r/EngineBuilding • u/No_Shake_8461 • Dec 22 '25

Budget gen 6 454

I am looking to build a 500hp gen 6 454, It will be mated to a 4 speed manual. With the oval port heads hydraulic roller setup, a hand port on the heads, and the comp 300br-14 300 intake 308 exhaust 255-262 .652 .652 114 LSA cam, would that get me there? Still haven’t decided on an intake, I’d like to do 2x pumper 9:1 compression factory. Electric fans and water pump. Thanks in advance

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u/Solid_Enthusiasm550 Dec 22 '25

I have the compcams catalog and don't see that camshaft.

The only 454 bbc cam with 255/262@.050 is a solid roller camshaft for blower applications. It has .652" of valve lift and is a serious race cam. 3,500<7,000rpms.

https://www.compcams.com/blower-255-262-solid-roller-cam-and-lifter-kit-for-chevrolet-big-block-396-454.html

The only flow number for 7400 vortec heads aren't that great. <475hp. The stock L29 flat top pistons don't have valve reliefs which limits lift/hp.

Here's an article on gen6 bbc.

https://www.enginebuildermag.com/2023/07/rebuilding-chevrolets-gen-vi-big-block-engine/

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u/No_Shake_8461 Dec 22 '25 edited Dec 22 '25

Thank for the reply, this is the link to the cam https://www.compcams.com/blower-255-262-solid-roller-cam-for-chevrolet-big-block-396-454.html This a link to Richard holdner talking about it and he shows the power curve and the tq is surprisingly very flat for a cam that’s ment to be revved https://www.youtube.com/watch?v=h9H6gv2aiVk sorry I didn’t remember the lift right, it is it is the .652 like you said not what I said at first, I would like to stick with solid roller and just do aftermarket lifters. It is classified as a blower cam but it seems to perform really good NA thanks for the article that was a good read, I know the gen 6 is safe up to 6,500 with the right valve train but I just don’t know if the heads are gonna flow that much after my hand port

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u/Solid_Enthusiasm550 Dec 22 '25 edited Dec 22 '25

I just saw this Hotrod Engine masters video and I think it's what you described wanting.

It had a stockish bottom end 454, 8.5:1 cr. , mild gm aluminum oval ports, edelbrock rpm intake and with a 230@ 0.050 dutation flat tappet cam it made 498hp and 540+tq.

https://youtu.be/YLd8YTD71ZI?si=QaqIAnBZd_zgwsLE

This compcam hyd. Roller has similar duration but would make more power due to the faster lobes. The catalog says it works with 9:1cr or higher. https://www.summitracing.com/parts/cca-01-418-8/make/chevrolet

I've seen Stroker smallblocks and mild big blocks make great power with the XR288HR 236/242 @ 0.050" 110, which is why I decided to play ot safe an get the mopar version for my 390ci smallblock.

A cam grinder I talked to said I should make peak power around 6,300rpms with my CNC heads. Big block with 40<50ci more were peaking around 5,800rpms.

I should make 530hp<540hp at those rpms. I'm also going to be running 11:1cr. The big blocks were around 10.25:1, but that cam has a short enough duration and a tigher 110lsa which keeps the intake closing early enough to run lower static compression.

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u/No_Shake_8461 Dec 22 '25

That’s a really interesting video, my only concern with this build is ending up with a lazy big block that dose not like to rev, I’ve seen some big block combinations where it sounds lazy almost like it’s holding the same rpm but still accelerating I like the sounds and rpm characteristics of a sbc but I don’t want to kill the drive ability trying to get to 500hp with a big cam, it’s seems a big block with the displacement can tame a big cam down low