402, 408, 427 guys, come on in!!
Originally Posted by WKMCD
403 L92/L76 very mild build. 11.3:1 compression. WCCH Stage 2 L92's, Baby cam 234-240. Drive likes stock and makes 501/467 with 380 RWT at 2200RPM.
TECH Resident
Joined: Jan 2003
Posts: 855
Likes: 0
From: AUSTIN TX
Originally Posted by SS101
nicely done guys...i like the numbers but everybody seems to be running such high compression
i'm planning on about 10:1ish with my build so i hope i can at least squeeze out something close to what you guys are putting down.
i'm planning on about 10:1ish with my build so i hope i can at least squeeze out something close to what you guys are putting down.
well i'm planning on twin turbos and nitrous in the future, just can't come by the money right now 
. i'm pretty much a dope when it comes to cams...the numbers may as well be in chinese, but i asked around before and got these numbers from predator-Z
243/249 .629/.629 112+2 Lsa
i said i needed a good idle, plenty of power under the curve (road racing) and a high redline @ or around 7K. like i said, i don't know jack about cams, but i DO know that predator-Z is the man when it comes to cams.
. i'm pretty much a dope when it comes to cams...the numbers may as well be in chinese, but i asked around before and got these numbers from predator-Z243/249 .629/.629 112+2 Lsa
i said i needed a good idle, plenty of power under the curve (road racing) and a high redline @ or around 7K. like i said, i don't know jack about cams, but i DO know that predator-Z is the man when it comes to cams.
12 Second Club
Joined: Mar 2006
Posts: 302
Likes: 1
From: Sarasota, FL
Originally Posted by SS101
nicely done guys...i like the numbers but everybody seems to be running such high compression
i'm planning on about 10:1ish with my build so i hope i can at least squeeze out something close to what you guys are putting down.
i'm planning on about 10:1ish with my build so i hope i can at least squeeze out something close to what you guys are putting down.
you could build it pretty high compression for the time being with a set of 59cc heads and later down the road you could swap out the 59 cc heads for a set with 72cc chambers when you go fi.
two motors in the works:
434 stroker, ported ls7s, 13.5:1 compression, 259-268 .658"int/ext 110lsa+0 custom grind comp. numbers soon.
this motor is already completed just not in the car.
438 stroker, World product ls7x warhawk heads, 11.5:1 compression, 242-248 on 112+4, numbers soon as well
434 stroker, ported ls7s, 13.5:1 compression, 259-268 .658"int/ext 110lsa+0 custom grind comp. numbers soon.
this motor is already completed just not in the car.
438 stroker, World product ls7x warhawk heads, 11.5:1 compression, 242-248 on 112+4, numbers soon as well
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote that's a good idea gannet...i might just do that
do you think it would make enough ower to justify the cost of another set of heads tho? if we're talking ten of horsepower then i may just take the hit in the wallet
do you think it would make enough ower to justify the cost of another set of heads tho? if we're talking ten of horsepower then i may just take the hit in the wallet
Two recent 403/408 builds that we have completed.
403/L92 cnc heads, Pat G. cam with about 12.5 compression 544/498 through 28 in hoosier QTP's
408/L92 cnc heads TSP cam 12.75 compression 529/490 through a 12 bolt and 27 in et streets.
Both M6 cars, both running out of fuel.
Did another 403 not long ago in a 06 C6 vert, also m6 had out of the box l92's with a TSP giant on a 114 and 10-1 compression, and it did 501/478 through 1 7/8 lt's and corsa exhaust.
Also an auto 02 z28 with an slp shortblock, and out of the box l92's with a TSP giant on a 112 and a 9 in rear with a 3600 converter- 477/458 unlocked.
403/L92 cnc heads, Pat G. cam with about 12.5 compression 544/498 through 28 in hoosier QTP's
408/L92 cnc heads TSP cam 12.75 compression 529/490 through a 12 bolt and 27 in et streets.
Both M6 cars, both running out of fuel.
Did another 403 not long ago in a 06 C6 vert, also m6 had out of the box l92's with a TSP giant on a 114 and 10-1 compression, and it did 501/478 through 1 7/8 lt's and corsa exhaust.
Also an auto 02 z28 with an slp shortblock, and out of the box l92's with a TSP giant on a 112 and a 9 in rear with a 3600 converter- 477/458 unlocked.
TECH Resident
Joined: Jan 2003
Posts: 855
Likes: 0
From: AUSTIN TX
Originally Posted by slow trap
you could build it pretty high compression for the time being with a set of 59cc heads and later down the road you could swap out the 59 cc heads for a set with 72cc chambers when you go fi.
Originally Posted by the_merv
You get a bigger Cam in there, and it will be a monster. That setup is very similar to mine, and mine has some crazy power at low RPM's as well..I have a bigger Cam..hopefully it puts down some nice numbers..
Originally Posted by brokeTA
403/L92 cnc heads, Pat G. cam with about 12.5 compression 544/498 through 28 in hoosier QTP's
408/L92 cnc heads TSP cam 12.75 compression 529/490 through a 12 bolt and 27 in et streets.
Both M6 cars, both running out of fuel.
408/L92 cnc heads TSP cam 12.75 compression 529/490 through a 12 bolt and 27 in et streets.
Both M6 cars, both running out of fuel.
12 Second Club
Joined: Mar 2006
Posts: 302
Likes: 1
From: Sarasota, FL
Originally Posted by SS101
that's a good idea gannet...i might just do that
do you think it would make enough ower to justify the cost of another set of heads tho? if we're talking ten of horsepower then i may just take the hit in the wallet
do you think it would make enough ower to justify the cost of another set of heads tho? if we're talking ten of horsepower then i may just take the hit in the wallet
Let's assume a 427 with 59cc heads and a SCR of 11.73. Going to 62cc gets you 11.35, and 72cc yields 10.25. So you can move it a point to a point and a half with a head change. From an economic point of view, if you buy quality heads that are well-regarded, such as AFRs, then you should be able to sell them for 75-80% of what you paid for them.
Just to clarify:
I believe when people refer to a "point" on compression, they are referring to a movement of a whole number. As in 1 point is the difference in 11.0:1 and 12.0:1.
I believe when people refer to a "point" on compression, they are referring to a movement of a whole number. As in 1 point is the difference in 11.0:1 and 12.0:1.
