cam opinion needed

[mn65bis]

I have a 454, flat top piston, 1966 closed chambered heads, headers, 5 speed, 3.31 gears, 4100 pound car.

I have had several cams in this engine and another engines with this combination in the past 25 years,
first I had an Ultradyne .515 .515lift .221@.050 .221@.050 112 deg. The motor pulled hard from idle and ran high 11's in a 3500lb 1970 Chevelle 4 speed 4.10 gears open headers.
Second cam, Ultradyne .515 .515 lift .221@.050 .230@.050 112deg. This car ran 107mph in a 69 Chevelle with a 4 speed and 3.73 gears and closed headers.
Third engine with flat tops and closed oval port heads. Comp cam 270 270 .224 .224 @.050. This engine had very impressive low end and mid range power in a heavy 65 Biscayne with a 4 speed, 3.73 gears. No 1/4 mile numbers.
Fourth cam, Lunati VooDoo 60203 .542 .554 .227 .233@.050. This cam had great throttle responce not quite the low end power the 270 comp had but very close hp. It ran 12.80@104.44 in the 65 Biscayne open headers, 4 speed.
Fifth cam, Solid roller 11-692-8 .622 .622 .246 .246@.050. 110 deg This was installed in the Biscayne and was dissapointing.

Question 1... Is this too big of a cam for this old school combination? I ran it with closed headers and never felt it hit a power band at any rpm. The old flat tappet cams with lesser numbers would have given it a run for it's money.

Question 2... I will be assembling a 498 BBC with domed pistons. I am looking for around 10 to 1 compression. I have a set of open chambered 781 heads with the big valves will the 11-692 work better in the 498? Or should I do something else
Thanks

 

[grumpyvette]

I have a 454, flat top piston, 1966 closed chambered heads, headers, 5 speed, 3.31 gears, 4100 pound car.
........

Question 1... Is this too big of a cam for this old school combination? I ran it with closed headers and never felt it hit a power band at any rpm. The old flat tappet cams with lesser numbers would have given it a run for it's money.

without knowing the head flow rates,you used and intake used and exact static compression I can,t make a reasonable & accurate estimate, but if we average most of the closed chamber oval port heads at about 103cc and assume average deck heights and gasket dimensions, your 454 would not run with the larger duration cams because the static compression was in the range of 8.5:1 and dynamic around 6.8:1 with that roller cam, (keep in mind closed chamber heads in 1966 varied from 97cc to 103cc, and the valves were not large enought to feed the cylinders at high rpms )

Question 2... I will be assembling a 498 BBC with domed pistons. I am looking for around 10 to 1 compression. I have a set of open chambered 781 heads with the big valves will the 11-692 work better in the 498? Or should I do something else
Thanks

if you get the compression up around 10.0-10.2:1 in that 498 that 11-692 cam should work well, as the higher static compression and larger displacement will bring the cam into its effective operational power band, with mildly reworked 781 heads with big valves

you might want to read this

http://maliburacing.com/patrick_budd_article.htm