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
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