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72 351HO
#1
Was wondering if anyone has personal experiernce with the 351HO engine? I'm considering that cam for a build i'd like to do. Don't hear much about that one, mostly the Boss 351(haven't rulled that one out either) Guess I'm concerned about the smog police and keeping close to stock.....thanks jim
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#2
jim,
no smog police before 75 in CA. don't worry. but that said companies like Comp Cams make good choices. more people will reply.
Jenny
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#3
jennyrn95630@yahoo.com;106469 Wrote:jim,
no smog police before 75 in CA. don't worry. but that said companies like Comp Cams make good choices. more people will reply.
Jenny

I got a letter in the mail a while back said their smog sensors in San Jose detected my car was smoking and if I get caught a certain number of time I'd have to take it in for inspection. It does not smoke, use or burn oil what so ever. So I stay the hell away form San Jose. Anyone else get one of these?
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#4
jims72;106474 Wrote:
jennyrn95630@yahoo.com;106469 Wrote:jim,
no smog police before 75 in CA. don't worry. but that said companies like Comp Cams make good choices. more people will reply.
Jenny

I got a letter in the mail a while back said their smog sensors in San Jose detected my car was smoking and if I get caught a certain number of time I'd have to take it in for inspection. It does not smoke, use or burn oil what so ever. So I stay the hell away form San Jose. Anyone else get one of these?

Wow...that is messed up {shakes head}...My Rich aunt lives there....And it is the riches town in America.....I will defenatly stay away from there...They do not like our old cars in such towns...Not welcome unless it is some super star driving it. Wink Im sure some one was driving along and turned you in just cause they didn't like your classic.
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#5
I owned a Boss 351 and a 351 HO Waaaaayyy back in the day. Both had solid flat tappet cams from the factory. The HO cam had a bit less intake duration, a bit more exhaust duration, little more lift, and less overlap. A lot of progress has been made in camshaft design since 1972. I'd suggest using a modern design cam. Do you want to use solid lifters or hydraulic?
Chuck
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#6
c9zx;106478 Wrote:I owned a Boss 351 and a 351 HO Waaaaayyy back in the day. Both had solid flat tappet cams from the factory. The HO cam had a bit less intake duration, a bit more exhaust duration, little more lift, and less overlap. A lot of progress has been made in camshaft design since 1972. I'd suggest using a modern design cam. Do you want to use solid lifters or hydraulic?
Chuck

Yah, I'd like to go solid if I can keep the lift near or very low half inch area and overlap around 46* or lower.
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#7
I don't know what CR or gears you plan on. You might look at something like this http://schneidercams.com/264-74F_351Csolid.aspx Finding a good selection solid flat tappet street/strip cams has become difficult. Schneider will do a "quasi-custom" cam for just a few dollars more. Most of the "big" cam companies only offer one or two. I assume you are going to use pump premium. You need to do a sanity check on effective compression ratio before making a cam choice. Detonation is a terrible thing. Chuck
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#8
I live in SoCal. Working in the traffic industry I was aware of those machines.

In a period of 9 months, I got three notices from the sniffer, and 2 notices because someone reported me.

I also got a finger from an old broad who was stuck behind me at a light.

I enjoyed receiving them all. And the warning don't mean jack....but if they do please let us know.

jims72;106448 Wrote:Was wondering if anyone has personal experiernce with the 351HO engine? I'm considering that cam for a build i'd like to do. Don't hear much about that one, mostly the Boss 351(haven't rulled that one out either) Guess I'm concerned about the smog police and keeping close to stock.....thanks jim

Also, most cam companies do have grinds that match OEM specs. I know a lot of guys puke at the thought of putting an OEM spec'd cam into our motors, but that is what I did.

I have an Isky 351 Boss cam spec, albeit for hydraulic lifters....though that is probably a mistake on my account as I don't have the torque converter or rear end to wind it up...yet. But I do have the closed chambers.

I would investigate building your motor to 1971 specs as 72 and 73 had way more compromises for smog/power. I have a 1971 Service Manual for the motors and can provide whatever info you need. eBay has them occasionally as well $15-20.

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351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
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#9
jims72;106474 Wrote:
jennyrn95630@yahoo.com;106469 Wrote:jim,
no smog police before 75 in CA. don't worry. but that said companies like Comp Cams make good choices. more people will reply.
Jenny

I got a letter in the mail a while back said their smog sensors in San Jose detected my car was smoking and if I get caught a certain number of time I'd have to take it in for inspection. It does not smoke, use or burn oil what so ever. So I stay the hell away form San Jose. Anyone else get one of these?
WHAT! You must be kidding.Angry Oh yeah that's rite its flippin California!
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#10
I hear they call them Smog DOGS for obiouse reasons.

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Just cruising along minding our own business when BAM!!! The LAWS show up.
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