When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Dart block
Ccw crank, H beams
-7 cc valve reliefs
PRC 247 63cc
Martin Smallwood Cam
246 258 637 620 112+2
Out the box MSD
Ewp
1 7/8 headers Full Exhaust
Twin disc
pst driveshaft
3.90 12 bolt
315 r888r
108 degree and 100 percent humidity today
24 degrees total timing 12.8 afr
Final numbers where 577 535
Here's the only graph I took a picture of.
Last edited by raymond mckinney; Mar 20, 2025 at 06:59 AM.
How dare you put cathedral port heads on a 427 and make just as much as most ported ls7 headed and aftermarket cam in a stock bottom engine ls7 lol!! Awesome work! Personally nice to see what you did!
How dare you put cathedral port heads on a 427 and make just as much as most ported ls7 headed and aftermarket cam in a stock bottom engine ls7 lol!! Awesome work! Personally nice to see what you did!
here i fixed it for you “How dare you make put on catherdral port heads on a 427 and make just as much as most stock ls7 headed and aftermarket cam in a stock bottom engine ls7 lol!!”
Nice results, but why is the first dyno chart in SAE and the second one In STD?
Sorry we where comparing to a few shops cathedral port builds on here all stp number's. Gains are the most important to me as many have said the Msd doesn't respond to porting....
583hp 545tq sae
Smallwood has spec'd me another Camshaft to try, so Maybe next month I'll have some results on that.
Nice numbers, any plans to take it to the track before the cam swap?
The car has a full road race style suspension setup, but I guess I could make a hit to see what mph it would do...
Definitely not light either at 3600 pounds.
The car has a full road race style suspension setup, but I guess I could make a hit to see what mph it would do...
Definitely not light either at 3600 pounds.
Sorry we where comparing to a few shops cathedral port builds on here all stp number's. Gains are the most important to me as many have said the Msd doesn't respond to porting....
583hp 545tq sae
Smallwood has spec'd me another Camshaft to try, so Maybe next month I'll have some results on that.
Before you spend more $$$ on a cam, go 2in headers/3.5 collectors. You are at the power level where it makes sense to crossover to a bigger/better header. I would certainly, absolutely, try that first before doing anything.else. Congrats, the combo is rocking!
FYI, and don't get offended-please, but I think your heads are crap and it still made amazing power. I can only imagine a Brodix cathedral or a Mast 295 cathedral on this and the power it would make. I have talked with a guy several years ago who made 2hp per cube on a decent 408 with ET cathedral heads. It's totally possible, you just have to get a touch more serious and you are there. We should meet, I am in South Florida, lmk if you ever come to my area.
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.
427 Catheral port Dyno 
