Yes another low compression super budget 454 - Chevelle Tech
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post #1 of 25 (permalink) Old Feb 13th, 17, 11:35 AM Thread Starter
 
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Yes another low compression super budget 454

I have searched and read nearly every post so I have a pretty good idea about what to do but still like you experts to look it over.

I was given 85 C20 with a 454. The plate tag reads 2010 but even on 7 year old gas with a good battery and a little gas dumped in the carb and after a few tries it started up and ran. It will even idle at about 600 after warmed up a bit holding just over 30 psi oil pressure.


I haven't pulled a valve cover but I assume it is the typical 80s no compression peanut port truck engine.


I plan on a compression check and possibly a leak down but really I am not going to rebuild it so it will be what it will be.

This is kind of an experiment or a "told you so" because another kid was given this engine but decided to go 5.3 instead.

The plan is to pull out the engine, degrease it then add:
erson e120721 296adv / 228 @ .05 intake, 306adv /235 exhaust @ .05 .542 lift 110 lsa
Matching springs,
A new timing chain,
a new M77 with a blue spring
reseal it
use the tuned stock 750 qjet
aftermarket dual plane (probably the 8122 wieand I have on the shelf)

I am going to leave it assembled and show the my LS loving buddy we could have built a good running motor in less time with less money than what he is doing now.

The car will be my heavy 74 chevelle crew cab with a 2500 stall in front of the stock th350 and regearing the rear to add a posi and 3.23 gears on a 295/50/15. The exhaust is a set of hooker comps for the car (2" primarys) and 2.5" exhaust dynomax super turbos.


I actually have a few better parts but this is more along the lines of the now typical 5.3 swap. Buy a greaseball and swap cams then run 9s, all 5.3 swaps run 9s right?


any glaring problems?
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post #2 of 25 (permalink) Old Feb 13th, 17, 1:58 PM
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Kerry
 
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Re: Yes another low compression super budget 454

Put a cam with more duration split.
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post #3 of 25 (permalink) Old Feb 13th, 17, 7:42 PM
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Jeff
 
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Re: Yes another low compression super budget 454

heck go all the way put some closed or even semi open chamber heads to bump compression and put in a solid cam. that will make her run better for sure. might even grab some of those cheap ebay heads with 115cc chambers to let it breath lol.

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post #4 of 25 (permalink) Old Feb 13th, 17, 9:10 PM Thread Starter
 
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Actually I have a solid roller 427 with Brodix heads in my camaro plus a set of 049s I could have redone. This is more of a what can you do with junk and nearly for free. I had a garbage low compression 454 with peanut ports in my old k30 and even with just a 204/214 cam, the 8122 street warrior and a set of headers it ran impressively hard.
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post #5 of 25 (permalink) Old Feb 13th, 17, 9:45 PM
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Re: Yes another low compression super budget 454

The 5.3L will pass more gas stations than the 454 and probably have as much power. I have one in my pick up and have been very impressed. Have a fuel injected 454 in the wagon and it has burned through 5 gallons of gas and has never left the garage.
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post #6 of 25 (permalink) Old Feb 13th, 17, 9:49 PM
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Kev
 
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Re: Yes another low compression super budget 454

This is pretty much what I'm planning with a 454 I picked up. I don't know much about BBC cams so I'm reading. I picked up a clean set of closed chamber (390?) heads and a ratty set of 781s for cheap. The plan is to run it a bit to see if it uses oil, if not clean it up, hydraulic cam, head, intake, new timing chain. The drop it into an early 2nd gen Camaro w/ 4-speed.
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post #7 of 25 (permalink) Old Feb 14th, 17, 4:07 AM
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Re: Yes another low compression super budget 454

Quote:
Originally Posted by Philip View Post
The 5.3L will pass more gas stations than the 454 and probably have as much power. I have one in my pick up and have been very impressed. Have a fuel injected 454 in the wagon and it has burned through 5 gallons of gas and has never left the garage.
Too funny but likely true!
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post #8 of 25 (permalink) Old Feb 14th, 17, 6:13 AM Thread Starter
 
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Though I am not going to dispute that a 5.3 will like be more efficient. There is a huge amount to be gained n most of these smog engines. My 74 Malibu easily picked up 3 mpg by getting the crusing air fuel into the low 16s at low load crusing. Tbi 454s are some of the worst and see huge gains by using a innovative wide bad with a output to fool it into leaning out while cruising. There is a reason I am staying with a q-jet. Otherwise as of now I have 160 in headers and will likely be under $500 for the whole swap. I am doing it to show him we could be shortening tire life by thousands of miles right now instead of looking at a engine on a stand waiting for him to find time to strip and install the harness, install the cam and finally tune it. Besides, I have done a 5.3 swap in my brother's 71 olds, which runs great, and is about as exciting as a root canal.
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post #9 of 25 (permalink) Old Feb 14th, 17, 7:59 AM
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Re: Yes another low compression super budget 454

For minimal cost but a bunch of work.
Being it probably has peanut ports as you assume.
I'd yank the heads off and pocket port the bowels, while changing the head gaskets to steel shims.( if it doesn't have them already.)
Just don't nick the seats and a quick hand lap after and you would be good to go. (Provided the valve job was in decent shape to begin with.)
It would take better advantage of the larger cam your intending.
I would go a little farther with the heads myself, but I can do valve jobs for me for free.

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post #10 of 25 (permalink) Old Feb 14th, 17, 8:33 AM Thread Starter
 
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Re: Yes another low compression super budget 454

I started pulling the engine last night and while standing there working the tranny lines back and forth to get the nuts on the lines to turn freely I was staring at the carb thinking, "85 is way too new to have a hot air choke" and "why is this engine blue". I pulled the carb and the numbers show 1979 so who knows what this engine is. I guess I will get it pulled out and see. Maybe get lucky and it will have a set of 781s, probably not but you never know what kind of mix and match it could be.
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post #11 of 25 (permalink) Old Feb 14th, 17, 10:25 AM
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Durand
 
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Re: Yes another low compression super budget 454

Do the same to the 781's.

65 Pontiac Lemans 468 BBC, t400, 4.10 12bolt

Best 1/4 mile. 11.43 @ 118 mph
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post #12 of 25 (permalink) Old Feb 14th, 17, 1:22 PM
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Re: Yes another low compression super budget 454

228/235* .542" 110
sounds like the old Erson HiFlow II that I have in my 68 Corvette with the intake tamed down a bit

"74 Chevelle crew cab"??? what the heck, a 4-door?
or are you meaning Chevy Crew Cab truck?
if truck, the cam is a tad too big for the grunt you will require.
I'd try to find something with more split as noted earlier in the thread.

.542" lift is pushing it a bit for retainer to guide clearance....check
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post #13 of 25 (permalink) Old Feb 14th, 17, 8:38 PM Thread Starter
 
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It is a 4 door sedan. Crew cab sounds cooler. A term coined by Frieburger
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post #14 of 25 (permalink) Old Feb 14th, 17, 9:35 PM
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Re: Yes another low compression super budget 454

Quote:
Originally Posted by Hillbilly40 View Post
It is a 4 door sedan. Crew cab sounds cooler. A term coined by Frieburger
I like to refer to my wagon as a "Vintage SUV"

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post #15 of 25 (permalink) Old Feb 14th, 17, 11:21 PM Thread Starter
 
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So, I couldn't wait and had to take off a valve cover and also check the suffix code.





So are you all excited?











Are you really ready?







And it has!









236s and the suffix code says 1979 lf-9 or 205hp 336ftlbs. Real screamer.
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