Engine Can change - valve springs also?

C

Cg’s 347

Member

Jan 15, 2024

12

1

13

CT

Feb 17, 2024

#1

• Feb 17, 2024

• #1

I am tearing apart my motor because I lost oil pressure. While it’s apart I am buying a new cam. My setup is a 347 with edelbrock 60225 heads, Jay Allen custom billet cam, performer rpm 2 intake. I built the motor 20 years ago roughly. I would bet the motor doesn’t have more than 15k miles on it. I want to reuse the heads and intake but I am switching to a comp XE274HR recommended from comp. Trying to decide if I need to change the valve springs. When I built the motor I bought the springs with the cam and I don’t remember the seat pressure but I remember it was high, even the machine asked me if I was sure about it. With that being said should I replace the springs or use the existing? If the springs are too heavy could I damage the cam? Thanks!

 

limp

wrap a little cheese around it and its a done

5 Year Member

Oct 4, 2020

5,466

2,899

173

Florida

Feb 17, 2024

#2

• Feb 17, 2024

• #2

Did you figure out the cause of the oil pressure loss?

 

C

Cg’s 347

Member

Jan 15, 2024

12

1

13

CT

Feb 17, 2024

#3

• Feb 17, 2024

• #3

Not yet, need to drop the pan and investigate further probably replace the oil pump. But I want to order parts now.

 

Bullitt347

I have been doing it wrong this whole time

15 Year Member

Mar 23, 2007

3,962

2,922

194

Middle of Maine

Feb 17, 2024

#4

• Feb 17, 2024

• #4

Use the springs Comp Cams recommend for their camshaft.
That way there is no question if they are right or not.

 

Reactions: slow84lx, Monkeybutt2000 and JD1964

AeroCoupe

lube between the nut and the face. I know my lubes

Founding Member

Oct 28, 2001

5,870

3,992

183

Claremore, OK

Feb 17, 2024

#5

• Feb 17, 2024

• #5

Or use the ones your engine builder recommends. I trust my engine builder a lot more than Comp but he is also the guy machining, porting, and assembling so not you average gas station slap it together and pray guy.

 

C

Cg’s 347

Member

Jan 15, 2024

12

1

13

CT

Feb 17, 2024

#6

• Feb 17, 2024

• #6

I couldn’t find a recommendation anywhere from Comp for that cam. I was thinking comp cams springs 26925. Seat pressure is 141 and open pressure is 413. I was hoping someone would say the springs I had were fine and I wouldn’t have to take the heads off but I don’t think that’s going to happen!

Comp Cams Dual Valve Spring Kit 26925-KA

Comp Cams Dual Valve Spring Kit 26925-KA

flowtechinduction.com

 

AeroCoupe

lube between the nut and the face. I know my lubes

Founding Member

Oct 28, 2001

5,870

3,992

183

Claremore, OK

Feb 17, 2024

#7

• Feb 17, 2024

• #7

Believe the springs would be 987-16 do some digging.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,249

17,934

224

Massachusetts

Feb 17, 2024

#8

• Feb 17, 2024

• #8

Did the cam grinder recommend new springs?

When I got my custom grind from FTI there was a couple spring recommendations in terms of seat pressure. I did end up changing out the springs on my TFS170 heads to what was recommended.

 

Kid wita 5oh

I'm definitely not in the original hole

Founding Member

Nov 5, 2000

1,406

149

93

Saugus, MA

Feb 18, 2024

#9

• Feb 18, 2024

• #9

I'm running the xe274hr in my 347 with standard tw170s... An older set at that... I used the springs that came on the heads from TFS. Now I don't know if they are similar rates to the ones on your Edelbrock heads but I had no signs of valve float on the Dyno this past fall

 

2000xp8

SN Certified Technician

Aug 8, 2003

8,024

1,616

194

NJ

Feb 18, 2024

#10

• Feb 18, 2024

• #10

I'd have the heads reworked and let the shop that does the work decide what springs to use based on the cam.
You are pulling apart the engine already, might as well get some power of out all this time and money.
Based on your part numbers they are edelbrock performer rpms, which were pretty good back in the day for a 302, but they would be undersized for a 347.
You already have the performer RPMII intake, so might as well make the best of it.

All heads should goto the machine shop when an engine is rebuilt for at least a valve job.

 

Reactions: General karthief

T

Tlutz27

New Member

Feb 22, 2024

2

1

1

USA

Feb 22, 2024

#11

• Feb 22, 2024

• #11

2000xp8 said:

I'd have the heads reworked and let the shop that does the work decide what springs to use based on the cam.
You are pulling apart the engine already, might as well get some power of out all this time and money.
Based on your part numbers they are edelbrock performer rpms, which were pretty good back in the day for a 302, but they would be undersized for a 347.
You already have the performer RPMII intake, so might as well make the best of it.

All heads should goto the machine shop when an engine is rebuilt for at least a valve job.

Click to expand...

Can you please pm me.

 

2000xp8

SN Certified Technician

Aug 8, 2003

8,024

1,616

194

NJ

Feb 22, 2024

#12

• Feb 22, 2024

• #12

Tlutz27 said:

Can you please pm me.

Click to expand...

Sure, but just so you know, i'm married (to a woman). J/K.

If you are going to ask about the heads, me personally i'd probably Call TEA (total engineering airflow) and see if they have a cnc program for that set, they do other edelbrocks so...

 

Reactions: Noobz347 and General karthief