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Old 09-18-2008, 07:38 PM
oldbogie oldbogie is offline
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Quote:
Originally Posted by TexasTechX1
So i'm rebuilding the 350 chevy V8 in my garage for the Rat Rod (My First Hot Rod!... project. Nothing crazy here, I need something thats decent on gas and reliable, while I want it to be powerful its not to big of a concern, the vehicle will weigh about 2400lbs have a borg warner 4-speed and 3.08 rear end. So even a 300 horse V8 will still make it one hell of a ride.

But I have two sets of cylinder heads, 882's (casting# 333882) and 193's (casting# 14102193). Both have 1.94" intake and 1.50" exhaust valves but the 882's are the first of the 'smog' heads, they flow well and are not the 'lighter' castings, but it does have the larger 76cc chambers, which means I will barley break 9:1 compression ratio with the thinnest of head gaskets. On the other hand the 193's have 64cc chambers and with standard head gaskets i get about 9.7:1 comprsion ratio, but they are the TBI 'swirl port' heads, their low lift flow is great for economy and torque but without many mods you cant get them to rev past 5000rpm. I have provided some flow data below, both at 28" of H2O and both with 1.94/1.50 valves.

882 heads
lift/intake/exhaust
.100-70.00-59.00
.200-125.0-109.0
.300-175.0-136.0
.400-204.0-143.0
.500-205.0-144.0
.600-206.0-145.0

193 heads
lift/intake/exhaust
.100-70.70-47.80
.200-124.0-85.10
.300-146.5-112.3
.400-154.7-125.0
.500-160.4-129.5
.600-(flow is not aval.)

I have the DYNO2000 sim and the predictions are as follows:
355 with 9.67:1cr, summit 1103 cam (http://static.summitracing.com/globa.../sum-1103.pdf), with Offy 360 intake and carter perf series 625cfm 4-bbl. HEI ignition and 1.5" block huggers with 2.5" collectors running into a 3.0" y-pipe and a flowmaster 80-series muffler.
300hp at 4500rpm
380lb/ft at 3000rpm

OR if I were to do the exact same set up just with the 882 heads, which would drop the cr to 9:1.
330hp at 5000rpm
380lb/ft at 3500rpm

PLEASE NOTE: these numbers are approx. and at the fly, NOT the rear wheels... I only wish I had a 2400lb hot rod that made 330rwhp!

the 193 came off of a well running 93 chevy pickup, just a disasembly, cleaning and maybe a slight decking to flatten the gasket surface and they would bolt right on with no problems... but I HATE center bolt valve covers.

The 882 came off of a running 75 corvette but have been sitting, they would need to be dipped and cleaned also and I would have to get some valves or would the valves from the 193 heads work fine?

What would YOU do?
CHP did a series starting with a Goodwrench 350 that used open chamber heads very similar to your 882s. With a thin gasket and a cleaning pass on the mill, a pocket porting job and a Comp XE268H cam, with an aluminum two plane intake and 4 barrel plus shorty headers they pulled 335 around 5 grand at the flywheel. Compression was around 8.5 with OEM round dish pistons that even had 4 valve relief cuts in 'em.

Makes your dream wheel calculations look reasonable.



Bogie
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