6.0 I've seen 2k and the LSx block required for a 454 build (not including the 10k of machining) is $2500.... dollar for dollar I think can build more power with a BBC.

BBC does have rpm limitations because of their valve train, but weight is almost a wash since the 6.0 iron block about the same as a bare bbc 225 for LS, 250 for bbc.

Not just that, but anywhere about 500 hp and head gaskets tend to be the fuses in BBC and LS motors... so as car flippers say, you make your money when you buy the project. What I'm coming up with between the two is I can get a rebuilt 454 for $3000, heads for another $1500 and everything for another $1500 (intake, etc).... with an LS motor, it's about 2k-3k more.

But fuel economy is a thing that factors in this, and in that the LS rules....

I almost like the implied challenge to see if I can make a bbc get high-teens/low 20s and still make the hp number in a C10 pickup... efi and electronic ignition along with smart head choices.... dunno (thinking out loud more then anything else).... so far about the best I've ever got out of a bbc is 13.... that said, my 2006 GTO with the 6 speed got 14 around town at squeaked 17 on the highway...