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  #1 (permalink)  
Old 03-15-2009, 10:17 AM
chevy551958's Avatar
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It's been a while!

New heart being put together for my 55 4x4 truck. 81 vette 350. Getting rid of the 366 big block that was going to go in it! Will post more when I get going on the motor.

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Old 03-15-2009, 11:10 AM
richard stewart 3rd's Avatar
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Hi,
Good move.
Rich
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Old 03-16-2009, 02:10 PM
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More info....

Yea...I got a really good deal on the 366 and it runs good, but being a tall deck it's quite the project to get accessories to bolt up right to it (plus the fact that the 366 is a BOAT ANCHOR!).

So I have a few questions about this 350 combo I'm screwing together:

1981 Corvette 350
Smog pump and emissions stuff removed
Block: 14010207 (stock)
Heads: 462629 (stock)
Dizzy:
HEI w/ an Accel "Super Coil"
Cam:
Summit "sum-1103" cam
442/465 lift
272*/282*
Intake:
Edelbrock tunnel ram
single 4 bbl. carb
"TR1YX"


I'm not sure if I want to run a 600 Edelbrock carb I have or a Holley 650 I have. Which one would be recommended? How would this combo do? Would it idle decent with the cam and tunnel ram? Exactly how radical is a 272* duration cam? Will it lope at idle? I have a 283 with a 306* duration cam that I really like the sound of...trouble is that it wasn't broken in properly so it wiped out a few lobes.

Thanks!
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Old 03-17-2009, 01:34 PM
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Nobody knows?

Oh well, here's some progress. I've been cleaning it up inside, boy was this baby carboned up!








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Old 03-18-2009, 02:41 AM
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What are your plans for the truck? OffRoad, Crusing, etc..
Unless your running @ WOT thru a Mudpit I'd loose the Tunnel Ram.
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Old 03-18-2009, 01:23 PM
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It will be mostly a daily driver actually...but will be beaten on so it will see WOT. Do you think the tunnel ram will hurt low-end power?
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Old 03-18-2009, 07:13 PM
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Quote:
Originally Posted by chevy551958
It will be mostly a daily driver actually...but will be beaten on so it will see WOT. Do you think the tunnel ram will hurt low-end power?
Yes, & can make carb tuning very difficult. T-Rams are for mid to hi rpm.
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Old 03-18-2009, 09:31 PM
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what's a 55 chevy 4x4 look like?
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Old 03-19-2009, 10:11 AM
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Quote:
Originally Posted by chevy551958
Yea...I got a really good deal on the 366 and it runs good, but being a tall deck it's quite the project to get accessories to bolt up right to it (plus the fact that the 366 is a BOAT ANCHOR!).

So I have a few questions about this 350 combo I'm screwing together:

1981 Corvette 350
Smog pump and emissions stuff removed
Block: 14010207 (stock)
Heads: 462629 (stock)
Dizzy:
HEI w/ an Accel "Super Coil"
Cam:
Summit "sum-1103" cam
442/465 lift
272*/282*
Intake:
Edelbrock tunnel ram
single 4 bbl. carb
"TR1YX"
Unless you want to turn the 350 into a boat anchor, I strongly suggest some changes.

First, the heads. They aren't 629s, they're 624s. No such thing as 629, and the 4 is easily and often mistaken for 9. They are terrible. They not only flow pathetically, but if they aren't cracked now, they will be soon. Any time I get a set of these heads, I give them away to the local tech school for the kids to practice porting, or I cut them in half to show my own classes a cross section of the head. The large 76cc chambers plus dished pistons will give you about 8.0-8.5 compression. Way too low for the great cam you have selected. 64cc heads will put you at about 9.3:1 which is more on target.

Cam is great, keep it. Excellent midrange, good low end torque.

Tunnel ram? Seriously? On a 4x4? There couldn't possibly be a bigger mismatch. Use a Performer. Not even performer RPM. You will be building an engine for a vehicle that needs gobs of torque, and doesn't need anything above 4500-5000, and you want to put an intake on it that doesn't even really start flowing until the 4000-9000 RPM range? That right there will make your engine a boat anchor.

Ditch the 624s and use something that flows well, has 64cc chambers, and can take 9.3:1 on 87 octane... gee, sounds like vortecs to me . They'll even work with the cam's .442/465" lift. Performer intake, then your choice of carbs.
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Old 03-19-2009, 10:19 AM
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Quote:
Originally Posted by chevy551958
I'm not sure if I want to run a 600 Edelbrock carb I have or a Holley 650 I have. Which one would be recommended? How would this combo do? Would it idle decent with the cam and tunnel ram? Exactly how radical is a 272* duration cam? Will it lope at idle? I have a 283 with a 306* duration cam that I really like the sound of...trouble is that it wasn't broken in properly so it wiped out a few lobes.

Thanks!

Use either the 600 or 650. In my opinion, the Holley is the better carb design, but the 600 or 650 cfms will be a wash. Either one will do well.

272* (or 214/224 in this case) is a relatively mild cam. Depending on how you tune the ignition curve you will be able to get it a bit lumpy, or be able to smooth it out based on how much initial timing you use. Using a tunnel ram drastically reduces vacuum signal to the carb. What this does is make it lumpy, but it also means that you'll have trouble idling under 1000, you'll have to run excessively rich mixtures that burn your eyes, your throttle response will suck, low end torque will be very pathetic, and tuning the carb will be very difficult.
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