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Author Topic:   big block vs small block
malden_mayhem
Dirt Roller

Total posts: 16
posted August 18, 2002 04:36 PM
i have a 307 small block in my olds. im in search of more power and have found a 403, would the big block be too heavy and make the car slide over the turn or will it put us in the front of the pack?

racer17j
Dirt Forum Champ
Total posts: 1565
posted August 18, 2002 09:00 PM UIN: 54865418
most of theses cars don't handle all that well anyway so i don't see where it would hurt you at all most of the fast guys around theses parts are all running over 400 cid engines

malden_mayhem
Dirt Roller

Total posts: 16
posted August 19, 2002 06:54 PM
i see your point, let the big dog eat!


ryan
Dirt Freak

Total posts: 430
posted August 19, 2002 08:45 PM
We ran a 403 in our cruiser and it had tons of torque till it blew after two nights

teenwolfnorcator
Dirt Roller

Total posts: 12
posted August 20, 2002 12:02 PM
i would say if u have a good small block then that is what i would run. in the area where we race there was only one car that that ran a big block. it was a 455 that was built rather well. if u can get heavy enought suspension to support the extra weight i would prefer a good small block any day

racer17j
Dirt Forum Champ
Total posts: 1565
posted August 20, 2002 12:13 PM UIN: 54865418
i forgot to ask what size track you are running on they run on 1/2 miles here with those big blocks but on a 1/4 a small block would still work pretty good like a 350 rocket but that 307 isn't enough to pull a cruiser car

teenwolfnorcator
Dirt Roller

Total posts: 12
posted August 22, 2002 03:13 PM
does the tracks u run at have the claim rule still. at our track they dropped the claims and made us run restrictor plates. so now every body has basically hobby motors. and they are all small blocks. our primary track is a 1/2 mile, and are still running around 60 to 70 mph with ours so i think a small block can be sufficient.

[This message has been edited by teenwolfnorcator (edited August 22, 2002).]

malden_mayhem
Dirt Roller

Total posts: 16
posted August 25, 2002 05:23 PM
our track is a 3/8 mile oval. i talked to some guys, and they say that there are only a few cars with less than a 400. i think i will try a 455 or 403. they do still have the claim rule at our track, but no body believes in it. thanks for all your help.

redneck bubbas racing
Dirt Freak

Total posts: 213
posted August 27, 2002 10:46 PM
Just a thought that no one has bothered to point out to you yet. The Olds 260,307,350,403,and 455 are all the same extrernal size. This means that if it does weigh more its only a very little bit,maybe 20 lbs. Run the 403, its a great motor.

teenwolfnorcator
Dirt Roller

Total posts: 12
posted August 30, 2002 01:39 PM
the only reason i brought up the claim rule, is that maybe u can build up a good motor to take the rpms, and not have to worry about losing it. but good luck in what ever u choose.

[This message has been edited by teenwolfnorcator (edited August 30, 2002).]

malden_mayhem
Dirt Roller

Total posts: 16
posted September 01, 2002 09:15 PM
thanks a lot for all the info. our points season just ended friday, so now it is all for $hi+s and giggles. thatnk again

cruiser88
Dirt Roller

Total posts: 19
posted September 11, 2002 10:19 AM
We've been switching back and forth between or 455 and 403 all season. The 455s and 425 are larger then the 403 and smaller small blocks. With the big blocks, if you hit or get hit fairly hard in the right front, the right front frame rail will snap the passanger side exhaust manifold, w/the small blocks they're is plenty of room betweent he frame rail and manifold. You can also just tell by looking at them that one is larger.

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