View Full Version : Cam selection for a 350 w/ 601 heads


ORANGE77
02-10-2007, 11:56:39 AM
I have a chance, when I'm ready to buy a set of 601's that had the intakes enlarged to take 1.94 valves. The exhaust stays at 1.5. They were enlarged using a bowl hog and the comb. chambers are at 55cc. This will be on my LM-1 350 w/ its stock pistons, no block decking. Most likely using a .028 GM gasket. Not sure on the rockers and push rods yet. I was thinking of a good non-roller timing chain. Motor has under 36K. I have full length 1 5/8" headers and will be using a 2 1/2" exhaust with X-Pipe. Trans. is a TH-350, stock converter and 342.1 gears. What would be a nice street performance cam combo to match the compression I would be looking at. Upping on the convertor stall would be considered also. :bowtie:

rustbucket79
02-10-2007, 12:03:51 PM
While I personally hate installing 305 heads on a 350, the Comp extreme energy 262H hydraulic cam or equivalent from other manufacturers will work well for you, and even better with a 2500 stall. Do yourself a favor and put a nice radius on the combustion chamber edges that fall inside the head gasket to reduce the chance of detonation.

pdq67
02-10-2007, 12:29:20 PM
Ditto!!

"Do yourself a favor and put a nice radius on the combustion chamber edges that fall inside the head gasket to reduce the chance of detonation."

pdq67

CWT Racin'
02-10-2007, 01:06:02 PM
maybe run the hyd 327/350 hp camsahft.

ORANGE77
02-10-2007, 02:18:34 PM
To rustbucket and/or pdq67. Are you talking about putting a chaffer or rounding off the edge. how would this be done. Where am I going wrong to risk detonation problems. I was thinking the chamber design would be less likely to do this vs a 416 or other 'D' chamber heads. Would a vortec design be my best bet.:)

pdq67
02-10-2007, 03:04:05 PM
You just put an about 1/16" to an 1/8" quarter-round "bullnose" around the sharp edge of the as-cast chamber outline is all to help open it up some as well as to remove any sharp edges that can become hot spots..

It's easy to do, but will take a bit of time.

pdq67

rustbucket79
02-10-2007, 06:22:41 PM
To rustbucket and/or pdq67. Are you talking about putting a chaffer or rounding off the edge. how would this be done. Where am I going wrong to risk detonation problems. I was thinking the chamber design would be less likely to do this vs a 416 or other 'D' chamber heads. Would a vortec design be my best bet.:)

The vortec heads would be your best bet, but yes a nice rounded edge is your best bet.

GM cams, although functional and long lasting, tend to be somewhat lazy on the bottom end of the torque scale, and the 327/350HP grind is too large. (222@.050)

CWT Racin'
02-10-2007, 08:54:59 PM
Rusty, I ran that combo awhile ago, My father put the cam in my motor, and I ran it for years, it pull to 5600 rpms and run mid 13's with 3.23 gear. For being 16 at the time I thought ran pretty good for street, but I agree vortecs are a better choice over any 305 head, just really don't like the idea of coughing up more money for a intake and the centerbolt V/C.

ORANGE77
02-10-2007, 09:29:46 PM
You just put an about 1/16" to an 1/8" quarter-round "bullnose" around the sharp edge of the as-cast chamber outline is all to help open it up some as well as to remove any sharp edges that can become hot spots..

It's easy to do, but will take a bit of time.

pdq67

What do I need tool wise to do this. I could get who I could be buying these from to do this too. Have not ruled out Dart I.E. 180's or Vortecs yet. Just looking at cost. These heads are 375/pair plus shipping. I have a edelbrock eps intake with a squarebore base and a performer square/spread base on the motor now. I was thinking of a cam w/ say 214 on the intake and 224 on the exhaust range. :)

rustbucket79
02-11-2007, 02:25:12 AM
What do I need tool wise to do this. I could get who I could be buying these from to do this too. Have not ruled out Dart I.E. 180's or Vortecs yet. Just looking at cost. These heads are 375/pair plus shipping. I have a edelbrock eps intake with a squarebore base and a performer square/spread base on the motor now. I was thinking of a cam w/ say 214 on the intake and 224 on the exhaust range. :)

Since you already have an intake for the old style heads you should consider the Dart heads. There are a dozen manufacturers out there that make the cam you're thinking of, find the best deal and buy it. 214/224, .443/.465, 112 L/S.

Cardinal
02-11-2007, 02:39:19 AM
Look at Canfield heads too. They have a good price and have good quality too.

I'm not sold on Vortec heads as my inventory is all non-Votrec inakes. It just doesn't make economic sense for me to invest in Vortec stuff yet.

Air_Adam
02-11-2007, 02:52:16 AM
Use a cam with more exhaust duration than intake duration, because the factory heads need the help on the exhaust side if they haven't been ported. My XE274 works great with those heads (230/236).

pdq67
02-11-2007, 02:54:48 AM
And even Hotrodsusa's cheap aluminum and cast-iron heads too.

http://www.hotrodsusa.com/

pdq67

ORANGE77
02-11-2007, 09:20:35 AM
And even Hotrodsusa's cheap aluminum and cast-iron heads too.

http://www.hotrodsusa.com/

pdq67
I've seen their "Superflow" heads on ebay. Could not find anything on cast iron heads though.

ORANGE77
02-11-2007, 10:12:16 AM
As I was looking for cylinder head info., I came accross www.purplesagetradingpost.com. I was linked to "sbc cylinder head info. I've seen this site a few times before, could be from reading other post from our site. The flows they list for Iron Eagle 180's and the L-31 Vortec head at .400 looks great. Look at a SR Tourqer head and it's not worth changing my 882's for those, IMO. Did not find anything on the 601 head bowl hogged for 1.94 intake valves. This is a 160cc head w/ 55cc chambers in stock form if I got my facts straight. I'll be up in the 10's on my compression and would that more problems with my stock pistons and dentination? Going back to that flow chart, then I should keep my cams peak under .500 correct? :)

pdq67
02-11-2007, 12:45:06 PM
Please take a bit of time and read AMOTION's site to learn a bit about lift and valve sizes!!

http://www.amotion.com/

It is well worth wading through it to me!!

pdq67

ORANGE77
02-11-2007, 02:12:31 PM
Interesting piece of reading pdq. I'll read it again later. :bowtie:

Peter Groome
02-13-2007, 03:05:55 PM
I ran a crane energizer h272 with 601 heads which were gasflowed. Produced a lovely thumpy motor which was a great improvement on the old smog heads.
In my opinion it was an excellent combination and really woke up the motor.

pdq67
02-14-2007, 08:55:04 PM
I'm sorry, I used my old 1/4" B&D hand-drill and some cheap 1/4" shank, Chinese stones to do this !!

Just go easy, it won't take long...

pdq67