Crower 300H Camshaft

[davidcam69]

I have a 383 with pop up pistons (suppose to be 11.5 to 1). 15 years ago the engine ran well but had a very mild cam. Pulled cam and lifters and tossed it. Some of the lifters showed some wear. 906 heads are in good shape but nothing special. I've had this cam kit ( springs, lifters, springs) on my shelf for fifty years. Will this cam work at all with this combo. This won't cost me a dime to put together and I don't have a purpose for it. Just for fun and I can fire it up on the floor.
duration 300 both
intake lift .542
exhaust lift ..524
dual valve springs and hyd lifters















   

[John_Kunkel]

Will it "work"? Depends on what you expect it do. If you want a rumpty-rump idle, it'll do that.

[BSB67]

What is the 0.050" duration?

What was the old cam, its short comments, and expectation of the new cam?

[davidcam69]

At .050  intake 233 and exhaust 233 lobe lift- intake .345 and exhaust .345.  The old cam I think was a street hemi grind. It was in a pro street duster I bought 20 years ago.  Had 4400 stall and 4.88 gear. Has some compression because it would detonate easily.   I took it apart and the cam showed some wear. I don't have any expectations, I don't need it. Just wondering if valves are going to hit pistons and if the compression would give this cam any life. Besides the lump would it have anything else going for it. 

[BSB67]

So the "new" cam is 300° advertised duration, but only 233° at 0.050"?

Your lift numbers are conflicting.  Is it 0.542/0.524, or is it 0.518/0.518?

[davidcam69]

According to the information I got off line, lift is .542/.524 and at .050 duration is 233/233.  I copied what looks like a cam card off line. Has complete break down of cam and springs. It says information on advertised specifications are based on rocker arm ratio of 1.57 in and 1.52 ex. 

[BSB67]

Got a picture of the part number?  Not sure why Crower would advertise cam specs for rocker arms that have never existed for a BBM wedge.  Hemi maybe?

[davidcam69]

Pics are a challenge for me.  Part number/work order number 33242. Engine Application 426 Chrysler.

[BSB67]

233° @ 0.050 is not much.  300° is quit a bit for a 383.

I had a 383 w/ the domed piston w/ valve notches.  

My Crower 296° (254° @ 0.050) was close enough that I had to advance the cam to get enough exhaust clearance.

My guess, you'll probably be okay.  I would check though.

[davidcam69]

Ok, thanks. How do you think this engine would perform with a manual trans? 906 heads- Weiand single plane- dp 750 holley. Again just playing, I have everything to put this together. 

[BSB67]

Probably okay.  Consider a dual plane if its a street car.

[c00nhunterjoe]

The performer rpm intake over the weiand with cam advanced. 4.30s or 56s, 29" tire. 1 3/4 headers and 3" pipes. 8" converter if you stick with an auto. Will be a high 11 second car. Manual trans will be fun. Not much low end torque but the gear will make you forget about that.

*** this is all asuming that you have a good dome piston that actually yields 11.5:1 in a 383*** if its apart, might as well get the piston pn and measure where they sit in the hole.

[Challenger340]

if the Cam Card is showing Rocker Arm Ratios of 1.57/1.52 the Cam is for a HEMI.... not a wedge ! and it's NOT going to work in your 383 !

[davidcam69]

    Pistons are right at the top, maybe .005 down. 340 do you mean it won't work account piston to valve clearance or just won't run well?

     Thanks all for your input. 

[alfaitalia]

if the Cam Card is showing Rocker Arm Ratios of 1.57/1.52 the Cam is for a HEMI.... not a wedge ! and it's NOT going to work in your 383 !

He says himself that's its for a 426 (HEMI) in post 7.....

[c00nhunterjoe]

if the Cam Card is showing Rocker Arm Ratios of 1.57/1.52 the Cam is for a HEMI.... not a wedge ! and it's NOT going to work in your 383 !

I took it as he just googled cam cards to try and get lift numbers, not his actual card. But raises enough doubt that it is best to identify what the cam on hand is. Can measure to see if it is a hemi cam on not but i dont recall the front journal difference and length offhand.

Are there any pn on the cam?

[John_Kunkel]

if the Cam Card is showing Rocker Arm Ratios of 1.57/1.52 the Cam is for a HEMI.... not a wedge ! and it's NOT going to work in your 383 !

He says himself that's its for a 426 (HEMI) in post 7.....

Crower #33242 is a Hemi cam. Hemi cams fit perfectly in a Wedge with the proper cam gear but the lobes are different.

https://www.crower.com/camshafts/mopar-426-hemi-66-71-compu-pro-hydraulic-cam-300-hdp.html

[davidcam69]

Markings on the end of camshaft. Crower M300-H.  Then below that   MONARCH with the number 44 stamped on top of MONARCH. Also it is a single bolt hole cam.

    Thanks John. For sure a Hemi cam. Guess I'll scrape that idea.

[c00nhunterjoe]

I thought hemis were all 3 bolt?

[davidcam69]

  That's what I thought. If it was a dedicated Hemi cam it would be a 3 bolt. I've had it so long that I don't remember much about it. Pretty sure I never used it but know that it didn't come out of a Hemi. Its used, but very little. Apparently who ever used it didn't like it. Back in the day if you changed cams in a Hemi you usually stuck with solid lifters.

[c00nhunterjoe]

The grind number is hemi, but ive never claimed to know everything so best to wait for a hemi expert to chime in on that one. Even if it fits, its a bit big for a 383 on the street.

[John_Kunkel]

I thought hemis were all 3 bolt?

The first years, '64-'65 were single-bolt.

[davidcam69]

Did any come with hydraulic lifters?

[John_Kunkel]

'70 and '71 Hemis had hydraulic lifters.

[davidcam69]

With 3 bolt cam?  Maybe mine is a solid cam that somebody decided to run hyd. I really don't think so. What do you think the 44 stamped on cam was for?

[c00nhunterjoe]

The H should be for hydraulic, the usually stamp an S for solid. Perhaps an email with photos to crower is in order.

[John_Kunkel]

With 3 bolt cam?  Maybe mine is a solid cam that somebody decided to run hyd. I really don't think so. What do you think the 44 stamped on cam was for?

This is an aftermarket cam, the maker doesn't have to play by factory rules. It is a single-bolt hydraulic cam for a Hemi...nuff said.

[Nacho-RT74]

if the Cam Card is showing Rocker Arm Ratios of 1.57/1.52 the Cam is for a HEMI.... not a wedge ! and it's NOT going to work in your 383 !

I was to post just that!!!

http://www.crower.com/media/pdf/mopar.pdf

[davidcam69]

   Yep, Crower said it would not run period.  Due to lifter pushrod angel.

    Yes John "nuff said"            Thanks