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Old 05-21-2012, 02:11 PM
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SBC performer RPM heads will this work ?

Theres a chance I may be able to get my hands on a pair of edelbrock rpm heads for similar money to my building up a pair or rhs pro torkers,
but wanted to know if they will work with my motor?

the heads are the performer rpm 6073 64cc heads.

the engine is a 2 bolt mains 357
new cast iron eagle crank
speed pro hypertectic flat top pistons 4v reliefs
Performer plus cam.
performer inlet manifold
tube headers
600cfm holley

I had been building engine on the assumption of 300hp with the pro torker 12402 heads 67cc chambers giving a static compression ratio of around 9.5.1

but running the sums the 64cc rpms would up it to around 10.1.1 static c/r

Do you think I will encounter problems with piston to valve clearance?
would that small cam run ok with the heads? not to bothered if not making full potential as can always upgrade at later date, or will i need to change this out?
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Old 05-21-2012, 04:06 PM
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Unlikely you will have PV clearance issues, but you have to check this no matter what.

More importantly what cam shaft? If you were targeting 300HP it sounds like a mild cam and that will drive your dynamic compression up, so starting off with a static compression of 10.1:1 seems pretty high. Are you wanting to run 87 octane pump gas? Are you already dead set on your pistons?

Check this link to match your cam and compression ratios (note the intake duration here is listed in degrees at .050" lift):
http://www.crankshaftcoalition.com/w..._compatibility
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Old 05-21-2012, 04:23 PM
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Quote:
Originally Posted by Silver Surfer
Unlikely you will have PV clearance issues, but you have to check this no matter what.

More importantly what cam shaft? If you were targeting 300HP it sounds like a mild cam and that will drive your dynamic compression up, so starting off with a static compression of 10.1:1 seems pretty high. Are you wanting to run 87 octane pump gas? Are you already dead set on your pistons?

Check this link to match your cam and compression ratios (note the intake duration here is listed in degrees at .050" lift):
http://www.crankshaftcoalition.com/w..._compatibility
the short blocks built & on the stand, so that is a set constant, however I am willing to swap cams if required.
the cam shaft fitted has specs as follows

BY2291730 262-400 1957-94 "Performer" flat tappet camshaft- idle to 5500rpm
Duration @ .050" lift = In 204, Ex 214, Valve lift = In .420", Ex .443", Lobe sep 112.

standard uk fuel is 95 ron super unleaded is 98ron
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Old 05-22-2012, 09:07 AM
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The performer rpm heads will work very well for you.
You can use a bit bigger cam 211 to 218 @.050" if you want more power.

You have to measure the piston deck height at TDC and cc the heads to get a accurate compression ratio.
The hi-rise Performer RPM intake manifold is a much better intake manifold than the performer.

Last edited by F-BIRD'88; 05-22-2012 at 09:15 AM.
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Old 05-22-2012, 09:14 AM
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Quote:
Originally Posted by F-BIRD'88
The performer rpm heads will work very well for you.
I'll need to change the cam though right? Something longer duration .
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Old 05-22-2012, 09:18 AM
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Quote:
Originally Posted by swompz
I'll need to change the cam though right? Something longer duration .
Its up to you. You can have more power and performance with a bit bigger cam
in that motor.

Without more specific info about the car and purpose I cannot give a cam recommendation.
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Old 05-22-2012, 10:23 AM
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Quote:
Originally Posted by F-BIRD'88
Its up to you. You can have more power and performance with a bit bigger cam
in that motor.

Without more specific info about the car and purpose I cannot give a cam recommendation.
Ah right, I was led to believe that with my mild cam & 10.1 static compression the dynamic would be to much & not work.

The engine will be fitted to a little 1956 ford popular , old sit up & beg hotrod, mostly street driving
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Old 05-22-2012, 11:16 AM
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This is a very light car.

I don;t think you will have a problem at all but you could degree and retard the present cam by about 4 to 5deg. ( true straight up.)

The intake would close at 34deg ABDC instead of 29deg.
do not guess, degree the cam and then move it.

This will tend to tame the cylinder pressure and extend the power band a bit.
( later intake valve closing point) The effect is mild.

change the cam to a 214-224 112 cam ( next one up in this series)
Can go straight up phasing too.
This cam is very torky mild moderate street cam with 10:1 cr.
good overall cruise, power and mileage.

More power than the one you got now.

go up as high as 224@.050"
EG: summit cam set #SUM-K00132
nice hot rod idle good cruise and power. a bit more topend
sweet street cruiser cam w power.

What will the rear gear ratio and tire diameter be?
transmission?

i have found that with proper tune and premimum pump gas as long as the true cr is 10.5 or less, it does not matter which cam you got in the motor.

The tuneup details (carb jetting, mech and vac adv timing curve, spark plug choice. Proper engine cooling system. details make much mroe of a difference in wether the engine is going to be detonation sensitive.
The specific brand of fuel is also a big factor. Some are much better than others.

what tis the piston deck height at TDC?

Again I would not sweat over this.
If the edelbrock heads are in good condition and at a good price I would go for it.
They work very well.

Last edited by F-BIRD'88; 05-22-2012 at 11:44 AM.
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