Hey guys, I have a BBC 454 with 3931063 heads, and they are oval port, closed chamber. Compession is about 9.7:1 and I'm running an HEI. Do you need the cam specs?

Any recommendations are welcome, I need something quick!

Bump

Cam specs,carb,intake,trany,and gear would be very healpfull.

But if your running a fairly mild cam with lets say 12-15 iches vacuum at idle i would start with AC R44N older # or the newer AC PLUG THAT REPLACED IT PER THE AC DELCO PLUG CTATLOG IS R44XLS(newer design prefered extended tip runs cleaner) in your 063 heads which use the older style long reach plugs. By the way the closed chamber 063 large oval port head is a decnet flowing head sep if some porting is done along with installing larger valves.

The R44XLS is a fairly cold plug so start there and then check the plugs to see if you need to go hotter(R45XLS) or colder(R43XLS) dpending totally on your particular setup.

Autolite 64 or 65 would also be a decent plug to start with.

Dont forget that your fuel calibration/carb setup has an effect on plug readings too so ensure your in the ballpark there too(maybe 70-72 primary & 78-80 secondary if running a holley) before trying the plugs.

Also, ensure you have the correct power valve(Holley) that is matched to your idle vacuum so it doesn't activate/open the power valve at or just off idle due to low intake vacuum resulting in a rich mixture fule fouling your plugs over time.

Lastly,if your running an aftermarket perf cam be sure to run approx 15-18 deg btdc initial timing for a total of approx 36-38 deg btd not including vacuum advance as good startrign point here too. If your running the intial too retarded it will also affect plug readings due to casuing lower idle & low speed intake vacuum that could possibly cause the power valve to open prematurly thus resulting in an over rich fuel mixture so keep that in mind too.

Scott

Hey Scott, thanks for the advise. Well here is more info on the combo just incase I can get a really close spark plug.

Reed Cam spec:

Advertised Duration IN/EX: 282/286
Duration @ .050 IN/EX: 228/232
Gross Valve Lift IN/EX: .544"/.551"
LSA / ICL: 110/106

Motor Specs:

454 bored 30 over
063 oval port heads 95 cc (ported) with 2.19/1.88 valves
*Flow Numbers @ 28": Intake @ .600 325 cfm / Ex @ .600 230 cfm
TRW Flat top pistons 9.7:1 Compression
1.7 Roller Rockers
Weiand 8005 intake (ported to match heads)
Holley 3310 750 CFM
TH350
Posi rear 3.73

Anything else needed?

Ceaser,my domed (.118 height dome?)2240nf .030 over speedpro forged pistons are listed in the speedpro catalog as 9:7 comp with 063 100cc chahmbers so the trw flatops you have will be lower comp like approx 9:0 comp + - which would be marginal compression for almost 230 deg int dur @.05 on 110 deg L/S IMHO.

So check that out .

Take a comp check on motor after cam breakin is done if its a fresh motor of if its not a frech motor take a comp chk on a couple cycls to see where its at. If the flat top pistons have lowerd the comp you will see low static cranking comp like approx 130 or lower .

But plug rec stays the same.

Scott

It's a fresh motor, so I'll so the comp check after the break-in. Thanks for the advise! I'll be buying the R44XLS as you said. Thanks again!

Hey Scott, or anyone, where can I get the R44XLS plug? I've called everyone and they do not have those. Napa was the best help, but they don't have that plug, their system shows 4 plugs with that part #. Also, what's the price on those? Are they rapid fire or platinum?