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Old 04-25-2006, 08:14 AM
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BBC oval port v. rectangle port

A friend of mine is wanting to build a 427 Chevy for the strip. He has 2 sets of heads, one oval, the other rectangular, which would be best? Any suggestions on a build (cam, compression, intake, etc) which would put him in the 10 second range witha 70 Nova? He's gotten more opinions from so many people I thought I'd run it by some of the gurus here, Also maybe a few opinions on s.b.c. vs bbc for the strip. Thanks, Dan

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Old 04-25-2006, 09:20 AM
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WOW.... thats a loaded question.... I doubt there will be 100 % agreement here either... You may have more opinions then he has L.O.L.

First thing for me would be to know what the numbers are of each head???

Then if it's a race only engine??? what's the weight of the car is???

If he is only looking for 10's then either head should work,, but does he want the most hp he can get??? Or is it a bracket deal where he only needs a certin ET????

The rectangle port heads have gotten a bad rep over the years, but it's because of application, not because there are a bad head...

I't had to give cam, compression, etc numbers with out some more detail of what he wants...


keith
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Old 04-25-2006, 09:38 AM
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bbc v sbc

you will have more money in a big block than you would a small block; my 355 nova runs 10.30 with no power adder
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Old 04-25-2006, 07:52 PM
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Here's a list of parts he has in his posession. No rectangular heads now though. Any suggestions on what to keep? And cam suggestions.
1) Weiand Rectangle port intake Model WCPSQ Dual Plane.
2) Edelbrock Torker II Single Plane Hi-Rise TM2R Rectangle
Port Match ported.
3) Holley Strip Dominator Sinle Pane Oval Port
4) Holley Strip DominatorSingle Plane Rectangle Port
5) Edelbrock Street Tunnel Ram with 2 - 600 cfm Holleys. Carbs have NOT been wet since rebuilt.
6) Isky Cam and Kit Part # 396277 cam, lifters (solid, flat tappet, Dual valve Springs and Poly Locks, spring Shims STILL in box, NEVER opened. Duration 310 degrees,
264@ .050 , .590 lift, 108 lobe center, lash is .028 I & E.
7) Cyl. Heads casting #,s 397215 and 397216 Cast Iron Oval Ports off 68-69 390/400 HP 427 Corvette Heads have been surfaced just enough to true them up, 3 way valve seat grind, valves ground, hot tanked and magnafluxed, Hardened Exhaust seats installed and ALL new bronze valve guides. Heads are NOT even assembled as of this time.
8) Set of Patriot 2 1/8" fenderwell headers
9) 454 Engine with Hi Perf cast on back of block with forged crank, 10:1 comp ratio. Engine has OPEN Chamber pistons and heads, 427 Heads are Closed Chambers
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Old 04-25-2006, 08:02 PM
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engine

IMO keep #3 and #9

Sell eveything else and get the correct solid roller cam, and make sure that 454 has 781 or 049 oval ports.

That should be a easy 10 sec ride with out spinning it over 6500 rpm... easy on parts.

Keith
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Old 04-25-2006, 08:11 PM
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oval heads are for lower rpm . rectangle heads are for higher rpms so they would be better for the track. they flow a lot more air than the oval
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Old 04-25-2006, 08:16 PM
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Uh you cant use open chamber pistons with closed chamber heads... You can go the other way but not the way you have listed...
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