Ok I got a 77 454 truck motor with flat tops and std bore that came with 781's.. I just recently bought a set of 1965 702 casting heads to raise the compression. My question is I was going to build a 454 with all gm parts I was gonna use the 702 heads closed chambered heads and a 1960's aluminum holley dual plane intake and a 1970 chevelle LS6 reproduction camshaft with solid lifters.. Would this be worth building was wanting something with alot of torque.. The camshaft that I found is suppose to be a recreation of a 1970 chevelle LS6 camshaft here is the link to the camshaft kit has anyone ran this combo?

http://cgi.ebay.com/ebaymotors/Chevy-454-Solid-ultimate-camshaft-kit-LS-6-Chevelle_W0QQcmdZViewItemQQ_trksidZp3286Q2em20Q2el 1116QQitemZ320143278257

that is like totally the wrong cam, almost anything modern would be better.

Your compression is kinda low for it, if you had 10:1 I'd say go for it. It has 6* advance but seat to seat is still pretty long. I would consider the Summit 1302 or 1303, either would work better.

I figure you should be down around 9.2 to 1 CR. so a good old CC 270 Magnum for grunt or their 280 Magnum for more topend will do nicely here.

In fact, the VooDoo 268 will probably be SOTA for you!!

Nothing fancy at all..

Oh, and btw, install stock type .020" thick steel shims!

pdq67

If you insist on GM parts, you can use the 163 high rise rectangular port intake as well. It will work fine and look very stock. We used a Cam Dynamics 272 Energizer cam, headers, and the above intake. The car, 3900 pounds with driver went 102.4 mph with no fine tuning. I believe that calculates to approximately 320 rwhp. Shifting at 5800 the car ran 14.1. Shifting at 5000 it went 13.6s. Slicks would have helped considerably as the car was breaking loose once it was out beyond the traction compound. It wouldn't take much more cam to make 400 at the engine and still have a mild combination that should last forever.

Ok I got a 77 454 truck motor with flat tops and std bore that came with 781's.. I just recently bought a set of 1965 702 casting heads to raise the compression. My question is I was going to build a 454 with all gm parts I was gonna use the 702 heads closed chambered heads and a 1960's aluminum holley dual plane intake and a 1970 chevelle LS6 reproduction camshaft with solid lifters.. Would this be worth building was wanting something with alot of torque.. The camshaft that I found is suppose to be a recreation of a 1970 chevelle LS6 camshaft here is the link to the camshaft kit has anyone ran this combo?

http://cgi.ebay.com/ebaymotors/Chevy-454-Solid-ultimate-camshaft-kit-LS-6-Chevelle_W0QQcmdZViewItemQQ_trksidZp3286Q2em20Q2el 1116QQitemZ320143278257That That would be ok, you can send those 781 heads up to me:D:D

I figure you should be down around 9.2 to 1 CR. so a good old CC 270 Magnum for grunt or their 280 Magnum for more topend will do nicely here.

In fact, the VooDoo 268 will probably be SOTA for you!!

Nothing fancy at all..

Oh, and btw, install stock type .020" thick steel shims!

pdq67

What is the deal with the shims? If I had head work done to the 702's where do yall think I should start? bowl blend and bigger exhaust valve? and what about the stock valves would they be ok.. I know im gonna need some higher lift springs.. So you take a 9.2:1 compression 454 with the 270 magnum camshaft and well matched intake with a little bit of head work what kinda of numbers would I be looking at? This will be put in a late 70's nova with 3:73's and a 3000 stall and probably a 750 carb. I hope to see 11's with a nice take off thats the goal anyways.. thanks yall:thumbsup:

The thin shims (head gaskets) will give you a few more tenths of compression. Depending on the condition of the heads, you can probably just run them as is. If you're going to put money into them, a three angle vavle job and bowl blend would be pretty good.

I have a very similar engine combo to your future 454 with a Crane 282 Energizer cam in there and I'd recomend this cam highly to you. Don't know the numbers but it's a blast to drive around and it's only $129 for the cam and lifters from Summit (last winter anyway).

With your plans for the 454 I figure you should be good for 425 HP and 500 TQ, or thereabouts.

Check this thread out for some good reading: http://www.chevelles.com/forums/showthread.php?t=180558&highlight=282

Tony,

I have kindasorta the same build too
77 block from a PU with the slightly dished slugs and 68 101cc heads....
I come in around 8.8:1
I too selected the Crane 103072 cam
Will run the venerable Eddy C396-QJ Intake (full size oval ports compared to the Performer 2-O's smaller ports), choice of carbs from the stable......Holley, Eddy, Q-Jet...whatever the engine likes best.
This engine should run like a striped ape up to 5200 rpm
Brad calculated 450 ft lbs torque from 2500 up, 475 ft lbs above 3500 roughly 500 peak ft lbs.

That kinda torque with a well-prepped Nova chassis should easily YARD the front wheels and I think high 11s no issue with prep and slicks. I thnk high 12 for my Elky working to mid 12s by end of next season

Great info guys thanks!! Anybody know where I can order these headgaskets?

Jeg's has the shim head gaskets
Mr Gasket
http://www.jegs.com/p/Mr.+Gasket/746654/10002/-1
.018--.020" compressed thickness

Word of Caution
ENSURE you re-torque the heads after initial cam break-in

FYI,the 1971 LS6 motors that where installed only in 188 Corvettes had 9 to 1 compression and used that cam. And they where still fast :yes:

I ran the Gm version of that cam with flat tops,closed chamber retangle port heads,6 lug t400 torque convertor and a single plane when my velle was a daily driver w/a 4.10 rear.
It would run 12.30's 110.mph thru exhaust in the fall & 12.70's 108mph in summer.