I need expert opinion for a cam selection street 454 with Merlin 269 - Chevelle Tech
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post #1 of 20 (permalink) Old Jul 3rd, 20, 11:45 AM Thread Starter
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I need expert opinion for a cam selection street 454 with Merlin 269

Cams and pushrod lengths confuse me.
My question is, what is the best cam. This is what I have and had done and want to work with:

I am building a 454.
Machine shop over bored.060.
Standard deck height.

My pistons are heavy. new forged TRW -13.80cc .060 over.

Eagle H Beam rods.

Reground -.010 nodular iron cast 039 crank. Magnafluxed Shotpeened flange trued.

I had a set of older Merlin 269 Heads rebuilt.
The older ones have the 2.19/1.88 valves.
New valve grind. Seats re cut 3 angle.
Spring height correctly set.
135lb springs.
These heads have been milled approximately .030.
Combustion Chambers are 113cc not 119
Intake cc at 271 not 269
Flow:
.100 75/65
.200 144/121
.300 213/165
.400 275/202
.500 323/239
.600 352/262
.700 355/274
.800 341/282

I have a Edelbrock dual plane intake. Not the air gap. The regular one.

800cfm Edelbrock carb.


I am going roller hydraulic.
What’s the best cam?
I am not very knowledgeable on valvetrain geometry.
Have my eye on a trickflow cam:

Summit Racing Part Number:
TFS-41302000
Duration at 050 inch Lift:
236 242 hydraulic roller cam
Advertised Duration:
286 292. .600 lift
Lobe Sep. 112

Will this cam handle cut down heads and dome pistons?
How do I know the valves will clear the dome pistons before I buy the cam?
Is it too big?
Just don’t want to buy this cam and be stuck with it if it has too much lift.
Want max power from this combination i already have.

Cams and pushrod lengths confuse me.

Thank you.
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post #2 of 20 (permalink) Old Jul 3rd, 20, 12:21 PM
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Mr Bill
 
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Re: I need expert opinion for a cam selection street 454 with Merlin 2

If you really want an expert opinion then you should pick a camshaft manufacturer and call them and ask. They are the experts.

Unless somebody has the same exact engine, transmission and car combination that you do it will only be a guess. Even if they do have the same combination theirs might not be running as good as it could.

I have been building engines and doing machine work for almost 50 years and when I need a cam I pick up the phone and call the cam supplier I trust and ask them. Has always worked out pretty good for me.
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post #3 of 20 (permalink) Old Jul 3rd, 20, 12:25 PM Thread Starter
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Thanks.
I will call the cam supplier and see what they say.
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post #4 of 20 (permalink) Old Jul 7th, 20, 5:51 AM
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Re: I need expert opinion for a cam selection street 454 with Merlin 2

Your choice inst bad, albeit a bit big.

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post #5 of 20 (permalink) Old Jul 7th, 20, 7:27 AM
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Re: I need expert opinion for a cam selection street 454 with Merlin 2

If that’s the pistons that I think they are, they don’t have much valve relief so keep that in mind (which you already are).

I’d order a shelf cam from summit and check one set of valves and see what you got.

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post #6 of 20 (permalink) Old Jul 7th, 20, 10:10 PM
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Re: I need expert opinion for a cam selection street 454 with Merlin 2

Listen to BillK!!

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post #7 of 20 (permalink) Old Jul 8th, 20, 8:38 AM
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Re: I need expert opinion for a cam selection street 454 with Merlin 2

If you're using power brakes with a vacuum booster, you will need at least 18" of vacuum at idle... Don't let them tell you different..
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post #8 of 20 (permalink) Old Jul 10th, 20, 4:33 PM
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Re: I need expert opinion for a cam selection street 454 with Merlin 2

I've never had a hopped up Chevy engine that had 18" vacuum. usually 13", which works, at least for me.
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post #9 of 20 (permalink) Old Jul 10th, 20, 5:05 PM
 
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Re: I need expert opinion for a cam selection street 454 with Merlin 2

If we can be of help let us know.

Chris Straub
Mfg Performance Parts

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post #10 of 20 (permalink) Old Jul 11th, 20, 3:24 AM
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Re: I need expert opinion for a cam selection street 454 with Merlin 2

Do you know what springs? and height installed? So you dont get into coilbind.
You usually pick a spring after the cam.

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post #11 of 20 (permalink) Old Jul 11th, 20, 11:54 AM
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Re: I need expert opinion for a cam selection street 454 with Merlin 2

What is the part number on the pistons?

Always by the cam, then make sure the springs you have match up to what the cam manufacturer states is needed. I see too far often guys just look at the lift specs, that is only one part of what determines the spring you need. Ramp acceleration rates also determine the pressures required, seat and open.

According to you head flow numbers, a single pattern or very small split will work best. Not the split in the cam you listed. I would not suggest more than [email protected]" intake duration for a Hyd roller for primarily street driving, and with power brakes.

I would have the divider notched in that intake like the performer rpm air gap is.

I would look at the Howard's 123315-10. 280/280, 227/227 @.050", .555"/.555", 110 LSA 106 ICL. 2-5600 rpm, Mild rough idle, hot street, Should have good exhaust, 2500+ stall, and 9.5:1 compression.
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post #12 of 20 (permalink) Old Jul 11th, 20, 3:29 PM
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Re: I need expert opinion for a cam selection street 454 with Merlin 2

Straub has some nice grinds for the big block chevy may wanna give him a ring.
I would not take a recommendation from a kid on the phone who is simply going by a spreadsheet and by all means stay away from the trendy stuff...thumpr, bootlegger, super fast ramp stuff. Not worth it.

Any cam that makes power will sound good so get one that actually works.
If you get some low vacuum toss a cheap vacuum reservoir on. I get about 8" vacuum on a good day and with a reservoir stops power brakes real well.
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post #13 of 20 (permalink) Old Jul 11th, 20, 4:28 PM
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Re: I need expert opinion for a cam selection street 454 with Merlin 2

Quote:
Originally Posted by MisterMicroscope View Post


I had a set of older Merlin 269 Heads rebuilt.
The older ones have the 2.19/1.88 valves.
New valve grind. Seats re cut 3 angle.
Spring height correctly set.
135lb springs.
These heads have been milled approximately .030.
Combustion Chambers are 113cc not 119
Intake cc at 271 not 269
Flow:
.100 75/65
.200 144/121
.300 213/165
.400 275/202
.500 323/239
.600 352/262
.700 355/274
.800 341/282


Thank you.
The flow numbers you list is this for an out of the box heads? Or have they been tuned up a little? If so what kind of work was done. I've always wanted to try a set of those heavy Merlins on a 496 build.

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post #14 of 20 (permalink) Old Jul 11th, 20, 8:17 PM Thread Starter
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Hi.
Thank you for the great info!!!!!!!
These are not out of the box.
I bought them used. They seem like they had work done to them previously. They have been cut way down
I cc’d them. Measured 13cc combustion chamber and 271 intake runners. Higher than out of the box.
The newer Merlin iron heads have bigger intake valves.
Sent them to my machinist.
He re cut seats, set valve heights, measured spring pressure.
I will keep listening to you guys.
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post #15 of 20 (permalink) Old Jul 12th, 20, 10:26 AM
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Re: I need expert opinion for a cam selection street 454 with Merlin 2

Those are some really good flow numbers on the heads. Cam it right and you should have a really good runner. With the data you have, personally, I'd have an honest discussion with Chris Straub on your desired purpose with the car and let him cut a cam for you. I think it would be money well spent.
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