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Author Topic:   modified 361 motor rule help
md3 Racing
Dirt Full Roller

Total posts: 32
posted October 28, 2005 02:47 PM  
im looking at getting out of street stock and going to a e-mod that has a CHEVY 361 max rule this is what the tell you Must use steel block---Must have flat top or dish pistons---Any cast Iron cylinder head===Intake manifold can be aluminum===No titanium, billet or aluminum rods. Crankshaft must be cast or steel.===Carb. must be Holley 4412===No roller or mushroom cams.==== Stock or MSD type ignition. No mags===
does any one have any sugestions so i can acheave the max out of my motor like bore and stroke or even a good place to buy a 361


15a
Dirt Freak

Total posts: 354
posted October 28, 2005 05:06 PM  
How about a standard bore 350 with a 3 9/16" crank. Use flat top 6" rod pistons with about .030 machined off the top.
.7854x4.00x4.00x3.5625x8=358.1424 CI
.020 oversize bore would give you 361.732 CI

20crew
Dirt Roller

Total posts: 18
posted October 28, 2005 09:04 PM  
we used run under simular rules in the prostock class only no cube or piston rule.this is what we did and won some races.
with the 4412 carb you have a cork in the intake so use longest stroke you can & still be legal and as much comp. as possible .
this will pull on the intake harder[more vacume] and fill the cylinder better. try not to turn it any hardder than you have too. the more rpm the less time there is to fill the cylinder .
open the valves as far as you can as fast as you can and close them as fast as you can. good valves and springs are a must these are the most abused parts in a restricted engine.
use good rings too seal the cylinders as tight as possible to create more vacume in the intake.

racer17j
Dirt Forum Champ
Total posts: 5390
posted October 29, 2005 08:46 AM  
glad i'm not running those rules ours are close but we have to run stock intake and heads and 9-1 comp and no msd's thats where the big money is going to go on those. build a 6 in rod 350 with 2 brow pistons and 50cc heads. they aren't saving you guys any money without a limit on compression and sticking with stock castings

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