The original compression ration in 1972 was 8.5:1. The motor is a 1976 block with 1972 heads on it. This was an original block with heads/cam/intake/carb/headers added to it. It also spun a rod bearing on my second pass.
Since this wasn't a 70, it was at full compression for its year. After the rebuild, it's around 9.6:1. To get it higher would have required more machine work to the deck surface, taken from the heads, or a complete change of piston. To get another .5 of a point wouldn't have been worth the extra cost to do so and wouldn't provide much return on the investment. If I were going to go with a lot more cam, it would have been a good idea, but not for the one I eventually ended up using.
i have a crower cam in my 1970 455.its only 464-488 lift with 214-218 @ 050.but it ran a 13.10 12.95 with 350 turbo no stall and factory 2.28 open rear end and 245-60 14 street tires.had to baby it bad for 250 feet.but mph in quarter was 115.pull like a freight train.this cam would be awesome for 8.5 comp.street drive quiet sleeper.
Did you honestly get that kind of a track time with such a cam and rear end thats crazy.
I just bought a Lunati streetmaster for my olds 350 but im thinking of buying a 70 455 it's inexcellent running condition i'll of course change the oil pump, and have the heads rebuilt. The cam has a lobe seperation of 110
at what RPM is that idling? What is your timing at idle, converter, compression, and how advanced is the cam? I'm thinking about using this in a 430 and was wondering how you got it to idle so low and sound so good. Any track time?
I ended up over-revving it and spinning abearing. It now has a bigger cam. It pulled something like 13 or 14 inches of vacuum and idled around 800. I installed it 6* advanced, but I didn't degree it. The recording isn't very good either. It made two passes, although the car wasn't finished. It went 13.50 at 106 mph in 2nd gear. It still had the original 2.56 geared open rear with DOT drag tires on it. The stall was around 2600 with this setup.
I don't know the timing at idle, but it was all in pretty early somewhere in the neighborhood of 34* total. The cam is actually designed to work well with superchargers or turbochargers, but I liked it for the wide separation because it only had about 8.5:1 compression. I ran it with a Holley 850 double pumper. It also had really good iron Stage 1 heads on it. With the right gears I would have expected very low 12's at least, and around 110 mph.
Too bad about spinning a bearing, but it's typical with the bad oiling system on these motors, as I'm sure you know.
Actually, narrower lobe centers are better for lower compression motors because they increase dynamic compression and cylinder pressure. Of course, you end up with a narrower power band in exchange, so it's a trade off. I'm still debating whether to go with something a little more radical, but your ETs say a lot about the potential of that cam.
Cool!! Its good to see a nice original car. Who's is the white GS in the background? Get it on YOUTUBE! Shame you did'nt do a walk around video of your Buick.
Very nice!
cybervore 1 year ago
u should raise the compression ratio to original 10.25:1
tadeh3 3 years ago
The original compression ration in 1972 was 8.5:1. The motor is a 1976 block with 1972 heads on it. This was an original block with heads/cam/intake/carb/headers added to it. It also spun a rod bearing on my second pass.
AGuyNamedSteve 3 years ago
i was talkin about original compression ratio in 1970 when it was at full power
tadeh3 3 years ago
Ok, gotcha.
Since this wasn't a 70, it was at full compression for its year. After the rebuild, it's around 9.6:1. To get it higher would have required more machine work to the deck surface, taken from the heads, or a complete change of piston. To get another .5 of a point wouldn't have been worth the extra cost to do so and wouldn't provide much return on the investment. If I were going to go with a lot more cam, it would have been a good idea, but not for the one I eventually ended up using.
AGuyNamedSteve 3 years ago
thats good, i think i was wrong, for a 455 it was 10 to 1, for a 350 it was 10.25 to 1, anyhoo 1.6 to 1 good, engine sounds great
tadeh3 3 years ago
i have a crower cam in my 1970 455.its only 464-488 lift with 214-218 @ 050.but it ran a 13.10 12.95 with 350 turbo no stall and factory 2.28 open rear end and 245-60 14 street tires.had to baby it bad for 250 feet.but mph in quarter was 115.pull like a freight train.this cam would be awesome for 8.5 comp.street drive quiet sleeper.
ratman33333 3 years ago
Did you honestly get that kind of a track time with such a cam and rear end thats crazy.
I just bought a Lunati streetmaster for my olds 350 but im thinking of buying a 70 455 it's inexcellent running condition i'll of course change the oil pump, and have the heads rebuilt. The cam has a lobe seperation of 110
Duration @ .050 (Int/Exh): 217/221
Gross Valve Lift (Int/Exh): .485/.485
LSA/ICL: 110/104
RPM Range: idle-5500
What kind of carb did you have cfm?
lance62 3 years ago
buick sounds good...
gorillacar 3 years ago
I have to ask...
at what RPM is that idling? What is your timing at idle, converter, compression, and how advanced is the cam? I'm thinking about using this in a 430 and was wondering how you got it to idle so low and sound so good. Any track time?
Nice car, and great sound!
stromtrooper32 3 years ago
I ended up over-revving it and spinning abearing. It now has a bigger cam. It pulled something like 13 or 14 inches of vacuum and idled around 800. I installed it 6* advanced, but I didn't degree it. The recording isn't very good either. It made two passes, although the car wasn't finished. It went 13.50 at 106 mph in 2nd gear. It still had the original 2.56 geared open rear with DOT drag tires on it. The stall was around 2600 with this setup.
AGuyNamedSteve 3 years ago
I don't know the timing at idle, but it was all in pretty early somewhere in the neighborhood of 34* total. The cam is actually designed to work well with superchargers or turbochargers, but I liked it for the wide separation because it only had about 8.5:1 compression. I ran it with a Holley 850 double pumper. It also had really good iron Stage 1 heads on it. With the right gears I would have expected very low 12's at least, and around 110 mph.
AGuyNamedSteve 3 years ago
Thanks for the information.
Too bad about spinning a bearing, but it's typical with the bad oiling system on these motors, as I'm sure you know.
Actually, narrower lobe centers are better for lower compression motors because they increase dynamic compression and cylinder pressure. Of course, you end up with a narrower power band in exchange, so it's a trade off. I'm still debating whether to go with something a little more radical, but your ETs say a lot about the potential of that cam.
stromtrooper32 3 years ago
Cool!! Its good to see a nice original car. Who's is the white GS in the background? Get it on YOUTUBE! Shame you did'nt do a walk around video of your Buick.
jasonv8 4 years ago
Good decicion to keep the original steering wheel.
I can't understand those stupid ten inch rallye wheels.. BTW, great sound!
Kitaroija 4 years ago
Cacchio ti potevi sprecare anche D+
alessandrotigre 5 years ago