hey guys i just purchased a 454 to put in my 70 camaro.it is a .030 block,speed pro forged pistons pop up,dart iron eagle square port heads,performer rpm intake,performer rpm cam of unknown specs,holley 750 vacuum secondaries,roller rockers.was out of full size 4wd truck,runs super strong.how will this thing run in my camaro?camaro has 2004r trans and 3.73 gear.my buddy says it should run mid 11.

Go to E-brock's site and look up their BB RPM cam's spec's.

And I figure that your 200 tranny better be up to the task or you will shell it if it isn't built to take big BB power.

They can be built to take it too.

pdq67

You have a stump puller on your hands built for rock crawling or mud bogging so it will not be a high reving engine but instead built to shear axles. It will be a hoot to drive on the street assuming those "pop-up" will let you drive with pump gas. Flat tops in a 454 yield at least 10.25:1, pop-ups and we are talking 11.0:1 or if built to LS-6 specs 12.5:1 which makes for expensive gas prices.

Larger Dave

Flat tops in a 454 yield at least 10.25:1, pop-ups and we are talking 11.0:1 or if built to LS-6 specs 12.5:1 which makes for expensive gas prices.

Larger Dave

Flat Tops in a 454 with an open chamber head usually don't even yield 8-1 compression...
1970 model LS6's used a semi-closed chamber head which raises compression considerable.

Hate to contradict you but many early seventies 454 were equipped as I stated with high compression. If he has one, like many engines before it, that is equipped with closed chamber '65 to '70 heads; because they were cheap and plentiful, then the compression can be outrageous with flat tops.

You can not assume every one is running late model peanut heads with huge open chambers. This engine has been rebuilt with none stock parts (since they don't put pop ups in late model 454 engines). Further most people don't like the peanut head, and swap on older heads with out realizing how much it increases the compression ratio on an engine equipped with dished pistons. Because even with dished pistons the compression ration jumps a point and a half.

A check of the catalogs reveals that no pop-up piston listed is less than 10.5:1 with 118 cc chambers (standard for open chamber even though there are larger and smaller chamber sizes available). And he can not be using a open chamber pop-up piston with a closed chambered head as the piston would hit the head. So any way you figure it he is going to have higher than 9.5:1 compression.


Larger Dave

I had a performer rpm cam and intake on a 454 in a 70 chevelle that ran 12.90's with exhaust manifolds !!!! I believe that cam is rather large for a hydraulic. Should run really well. 11's should be no problem with that combo.

Dave,

I figure I'd need a 90 cc head with -5 cc valve notch 4.31" flat-tops, down in the hole .025" with .020" shim headgaskets to make 10 to 1 CR. in a 467 motor

This is why I keep mouthing about hopefully World Products would make an inexpensive cast-iron, Merlin large oval head with a 90 cc chamber, 290 cc intake ports that would use stock, BB valvetrain stuff!

Talk about a winner for flat-top P/U motors, imho!!

The closest we have now that doesn't cost a pound of flesh are the old heads like the supposed 96.7 to 98 cc -206's and such and E-brock's 100 cc aluminum "rovals"...

I have a set of old -206's just to play with if I ever get around to it????

pdq67

they are square port heads.we ran a desk top dyno and got 575 horses and 630ft lbs.i figure around 500 flat.the ports on these heads are huge.

was $2000 too much to give for this?

Hate to contradict you but many early seventies 454 were equipped as I stated with high compression. If he has one, like many engines before it, that is equipped with closed chamber '65 to '70 heads; because they were cheap and plentiful, then the compression can be outrageous with flat tops.

You can not assume every one is running late model peanut heads with huge open chambers. This engine has been rebuilt with none stock parts (since they don't put pop ups in late model 454 engines). Further most people don't like the peanut head, and swap on older heads with out realizing how much it increases the compression ratio on an engine equipped with dished pistons. Because even with dished pistons the compression ration jumps a point and a half.

A check of the catalogs reveals that no pop-up piston listed is less than 10.5:1 with 118 cc chambers (standard for open chamber even though there are larger and smaller chamber sizes available). And he can not be using a open chamber pop-up piston with a closed chambered head as the piston would hit the head. So any way you figure it he is going to have higher than 9.5:1 compression.


Larger Dave

the 1970 LS6 was the last 454 to have 11.1 compression. In 1971 they went to the open chamber head and lowered the compression down to 9.1 compression. my buddy had a 1971 LS6 from a vette in his 67 camaro that ran very good with a cam change.

As far as pistons go, what catalogs are you looking at because I`ve seen dozens of pistons for the 454 with less than 10.5 and still had domes. If your talking like SRP orJE or Ross then sure, most of them are listed with at least 10.5 compression but I`m pretty sure that SRP sells a low compression 10.25 piston with 119cc open chamber heads.

Actually the open chamber head was released in '68 on truck engines and in '69 on the ZL-1 and L-88. The LS-6 which actually made it into production was 11.0:1 but the still born LS-7 was to be released at 12.5:1. I had one as a service part in '71 using TRW pistons.

Actually the open chamber head was released in '68 on truck engines and in '69 on the ZL-1 and L-88. The LS-6 which actually made it into production was 11.0:1 but the still born LS-7 was to be released at 12.5:1. I had one as a service part in '71 using TRW pistons.


I did`nt say 71 was the first year for the open chamber head. what I said was 70 was the last year for 11.1 compression which had closed chamber heads. The LS6 went to 9.0 compression in 71 and had open chambers. The LS7 was 12.5 but it was a over the counter motor anyway, never made it into a production car fromt he factory. No prodution engines were 11.1 compression after 1970. You could get "crate motors" with 11.1-12.5.1 but none of those motors made it into and production car from the factory. I don`t think you can get 10.25 with flat tops either since the most I`ve seen is 9.5-10 to 1 and that was with early 96cc closed ovals. It doesn`t matter what was available 30 yrs ago, what matters is whats available now and there are plenty of pistons available in several compression ratios, you just have to look for them.

$2000 sounds like a great deal if everything is good. you could`nt duplicate it for that price.

ok guys.the heads are big square port.i got a time slip in a 6000 pound truck and it was 13.5@104mph.in a 6000 pound truck!!!i have over $5800 in receipts.so i think i got a deal.but a big block is heavy.what do i need to put in 70 camaro?

you`ll need headers,front springs, possibly a radiator upgrade, not sure if the frame mounts are different but I know some people have run bigblocks on small block mounts before. Thats pretty decent times for a very heavy truck. should be alot faster in a camaro., if you can get it to hook .

my god buddy i am shaking at the fact i am ready for this.desktop dyno says 575,i say 525 but a solid 500.i have a 400 small block in there right now that is tired.i hope i am not disappointed.

my god buddy i am shaking at the fact i am ready for this.desktop dyno says 575,i say 525 but a solid 500.i have a 400 small block in there right now that is tired.i hope i am not disappointed.


how could you be disappointed? Just make sure the rest of your drivetrain is up to the task of that bbc otherwise it won`t matter what parts are in that motor.

my 2004r is out of my grand national and purpose built.my rear is questionable.10 bolt posi 3.73 richmond gear.i want a 6 speed but dont know how it will fease behind a big block.i like the richmond 5 speeds but i heard they are notchy shifters.i really like the 2004r but i like my lockup converter the most.i am really excited about the big block.i have had plenty of big block power but not this strong.