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Author Topic:   A Challenge (?) for y'all
RC Racing
Dirt Maniac

Total posts: 144
posted February 23, 2003 11:22 PM
Here's the challenge/question: staying within the engine rules listed below, what are the tricks for getting the most USABLE horsepower AND for LONGEVITY? Here's hoping to see a lot of good ideas. Thanks

Claimer class, 2300#s after race

Engine: 360 cu in maximum Ford, Dodge, GM Zero deck height. 10 to 1 four valve relief cast pistons only. Open chamber cylinder heads 76' r later. 450 maximum lift hydraulic cam. 1.5 long slot steel rocker arms. No roller tips. No bronze bushings in lifter bore or custom lifters (stock type hydraulic lifters only). ***** in studs allowed. Guide plates are allowed. 120lb stock dia springs maximum stainless valves 1.94 intake & 1.50 exhaust. No angle mill. Steel timing chain. Stock crank and rods. No 6" rods in Chevy motors. A.R.P Rod, crank and head bolts and studs, Claimer oil pan and Maximum fluid damper allowed. Cast iron water pumps only. Cast iron intakes 76" or later only.

Power steering pump and res. must be stock and one unit.

Stock ignition only. Chevy HEI must remain in one unit. One battery. Alternator allowed

Transmission, Stock only, standard or automatic for make of car. Flywheel, clutch & pressure plate must be stock O.E.M. equipment for make of car. Automatics must remain stock with working full size torque converters. Full size stock steel fly wheel only.

Carburetor must be stock. Quadrajet or two barrel Holley for Chevy. No electric fuel pump. Stock mount Holley & Mallory allowed.

Headers must be Schoenfield #16100 1 5/8" x 3"

Starter must be stock.

Any belt drive pulley system. Or Stock pulley system together with electric fan in front of the radiator.

Pump gas only.

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RC Racing
Dirt Maniac

Total posts: 144
posted February 24, 2003 08:34 AM
Bringing this back up for discussion

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racer17j
Dirt Forum Champ
Total posts: 1565
posted February 24, 2003 09:20 AM UIN: 54865418
good bearings and good maintence

gahainsey
Dirt Full Roller

Total posts: 43
posted February 24, 2003 09:27 AM
try 2 1/2 inch collectors on the headers. Don't always think bigger is better on exhaust! 441 or 993 casting heads. maybe try 30 degree valve seats to maximize low lift flow

RC Racing
Dirt Maniac

Total posts: 144
posted February 24, 2003 10:03 AM
17j: could you be a bit more descriptive on "good maintenance". My normal preventive maintenance routine for the engine: change oil & filter every 2 races. What else do you suggest?

gahainsey: rules state the headers I must use. Thanks for the advice on the valves

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Flatlander
Dirt Freak

Total posts: 310
posted February 24, 2003 12:44 PM
I'd use vortec heads vortec intake get a custom ground cam to run with a 4412 run a powerglide behind it and just because you're headers are 3" collectors you can reduce the with an add on collector and tune them for best performance

istock59
Dirt Freak

Total posts: 237
posted February 24, 2003 01:12 PM
Maybe lighten up the engine internals (crank/rods/pistons) to get it to wind-up faster. Same thing with the rotating parts, tranny, driveshaft, rearend gears, axles, etc. Lighten them up too.

The vortecs would be a good idea, except they're not open-chamber like your rules require.

What about port work?

HRT187
Dirt Maniac

Total posts: 173
posted February 24, 2003 01:30 PM
quote:
Originally posted by gahainsey:
try 2 1/2 inch collectors on the headers. Don't always think bigger is better on exhaust! 441 or 993 casting heads. maybe try 30 degree valve seats to maximize low lift flow

At least a 14" collector with those too.

RC Racing
Dirt Maniac

Total posts: 144
posted February 24, 2003 01:33 PM
Sorry, should have listed this the 1st time. Legal heads are:
333882 376445 462624 3927185
3932441 3973487 3998993 3998997
X HEADS ARE NOT LEGAL

So no vortecs (to bad too cuz I have a set laying around)
Y'all ever heard of squaring/aligning the lifter bores to pick up hp?

Keep those ideas/tips coming. Appreciate it.

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HRT187
Dirt Maniac

Total posts: 173
posted February 24, 2003 01:36 PM
1st thought is, how are they gonna check all that stuff?

2nd I agre with vortec heads or L98 corvette heads (it never said no aluminum) these are great heads, easy to make a mot of compression with stock flat tops too.

3rd if said no more than 360cubes, but it didn't say how, so you can still build a big bore short stroke engine (305/327 crank with a 400 block). You'll have to explain that it's not a 400 and probably make them pump it to prove your case.

Last I've got about 100 of the rocker arms that class has to run, I'll give them to you for shipping and a case of coca-cola. Got tons of stock cranks and rods too.

Eljojo
Dirt Freak

Total posts: 273
posted February 24, 2003 07:10 PM
HRT 187 is right about putting a 307 crank in a 400 block. As light as you are required to run you'll be very happy with that combo. My cyl head choice would be----441 487 or 993 none other!

[This message has been edited by Eljojo (edited February 26, 2003).]

Flatlander
Dirt Freak

Total posts: 310
posted February 24, 2003 09:40 PM
Whats the claim price and protestcost and rules

RC Racing
Dirt Maniac

Total posts: 144
posted February 25, 2003 01:59 AM
Trying to keep this topic alive a little longer....

Flatlander, will post answer Tuesday 2/25.

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Flatlander
Dirt Freak

Total posts: 310
posted February 25, 2003 11:56 PM
with a 500 swap rule I would run 441 heads and mill them down to the min cc I would use ***** in studs and guide plates and I would still use the 4412 your cam man needs to know this I would get a set of KB pistons with the thin ringsand have a mach liten it as much as possible and have a cam special profiled with my liftI and go ahead and run at least a 1.6ex valve,use an in distributer high output coil and use a powerglide with a 10" convertor

[This message has been edited by Flatlander (edited February 26, 2003).]

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