Budget 350 Build Question....
Hello all iam new to register, and i have been reading from the forum alot ...You guys are very helpful and very wise with the sbc stuff.....
I have searched the posts and threads and cant seem to find what iam looking for,
Iam building a cheap (BUDGET) build 350 sbc, to last this summer, then in the fall it will come out, this year just to have some fun with and see what i can get it to run in the 1/4 mile,
this is the parts list i have available and on hand. and the setup now ofcourse..
350 4 BOLT MAIN BLOCK ,
Stock bottom end,
pistons , rods, etc..
"416" 305 heads,
comp cam xe 284h
edelbrock performer rpm intake,
currently have a edelbrock 750 carb
Its in a 85 s-10 reg cab pickup,
with a 8.8" rear end 3:73 w/locker.with the s10 conversion headers,
How will all this work out for me, it isnt together yet ....but i planned to use it all together and see what i can come up with for some 1/4 mile times, . i will also run some 26x8x15" slicks in the rear, when racing.
what do you all think, what issues do u see i will have?....too big of carb for this setup i think already... ???:welcome:
should run some nice 14s
what about with some better, or even vortec heads?
be specific and I can estimate better
What else do you need specifics for?...ill try my best to give more specifics?...
what would help or is hurting the combo , other than the 416 heads??
cr and deck height, stall speed tires type and size,truck weight
and you, experience driving, experience in suspension set up.type of suspension and suspension tuning. experience tuning
The 416 heads will work well for you if you fully port them first.
use a 1.94x 1.60 valve set in these heads. Don't be shy with the porting.
In stock form they are lame, like all the stock SBC heads. In fully home ported form they are actually pretty good.
if you are willing you can fill the exhaust egr ports in the center exhaust ports using old melted pistons
as a filling material.
This stops the cross talk between the center exhaust ports.
You can flat mill the heads to a 52cc chamber (to the edge of the 1.94 intake valve seat) to reaise the compression with a stock dished piston.
Or get some flat tops.
Get a 3500-4000 rpm stall converter. 9" -10" more is better.
More gear is better too. Don;t be shy with either.
A fully ported 416 head:
The XE284H-10 cam will work the best with the distributor locked out.
34 to 36deg Use a champion RV8C plug .035"
Pretty simple. Get some good valve springs so it can rev up. 110-120 seat 300-330 open. (.510" lift)
shim then as required.. ( deeper ex spring seats)
Drill and roll pin the rocker studs.
Use a thin felpro 1094 head gasket.
If you spend the time to port and prep these heads for your budget 350 it will work very well for you.
This is a pic of one of the many ported 305 head budget 350's I have done.
On a stock dished piston 350 a finished 52cc chamber and a .015" felpro gasket will get you a 10.50:1cr on
your budget 350. Just right for the XE284H-10 cam in your 350.
If you burp the wallet for a flat top piston finish the heads to 62cc. (10.50:1)
You can buy a compete summit 350 SBC rebuild kit with flat tops for $200.
Either way works and 10.50:1 is just right for this build. (92 octane)
On this one shown here all I did was re-hone and re-ring and bearing it, reusing the stock pistons. Ran very well.
no the carb is not too big. It is just right. Anything smaller will choke this motor.
Humm - severely cut heads(no sonic check done on head surface thickness)run at 10.5,with pump gas on cast iron heads,with valve train geo nightmare.Time to get a second opinion...........................
How about an isky Z-25 cam,used single plane,750 cfm carb like a 4779,9.7CR,with GM cast iron heads( they almost all flow 215 plus cfm) 1 5/8 headers,MSD type ignition,4.56 gears giving 120 mph top speed with 29 inch tires
The sonic check will not tell you anything. But will make the machinist richer for nothing.
I have cut many sets and never had one crack.
Do the 1.94" valve job first. As the mill limit is the edge of the new 1.94" valve seat in the head.
The net valvetrain geometry improves. its equal to a longer push rod.
See the pic. I actually build these engines. Have for many years.
This is a easy 12sec et performer.
How about it guys??. Now sonic checks don't work:rolleyes:.I do think a second opinion is in order here........
my machinists are not rich,the good ones,like I use, do very very good work and they do it for close to the same price as the shortcut machinists. The good machinists are in business and have to compete,what saves them is repeat business.
do you have to test things? depends I guess on your luck and reputation.
can I build a cheap 12 second car?define cheap
can I build you a cheap 12 second car? no
The sonic test tells you the thickness of the deck. It does not tell you whether the shaved deck will create any problem. All that is strickly (uneducated) opinion.
The deck thickness is not a issue or a problem . They don't crack there. They crack between the valve seats., when they do crack.
This is a easy 12sec performer when built right. But will not perform as it can if it gets dummied down by "experts and opinions". Shave the frittin heads right to the edge of the NEW intake valve seat (52cc) when using a factory dished 350 piston.
Or get flat tops (62cc)
This XE284H-10 cam needs compression and head flow. So it can work. You want 10.50:1cr
I can and do build cheap LOW COST 11-12 sec cars and you can too. Start by NOT sonic testing (wasting your limited money) your heads that belong in the garbage anyway. Anybody can build a $10,000 motor.
I can show you how to put this same combo in the 10's for peanuts.
The heads and details will make or break it. These heads work, when done right.
1000's and 1000's of racers shave their stock Chevy heas right down to the edge of the intake valve seat to get compression on a budget. Without a sonic test. Get real.
And SELF PORT port their stock Chevy heads (including the 305HO heads) to great effect without a flow bench.
You have a lot to learn Gary1. Hotrodding is a DIY sport.
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