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10-27-2007 08:14 AM #1
SBC Heads
I'm in the planning stages of building my next SBC 350. My question is, I'm looking for a set of heads that will give me some good street performance . I'm going with a full roller cam, nothing to big Comp 224/230 degree hydraulic roller performer rpm intake ( May be smaller ), edelbrok 600 cfm carb and headers Msd ready to run dist, 700r4 trans with 373 gears. 17" wheels.
I,m looking for suggestions on a decent set of heads that would be good for street performance, It will never see the track. Are the Vortec Heads as good as RHS, Pro Comp, etc, good for my application. I do not want to spend $1,500 on a set of heads that will not fit my needs.
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10-27-2007 08:36 AM #2
you might want to try edelbrock. they have excellent products and decent prices. they can match your setup with the correct heads to use.BARB
LET THE FUN BEGIN
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10-27-2007 05:18 PM #3
Originally Posted by Jim Standley
I would keep the RPM Performer.
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10-27-2007 07:17 PM #4
Eric, 64 or 76 cc ?
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10-28-2007 09:01 AM #5
Originally Posted by Jim Standley
A flat top piston like a Speed Prp L2256f will give you 9.75 to 1 for a comp ratio with 64 cc heads.
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10-30-2007 05:26 AM #6
The valves won't make much of a difference to the performance on a street engine. At low lift the shrouding on the long side turn out of the intake runner is higher, so airflow will actually be decreased with a BIGGER valve. Big valves only help on higher lift applications or on high-RPM applications where fast, high volume breathing is required. If you're not planning to race it I would stay with the smaller valves, they also leave more material between the valves, where most head cracks appear. Chose a good chamber shape and valve seat shape (maybe try a 30° seat, good for low-lift flow), almost all of the large chamber heads have open chambers with less quench area (that's where the chamber is flat and parallel to the piston and thus squeezes mixture into the main chamber on the compression stroke, this puts off detonation. That's generally not good for performance.
But a couple of questions:
What RPM are you aiming at?
What HP do you want to reach?
Really only street?
How heavy is the vehicle?
Are you interested in mileage?
When we know this we can give you a bit of a better estimate on the heads you want to use. And don't forget, the parts most crucial to performance are heads and cam, and they have to match up nicely. It's easy to get an engine to starve at 3500 RPM, manage 8mpg and reach 200 ftlbs of torque with a set of $ 2.000 heads... But it's also possible to get 300HP out of a set of $ 50 rebuilt junkyard heads, if you match the crucial parts together nicely...
Give us some more info and we'll give you some more help
MaxHarharhar...
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10-30-2007 07:21 AM #7
Originally Posted by MadMax
If he runs with stock heads I would guess he would give up 30-40 hp.
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10-27-2007 07:29 PM #8
the cc of the head chamber would have to do with the pistons you run for what you want to see for cr the iron eagles or the pbm iron heads of 180intake cc should be okLast edited by pat mccarthy; 10-27-2007 at 07:40 PM.
Irish Diplomacy ..the ability to tell someone to go to Hell ,,So that they will look forward to to the trip
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10-28-2007 06:55 AM #9
If I went with the 64cc what are the advantages of having the larger 202/160 valves compared to the smaller 194/150 valves ?
Good to have her home finally, still need to go back and give her another polish after messing with the engine stuff. Made it up to Idaho. Also a local show.
New guy from Utah.