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Username Post: GM HT 383 Camshaft        (Topic#257004)
mswrem 
Forum Newbie
Posts: 9

Reg: 01-30-11
02-03-11 06:42 PM - Post#2041691    

Anyone out there running an HT 383 Camshaft in a 350 chevy? I'm building a roller cam engine for my 1984 G20 van. I have roller block, Vortec heads and Edlebrock manifold and 1406 carb. These vans are a little on the heavy side and the cam seems like a good choice. Any info or links will be appreciated very much......Ron

Daily driver
city and interstate
g20 cargo van
worn out 350
700r4
3.42 gear

Edited by mswrem on 02-03-11 06:57 PM. Reason for edit: No reason given.

 
gchemist 
Senior Chevytalk Moderator
Posts: 21624
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
02-04-11 08:18 AM - Post#2041885    
    In response to mswrem

Welcome to the site. I moved your question to the performance section. I'm not familiar with the HT 383 camshaft.
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS


 
MikeB 
Senior Member
Posts: 9472
MikeB
Loc: Plano, TX
Reg: 08-28-03
02-04-11 08:37 AM - Post#2041897    
    In response to mswrem

I personally think it would be a great cam for your van. And you can't beat the price. Back when the HT383 was first available, some GMPP dealers were installing aftermarket cams and selling take-out cams cheap. Now that we have the ZZ383, I'd guess fewer people are hopping up the HT.

One thing to keep in mind when looking at GM roller cams -- some do not have a fuel pump lobe. (The HT383 cam does, of course.)
Real Hot Rods have a Clutch!

1955 210 2dr: 327, Brodix IK180 heads, Jones cam, M20, Wilwood front brakes

1982 C-10 SWB pickup, 250 six, 3-speed

My car pictures



 
mswrem 
Forum Newbie
Posts: 9

Reg: 01-30-11
02-04-11 09:51 AM - Post#2041925    
    In response to MikeB

Thanks to the moderator for moving me to the right place and thanks for the info. The van is an ongoing process. I'm 65 and have been out of the engine building thing for several years and need all the help I can get. I know from experience that it takes some power to move heavy vehicles down the road and the cam seems like it might do the trick. I'm also thinking about 3.73 gears to replace the 3.42

Edited by mswrem on 02-04-11 09:53 AM. Reason for edit: No reason given.

 
C10 Sleeper 
Valued Contributor
Posts: 3426
C10 Sleeper
Loc: Redding Ca
Reg: 03-17-09
02-04-11 10:18 AM - Post#2041936    
    In response to mswrem

I think that cam and a gear change will give you more than enough leverage to get your heavy van moving and keep it in a good operating range for the street.
http://photobucket.com/C10Pictures


 
boogie 
Senior Member
Posts: 2126
boogie
Loc: Louisiana
Reg: 07-11-02
02-04-11 06:46 PM - Post#2042110    
    In response to mswrem

It is a great cam for what you are wanting to do. I have used it a few times on simular builds.
'85 GMC C1500 SWB 355 sbc


 
mswrem 
Forum Newbie
Posts: 9

Reg: 01-30-11
02-04-11 07:54 PM - Post#2042144    
    In response to boogie

I'm wondering if the gear change from 3.42 to 3.73 is the right thing to do. It seems like with the 350 that I have now the van seems to work pretty hard in OD on the slightest grade. The vacuum drops down in the red all of the time. It doesn't seem like it cruises easily.

From what I have read the HT 383 with the Vortec heads like a compression ratio around 9 to 1.

Any ideas on a torque converter stall speed.

As I stated before any info or reliable links will be appreciated. thanks guys....Ron

 
boogie 
Senior Member
Posts: 2126
boogie
Loc: Louisiana
Reg: 07-11-02
02-06-11 06:30 AM - Post#2042650    
    In response to mswrem

The 3.42's should be fine. 3.73's would be a little better but the cost might out weigh the slight difference.

Try the Vortec headed 350 with the ramjet cam mentioned first, I think it will serve you well with the 3.42's
'85 GMC C1500 SWB 355 sbc


 
mswrem 
Forum Newbie
Posts: 9

Reg: 01-30-11
02-21-11 03:30 PM - Post#2049982    
    In response to boogie

Have to get an exhaust system on this thing next month for vehicle emission testing. Hooker headers with 2-1/2 collector. Any recommendation on exhaust size the rest of the way back?

 
MikeB 
Senior Member
Posts: 9472
MikeB
Loc: Plano, TX
Reg: 08-28-03
02-24-11 09:27 AM - Post#2051292    
    In response to mswrem

I'd go 2.5" all the way. With crush bends, you'll effectively get the flow of 2.25" pipes, or maybe less.

With the HT383 cam, 3.42 gears, and the low 1st gear in the 700R4 trans, I'd say a stock converter will work fine. But one advertised as 2000 stall would move the car quicker off the line, and since it locks-up, you wouldn't have to worry about slip in top gear at highway speeds.
Real Hot Rods have a Clutch!

1955 210 2dr: 327, Brodix IK180 heads, Jones cam, M20, Wilwood front brakes

1982 C-10 SWB pickup, 250 six, 3-speed

My car pictures



 
mswrem 
Forum Newbie
Posts: 9

Reg: 01-30-11
02-25-11 04:44 PM - Post#2052039    
    In response to MikeB

Thanks, MikeB. Good lookin 55. Had one like it years ago. It was swimming pool green. Been leaning toward 2.5 but looking for input. I have to run converters and I'm researching some decent quiet mufflers for it also. I intend on driving the van the rest of my life. I'm 65 and it suits my purpose to a T for what I do.

 
bored&stroked 
Senior Member
Posts: 629

Reg: 01-03-03
02-27-11 10:41 PM - Post#2053271    
    In response to mswrem

The ht383 cam is only 3 degrees intake and maybe 1 degree exhaust bigger then the stock L31/iron headed LT1 cam. I'd go with the aluminum headed LT1 cam at 201/207@.050.
- - - - - - - - -
78 c10: 11:1 388,M20,5/5" drop.-playtoy
98 gmc sierra: 5/6" drop, 17" eagle alloy's, flowmaster 50 series.-daily driver
06 CBR600F4i- freakin rocket ship


 
64cv 
"6th Year" Silver Supporting Member
Posts: 702
64cv
Reg: 06-05-08
03-01-11 10:02 AM - Post#2053995    
    In response to boogie

I'm thinking about going to this cam too from something with much more overlap.

Would I have to put the vacuum advance canister back on my distributor? What kind of distributor curve would you run with it?

Brad
Life is an optimization problem; make the most of it!

'64 Impala Convertible, Blueprint 383, Tremec TKO 5sp, 4-wheel disc brakes.


 
C10 Sleeper 
Valued Contributor
Posts: 3426
C10 Sleeper
Loc: Redding Ca
Reg: 03-17-09
03-01-11 12:55 PM - Post#2054082    
    In response to 64cv

I dont know why you wouldnt have a vac advance for a street driven vehicle.
http://photobucket.com/C10Pictures


 
MikeB 
Senior Member
Posts: 9472
MikeB
Loc: Plano, TX
Reg: 08-28-03
03-01-11 04:05 PM - Post#2054188    
    In response to mswrem

  • mswrem Said:
Good lookin 55. Had one like it years ago. It was swimming pool green.


I'll bet that was Neptune Green. I had one in high school -- a 210 with green cloth upholstery.
Real Hot Rods have a Clutch!

1955 210 2dr: 327, Brodix IK180 heads, Jones cam, M20, Wilwood front brakes

1982 C-10 SWB pickup, 250 six, 3-speed

My car pictures



 
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