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.
FYI
In case you haven't ever seen anything like this.
Saw these at my buddies race car shop.
This is what kind of intake ports it takes to make 750HP on a small block at 8000rpm
Huge ports, smooth curves, almost straight port walls
Tiny Kidney shaped chambers
Even had to add some epoxy back in a few spots to correct smooth wall shape
Pushrod holes ground thru, copper tubes inserted, and epoxied in
Pretty severe porting, and good heads to start with
Dimples for intake gasket retention at the common leak points
9 sec SBC
Agree with the above, but these are far from stock.
IIRC they were Brodix heads.
IIRC they were never flowed on a bench, but done by a guy that has flowed many, and they performed at the track.
Those Brodix heads mentioned, at 382/258 cfm, should support ~550HP or so.
This engine is significantly stronger than that, by like 36%. So we can assume the flow is also.
I would assume the exhausts are well up in the 300s, the intakes in the 400s.
750 HP is some serious poop for a SBC, even a 427 one.
Hence the pics.
MPH is ~150mph ish
ET low 9s or so.
~2700 lbs
Nascar motors are not much higher, and they are now LS.
Last edited by leigh1322; Sep 25, 2024 at 11:54 PM.
Some of this stuff gets real extreme. Some great examples above.
Years ago we rebuilt a 700+HP 302 SBC that had Brodix cylinder heads, but they had been cut apart laterally, like the pic above, and the ports were 1" taller than before.
Huge amount of work had been done to that one before we got our hands on it.
Custom sheet metal dominator intake, etc. 16:1 etc
Very interesting 11,000 rpm engine!
2500 rpm idle.
Sorry too long ago, no pics.
I helped build it and heard it run tho.
Sounded like a BB!
Agree with the above, but these are far from stock.
IIRC they were Brodix heads.
IIRC they were never flowed on a bench, but done by a guy that has flowed many, and they performed at the track.
Those Brodix heads mentioned, at 382/258 cfm, should support ~550HP or so.
This engine is significantly stronger than that, by like 36%. So we can assume the flow is also.
I would assume the exhausts are well up in the 300s, the intakes in the 400s.
750 HP is some serious poop for a SBC, even a 427 one.
Hence the pics.
MPH is ~150mph ish
ET low 9s or so.
~2700 lbs
Nascar motors are not much higher, and they are now LS.
Oh, no……. Those Brodix 13 degree heads will support well over 800 hp NA. Below is an example, not Brodix but similar CFM. But I was just givin’ ya a hard time… 👍🏼
Take a good look at the Wally Booth heads at the bottom of the port.
Epoxied and Raised ports near an inch.
And just a little bit wider than the original epoxy shadow profile LOL!
Some of these guys just do insane work!
But rather than just random internet pics, which ones have you seen/touched/run/built etc?
Last edited by leigh1322; Sep 26, 2024 at 08:04 PM.
Stage II maybe?
I heard they made a couple of those.
My best friend built a 400 Ram Air V with over the counter race parts in 73-74
Shut down Hemis with that one!
For a while....oops.
But I never got to ride in it file pic
Last edited by leigh1322; Sep 26, 2024 at 09:14 PM.
I wish I'd taken pics of the Batten Olds heads I had,( nearly 20 yrs ago), that had been ported by Dave Jacks. They were the size of the Wally Booth heads and flow was somewhere around 370+ cfm (?), I couldn't justify all the custom and high-end equipment they would've needed so they were sold.
Massive ports, but not the size of those Buick heads above.
1970's tech, but they still dominate the fastests Olds race engines to this day!
These are LS heads but the chamber design is by Darrin Morgan for Warren Johnson Pro Stocker , for Warren it helped turn the short turn air , not sure why these guys are using it but could be the same reason
I wish I took better pics and had some of how much I had to remove from the ports for the intake but I did a LOT of porting on my $300 ebay/enforcer style castings as well as to the assault intake to match. being it was my first attempt at porting it came out prety good but ive picked up a few tips since then. A lot from Eric W on you tube.
These heads are coming off my 355 and going on the 406 where the extra flow will get better utilized.
I can still taste the cast iron from potting heads 40 plus years ago. Aluminum was much better to work with. And I used to put brass tubes in so I could s.ooth out that pushrod pinch. Nice pictures. Now you can buy what you need for the most part instead of make it.
You young guys really missed out.
I used to put brass tubes in so I could s.ooth out that pushrod pinch..
Stainless steel tubing works better, as it is available at only .010" wall thickness and still rigid enough to be lightly press fitted, and then also resisted being cut better in the porting endeavor.
Race Cylinder Head Porting
